[Drakelist] Tr7
Hi looking for sumone in uk kent how nows tr7 . As my one is looking for sum tlc ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7/R7 Service Kit has been sold. Thanks.
Thanks to all who replied. Enjoy those Drakes! ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Tr7. Audio
On Fri, 11 Sep 2015 09:55:25 -0500, DW. Anderson wrote: >Greetings to the group, thanks to you fixed last issue with the tr7, have new >issue , when I tune the radio in am, go to switch to CW, rtty, ssb lose audio >, meter is showing signals coming in and in transmit showing power out, but to >audio, any thoughts ? Sounds like you are losing the BFO. Since it affects both CW and SSB I would suspect the signal path between pin 40 of the PBT/Ref board and pin 40 of the 2nd IF/Audio board. Probably one of those pesky Molex connectors. Often just pulling the board up and re-seating will clear problems like this, but a little dab of DeOxit on all the pins wouldn't hurt. Don't spray, it will go everywhere that you don't want it. 73 -Jim NU0C -- Theres something out of place lets go and poke it with a stick. The Doctor, "Amys Choice" ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Tr7. Audio
Greetings to the group, thanks to you fixed last issue with the tr7, have new issue , when I tune the radio in am, go to switch to CW, rtty, ssb lose audio , meter is showing signals coming in and in transmit showing power out, but to audio, any thoughts ? Sent from my iPhone. KC9WKP ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7's for Sale
I hope I'm doing this right. I have 2 TR7's with power supply. PS7. The best is to contact me if your interested and they are not priced at collectors level. Send me an email with your phone number that way it is easier to tell you what each one has Thanks. Ande Anderson VE6WT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 PS7
I have an extra TR7 PS7 combo I would like to sell. Both units function fine. Prefer pickup but will ship; $300.00 (plus shipping from Tallahassee, FL.) Good DX, W4DL Mike ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Driver Stage on PA Board Questions
Yes it needs to be connected. It is not a fuse but a test point for driver bias. 73, Gary http://home.roadrunner.com/~w8pu R-4A T4-X R-4B T4-XB R-4C T4-XC MS-4 L-4B RCS-4 2A 2B 2C 2NT 2CQ 2AS 4-LF TR-4 TR-4C TR-4CW/RIT RV-4C MC-4 TR-7 RV-7 CW-75 MS-7 WH-7 W-4 WV-4 MN-2700 MN-4C MN-2000 UV-3 PS-3 TR-22C TR-33C AA-10 AC-10 MMK-22 TR-6 PRN1000 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Driver Stage on PA Board Questions
Thanks Jim Oh boy, yes T2302. I don't know why I said 2802, I guess that's what happens when your old, tired and frustrated. I figured that's where my 13.6 volts was going by following the schematic but wanted to confirm it before I started dissecting T2303 to get to T2302. I wonder if I could put a new lead to T2302 from the bottom side of the card? At least that way maybe I could test it and see if I have to rewind T2302 before removing T2303. I'll have to study it and see how difficult this is going to be either way. If someone has a good PA board they want to sell me I'm ready to buy one. Steve w7jsc -- From: Jim Shorney jshor...@inebraska.com Sent: Friday, March 21, 2014 8:14 PM To: J. Steven Cochrane w7...@msn.com; drakelist drakelist@zerobeat.net Subject: Re: [Drakelist] TR7 Driver Stage on PA Board Questions I assume you are referring to T2302, there are no 28xx parts on the PA deck. I suspect what you are seeing is one of the lead wires from T2302, which is part of the RF filtering system for the collector voltage to the drivers. It looks to be bifilar wound, so yes, a break in the common lead would kill 13.6 to both of the drivers. It looks like to get to it you would need to remove T2303. Not an easy task, but do-able. I don't have one in front of me, just looking at SM pictures right now. Once you can get to it, it shouldn't be a big deal to either patch the broken lead or re-wind it. 73 -Jim NU0C On Fri, 21 Mar 2014 16:21:32 -0600, J. Steven Cochrane wrote: I have two TR7 questions: 1. There is a VERY fine wire, like fuse wire, that runs next to T2802 toroid (side closest to the final amp stage), it is broken. Could that be why I don't have 13.6 volts going to the Driver Transistors (there is 13.6 volts at the Test Jumper for the Bias Measurement)? The toroid doesn't look all that good either, but neither does the one in my good TR7. 2. Does anyone know of an easy way to replace that wire and T2802 if necessary? If anyone has a working PA board they would like to sell I'm interested. Steve J. Steven Cochrane W7JSC -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Driver Stage on PA Board Questions
I assume you are referring to T2302, there are no 28xx parts on the PA deck. I suspect what you are seeing is one of the lead wires from T2302, which is part of the RF filtering system for the collector voltage to the drivers. It looks to be bifilar wound, so yes, a break in the common lead would kill 13.6 to both of the drivers. It looks like to get to it you would need to remove T2303. Not an easy task, but do-able. I don't have one in front of me, just looking at SM pictures right now. Once you can get to it, it shouldn't be a big deal to either patch the broken lead or re-wind it. 73 -Jim NU0C On Fri, 21 Mar 2014 16:21:32 -0600, J. Steven Cochrane wrote: I have two TR7 questions: 1. There is a VERY fine wire, like fuse wire, that runs next to T2802 toroid (side closest to the final amp stage), it is broken. Could that be why I don't have 13.6 volts going to the Driver Transistors (there is 13.6 volts at the Test Jumper for the Bias Measurement)? The toroid doesn't look all that good either, but neither does the one in my good TR7. 2. Does anyone know of an easy way to replace that wire and T2802 if necessary? If anyone has a working PA board they would like to sell I'm interested. Steve J. Steven Cochrane W7JSC -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 Driver Stage on PA Board Questions
I have two TR7 questions: 1. There is a VERY fine wire, like fuse wire, that runs next to T2802 toroid (side closest to the final amp stage), it is broken. Could that be why I don't have 13.6 volts going to the Driver Transistors (there is 13.6 volts at the Test Jumper for the Bias Measurement)? The toroid doesn't look all that good either, but neither does the one in my good TR7. 2. Does anyone know of an easy way to replace that wire and T2802 if necessary? If anyone has a working PA board they would like to sell I'm interested. Steve J. Steven Cochrane W7JSC ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Transmit Intermittent Power Problem
At this point it looks like CR1501 is the culprit, but I won't know for sure until I replace it and do some more testing. Steve w7jsc -- From: Jim Shorney jshor...@inebraska.com Sent: Tuesday, March 04, 2014 11:27 PM To: drakelist@zerobeat.net Subject: Re: [Drakelist] TR7 Transmit Intermittent Power Problem I was getting strange output variations when I had leaky driver transistors on the PA deck. Easy to check, the base voltage on the drivers should be zero in RX. If it's anywhere near 0.6V, there's a problem. When I lifted the base leads, one of them floated right up to 13.8V. Be careful not to short the base to the collector when you measure, you will destroy the device instantly. A similar problem that I have now is a dirty bandswitch. Depending on the band, I often have to wiggle and jiggle it to get proper output. It's due to hit the bench soon for another project, so I'm going to DeOxit the band switch at that time. 73 -Jim NU0C On Tue, 4 Mar 2014 07:35:19 -0700, J. Steven Cochrane wrote: I have run out of ideas. One of my TR7s has intermittent output power problems. Sometimes there is no output, sometimes there is 40 to 10 watts output depending on band and sometimes there is full output. When I change bands there usually is no output as well as low receive sensitivity. When I tap the PTT button on the mic the receive comes up to normal and I usually get 40 to 20 watts (CW) out on transmit. Sometimes when I push on the High Pass Filter section boards I get full output, sometimes I don't. Sometimes I get full output when talking into the mic (with the PTT button depressed of course) and not doing anything else. I searched the archives with little luck. What I have done so far: 1. Pulled all the boards and reseated them (some numerous times). 2. Loosened and tightened all screws I could get to, externally and internally. 3. Cleaned all switches at least twice. 4. Pulled the power supply board and replaced C2108. 5. Readjusted 10 volt supply and checked Fixed pass band adjustment (all good). 6. Checked 40, 13.695, and 8.05 Oscillators (all Good) 7. Attempted to do Transmitter Alignment and ALC Adjustment but with only intermittent power output it was hit-and-miss at best. 8. Disconnected Diode CR1402 on the High Pass Filter Board (no change). 9. Checked 10 Volt transmit voltage on Parent Board when in transmit (right on 10 Volts). 10. Changed out the T/R relay twice ( no change). 11. Changed cables and dummy load (no change). 12. Cussed a lot (didn't help). Any ideas where to go next other than crazy? Steve W7JSC ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist -- There's something out of place - let's go and poke it with a stick. - The Doctor, Amy's Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 - CW and ALC level
I did not replace any of the other caps at that time, although with the age of these radios it probably would not be a bad idea. The thing with the cap on the PS board is that it can cause some strange things to happen when it starts to fail, which can include unintentional out-of-band emissions. I recommend that you use caps rated for 105C temperature. Not because it gets that hot in there, but rather that they are more robust devices and should in theory last longer. 73 -Jim NU0C On Wed, 5 Mar 2014 22:25:03 +, Lehman, Rex wrote: Hi Jim Seen this post on replacing the 220 UF cap on PS bd for the DC to DC converter and seen your older messages where you said you recap your TR-7. Did you just recap the PS board or did you replace every electrolytic cap in the TR-7. Just curious as I have one of mine apart and did the PS bd thinking maybe its worth it to do all of them. Thanks WB8TDG Rex Lehman Office +1.937.490.4474 rex.leh...@meas-spec.com -Original Message- From: Drakelist [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Jim Shorney Sent: Monday, March 03, 2014 11:34 PM To: drakelist@zerobeat.net; Mark Nace Subject: Re: [Drakelist] TR7 - CW and ALC level ALL of the screws for the card cage cover need to be there, and snug. Don't overtighten, they will strip the chassis. The +10V and the frequency alignments are the most critical. You probably won't need to touch the RF/IF cans or anything underneath the DR-7 except maybe the carrier balance. The RIT center pot should be accessible from the bottom through a hole in the parent board. Replace the filter capacitor on the DC-DC converter (power supply) board. Don't ask why, just do it. It is worthwhile to replace the fixed passband pots and the +10 pot with 10-turn trimpots as long as you are at it. Unless you have doubts about the calibration, I wouldn't touch the wattmeter and SWR balance adjustments. Judgement call... AGC alignment should go by the book. If you will be doing CW, give Floyd's article a read. It's spot on: http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_Key_Clicks.pdf There are some quick and dirty tech notes from Drake's service department here: http://www.zerobeat.net/drakelist/tr7bookalign.html If you have any questions, ask. 73 -Jim NU0C On Mon, 3 Mar 2014 19:36:27 -0800 (PST), Mark Nace wrote: I bought my new TR7 28 years ago (as my first rig ever) and am about to do do my first alignment check. I have re-seated the boards once, and that cured most of the ills. I have a late-model TR7, along with the maint manual. If I do it by the book, is there anything I should watch out for ?? Mark N5KAE -- The universe we're in will reach absolute zero in three hours. Safe is relative. - Idris, The Doctor's Wife ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist -- Theres something out of place lets go and poke it with a stick. The Doctor, Amys Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 Transmit Intermittent Power Problem
I have run out of ideas. One of my TR7s has intermittent output power problems. Sometimes there is no output, sometimes there is 40 to 10 watts output depending on band and sometimes there is full output. When I change bands there usually is no output as well as low receive sensitivity. When I tap the PTT button on the mic the receive comes up to normal and I usually get 40 to 20 watts (CW) out on transmit. Sometimes when I push on the High Pass Filter section boards I get full output, sometimes I don't. Sometimes I get full output when talking into the mic (with the PTT button depressed of course) and not doing anything else. I searched the archives with little luck. What I have done so far: 1. Pulled all the boards and reseated them (some numerous times). 2. Loosened and tightened all screws I could get to, externally and internally. 3. Cleaned all switches at least twice. 4. Pulled the power supply board and replaced C2108. 5. Readjusted 10 volt supply and checked Fixed pass band adjustment (all good). 6. Checked 40, 13.695, and 8.05 Oscillators (all Good) 7. Attempted to do Transmitter Alignment and ALC Adjustment but with only intermittent power output it was hit-and-miss at best. 8. Disconnected Diode CR1402 on the High Pass Filter Board (no change). 9. Checked 10 Volt transmit voltage on Parent Board when in transmit (right on 10 Volts). 10. Changed out the T/R relay twice ( no change). 11. Changed cables and dummy load (no change). 12. Cussed a lot (didn't help). Any ideas where to go next other than crazy? Steve W7JSC ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Transmit Intermittent Power Problem
I was getting strange output variations when I had leaky driver transistors on the PA deck. Easy to check, the base voltage on the drivers should be zero in RX. If it's anywhere near 0.6V, there's a problem. When I lifted the base leads, one of them floated right up to 13.8V. Be careful not to short the base to the collector when you measure, you will destroy the device instantly. A similar problem that I have now is a dirty bandswitch. Depending on the band, I often have to wiggle and jiggle it to get proper output. It's due to hit the bench soon for another project, so I'm going to DeOxit the band switch at that time. 73 -Jim NU0C On Tue, 4 Mar 2014 07:35:19 -0700, J. Steven Cochrane wrote: I have run out of ideas. One of my TR7s has intermittent output power problems. Sometimes there is no output, sometimes there is 40 to 10 watts output depending on band and sometimes there is full output. When I change bands there usually is no output as well as low receive sensitivity. When I tap the PTT button on the mic the receive comes up to normal and I usually get 40 to 20 watts (CW) out on transmit. Sometimes when I push on the High Pass Filter section boards I get full output, sometimes I don't. Sometimes I get full output when talking into the mic (with the PTT button depressed of course) and not doing anything else. I searched the archives with little luck. What I have done so far: 1. Pulled all the boards and reseated them (some numerous times). 2. Loosened and tightened all screws I could get to, externally and internally. 3. Cleaned all switches at least twice. 4. Pulled the power supply board and replaced C2108. 5. Readjusted 10 volt supply and checked Fixed pass band adjustment (all good). 6. Checked 40, 13.695, and 8.05 Oscillators (all Good) 7. Attempted to do Transmitter Alignment and ALC Adjustment but with only intermittent power output it was hit-and-miss at best. 8. Disconnected Diode CR1402 on the High Pass Filter Board (no change). 9. Checked 10 Volt transmit voltage on Parent Board when in transmit (right on 10 Volts). 10. Changed out the T/R relay twice ( no change). 11. Changed cables and dummy load (no change). 12. Cussed a lot (didn't help). Any ideas where to go next other than crazy? Steve W7JSC ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist -- Theres something out of place lets go and poke it with a stick. The Doctor, Amys Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 - CW and ALC level
In the Tweak my peak thread, NU0C said this: /On CW, definitely operate below the ALC level. The quality of the transmit signal starts to degrade when you go into ALC.// / I decided to take a look at that today, using my Orion II and NaP3 panadapter to examine the TR7 output spectrum as the ALC was varied. My TR7 is setup to put out 100W at the point on the carrier level control just before where the the LED comes on (on 20M). The TR7 was operated into a dummy load and the Orion had no antenna connected and 18 dB of attenuation dialed in so the TR7 signal didn't overdrive the panadapter range. I watched the panadapter display as I rotated the carrier level control from that point to full clockwise. The ALC LED came on at about the 1 o'clock position. The power maxed out at 115 watts. I saw no change in the spurs I saw at all over that range. The strongest spurs were 60 dB down from the carrier. So, it appears, at least on my TR7, that there is no degradation in the CW signal (looking 40 KHz in each direction from the carrier) that is related to ALC action. Maybe if my TR7 were adjusted for maximum output, other factors might cause increased distortion that would appear to be related to the ALC level (but might not be). I checked again on 10M CW (where my max output is set to 80W) and found the same thing to be true (but spurs were 67 dB down). 73, Floyd - K8AC ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 - CW and ALC level
Thanks for the comments, Floyd. I have noted with my TR-7 that if I get into ALC on CW the sidetone starts to sound rough and a scope on the carrier shows what looks like some AM fuzz starting to show up on the signal. I was never sure if this was a problem or not as the owner's manual does state that advancing the carrier control past the point where the light comes on may result in undesirable keying characteristics. I've seen a couple of other TR-7s do something similar. I may look into it at some point, but as long as I stay below ALC illumination everything looks fine. Using even a little ALC to level the carrier on transmit doesn't sound like a good idea anyay. 73 -Jim NU0C On Mon, 03 Mar 2014 16:11:24 -0500, Floyd Sense wrote: In the Tweak my peak thread, NU0C said this: /On CW, definitely operate below the ALC level. The quality of the transmit signal starts to degrade when you go into ALC.// / I decided to take a look at that today, using my Orion II and NaP3 panadapter to examine the TR7 output spectrum as the ALC was varied. My TR7 is setup to put out 100W at the point on the carrier level control just before where the the LED comes on (on 20M). The TR7 was operated into a dummy load and the Orion had no antenna connected and 18 dB of attenuation dialed in so the TR7 signal didn't overdrive the panadapter range. I watched the panadapter display as I rotated the carrier level control from that point to full clockwise. The ALC LED came on at about the 1 o'clock position. The power maxed out at 115 watts. I saw no change in the spurs I saw at all over that range. The strongest spurs were 60 dB down from the carrier. So, it appears, at least on my TR7, that there is no degradation in the CW signal (looking 40 KHz in each direction from the carrier) that is related to ALC action. Maybe if my TR7 were adjusted for maximum output, other factors might cause increased distortion that would appear to be related to the ALC level (but might not be). I checked again on 10M CW (where my max output is set to 80W) and found the same thing to be true (but spurs were 67 dB down). 73, Floyd - K8AC -- Theres something out of place lets go and poke it with a stick. The Doctor, Amys Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 - CW and ALC level
Interesting. I'll bet that no two TR7s will behave exactly the same in this respect since there are several adjustments involved, and they've probably all been adjusted differently after all these years. I haven't seen that fuzzy signal problem, but as I said I have my output cranked back a ways. 73, Floyd On 3/3/2014 9:57 PM, Jim Shorney wrote: Thanks for the comments, Floyd. I have noted with my TR-7 that if I get into ALC on CW the sidetone starts to sound rough and a scope on the carrier shows what looks like some AM fuzz starting to show up on the signal. I was never sure if this was a problem or not as the owner's manual does state that advancing the carrier control past the point where the light comes on may result in undesirable keying characteristics. I've seen a couple of other TR-7s do something similar. I may look into it at some point, but as long as I stay below ALC illumination everything looks fine. Using even a little ALC to level the carrier on transmit doesn't sound like a good idea anyay. 73 -Jim NU0C On Mon, 03 Mar 2014 16:11:24 -0500, Floyd Sense wrote: In the Tweak my peak thread, NU0C said this: /On CW, definitely operate below the ALC level. The quality of the transmit signal starts to degrade when you go into ALC.// / I decided to take a look at that today, using my Orion II and NaP3 panadapter to examine the TR7 output spectrum as the ALC was varied. My TR7 is setup to put out 100W at the point on the carrier level control just before where the the LED comes on (on 20M). The TR7 was operated into a dummy load and the Orion had no antenna connected and 18 dB of attenuation dialed in so the TR7 signal didn't overdrive the panadapter range. I watched the panadapter display as I rotated the carrier level control from that point to full clockwise. The ALC LED came on at about the 1 o'clock position. The power maxed out at 115 watts. I saw no change in the spurs I saw at all over that range. The strongest spurs were 60 dB down from the carrier. So, it appears, at least on my TR7, that there is no degradation in the CW signal (looking 40 KHz in each direction from the carrier) that is related to ALC action. Maybe if my TR7 were adjusted for maximum output, other factors might cause increased distortion that would appear to be related to the ALC level (but might not be). I checked again on 10M CW (where my max output is set to 80W) and found the same thing to be true (but spurs were 67 dB down). 73, Floyd - K8AC -- “There’s something out of place – let’s go and poke it with a stick.” – The Doctor, Amy’s Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 - CW and ALC level
I bought my new TR7 28 years ago (as my first rig ever) and am about to do do my first alignment check. I have re-seated the boards once, and that cured most of the ills. I have a late-model TR7, along with the maint manual. If I do it by the book, is there anything I should watch out for ??br/Tnxbr/Markbr/N5KAEa href=https://overview.mail.yahoo.com?.src=iOS;br/br/Sent from Yahoo Mail for iPhone/a___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 - CW and ALC level
I'm not convinced that it's related to the output level. The rough sidetone suggests to me that the problem is somewhere in the 2nd IF/Audio board. The sidetone is generated there by feeding the CW oscillator into the RX IF and letting the product detector do the work. Coincidentally, the ALC control also takes place on this board. It may be a decoupling issue. A good starting point might be to re-cap all of the electrolytic decoupling caps on the board. They are all positively ancient in dog years. Just speculation at this point... 73 -Jim NU0C On Mon, 03 Mar 2014 22:20:36 -0500, Floyd Sense wrote: Interesting. I'll bet that no two TR7s will behave exactly the same in this respect since there are several adjustments involved, and they've probably all been adjusted differently after all these years. I haven't seen that fuzzy signal problem, but as I said I have my output cranked back a ways. 73, Floyd On 3/3/2014 9:57 PM, Jim Shorney wrote: Thanks for the comments, Floyd. I have noted with my TR-7 that if I get into ALC on CW the sidetone starts to sound rough and a scope on the carrier shows what looks like some AM fuzz starting to show up on the signal. I was never sure if this was a problem or not as the owner's manual does state that advancing the carrier control past the point where the light comes on may result in undesirable keying characteristics. I've seen a couple of other TR-7s do something similar. I may look into it at some point, but as long as I stay below ALC illumination everything looks fine. Using even a little ALC to level the carrier on transmit doesn't sound like a good idea anyay. 73 -Jim NU0C On Mon, 03 Mar 2014 16:11:24 -0500, Floyd Sense wrote: In the Tweak my peak thread, NU0C said this: /On CW, definitely operate below the ALC level. The quality of the transmit signal starts to degrade when you go into ALC.// / I decided to take a look at that today, using my Orion II and NaP3 panadapter to examine the TR7 output spectrum as the ALC was varied. My TR7 is setup to put out 100W at the point on the carrier level control just before where the the LED comes on (on 20M). The TR7 was operated into a dummy load and the Orion had no antenna connected and 18 dB of attenuation dialed in so the TR7 signal didn't overdrive the panadapter range. I watched the panadapter display as I rotated the carrier level control from that point to full clockwise. The ALC LED came on at about the 1 o'clock position. The power maxed out at 115 watts. I saw no change in the spurs I saw at all over that range. The strongest spurs were 60 dB down from the carrier. So, it appears, at least on my TR7, that there is no degradation in the CW signal (looking 40 KHz in each direction from the carrier) that is related to ALC action. Maybe if my TR7 were adjusted for maximum output, other factors might cause increased distortion that would appear to be related to the ALC level (but might not be). I checked again on 10M CW (where my max output is set to 80W) and found the same thing to be true (but spurs were 67 dB down). 73, Floyd - K8AC -- Theres something out of place lets go and poke it with a stick. The Doctor, Amys Choice -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 - CW and ALC level
ALL of the screws for the card cage cover need to be there, and snug. Don't overtighten, they will strip the chassis. The +10V and the frequency alignments are the most critical. You probably won't need to touch the RF/IF cans or anything underneath the DR-7 except maybe the carrier balance. The RIT center pot should be accessible from the bottom through a hole in the parent board. Replace the filter capacitor on the DC-DC converter (power supply) board. Don't ask why, just do it. It is worthwhile to replace the fixed passband pots and the +10 pot with 10-turn trimpots as long as you are at it. Unless you have doubts about the calibration, I wouldn't touch the wattmeter and SWR balance adjustments. Judgement call... AGC alignment should go by the book. If you will be doing CW, give Floyd's article a read. It's spot on: http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_Key_Clicks.pdf There are some quick and dirty tech notes from Drake's service department here: http://www.zerobeat.net/drakelist/tr7bookalign.html If you have any questions, ask. 73 -Jim NU0C On Mon, 3 Mar 2014 19:36:27 -0800 (PST), Mark Nace wrote: I bought my new TR7 28 years ago (as my first rig ever) and am about to do do my first alignment check. I have re-seated the boards once, and that cured most of the ills. I have a late-model TR7, along with the maint manual. If I do it by the book, is there anything I should watch out for ?? Mark N5KAE -- The universe we're in will reach absolute zero in three hours. Safe is relative. - Idris, The Doctor's Wife ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 on CW.
The XYL gave me a TR7 for a Valentine's Day gift the other day.I have been getting used to it and have been making CW contacts on 40m with it. Questions that I have are: Where is there an adjustment for Side Tone Volume and Side Tone Pitch? I figured if there are such adjustments they may well be on a PC module as I cannot find any reference to them in my manual. Many more questions will arise I am certain but the rig works well considering its' age. 73 from Lane de n8aft___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 on CW.
Sidetone volume is the main front panel volume control. Frequency is C1136 on the 2nd IF board, accessable through the rear panel key jack. Note that it affects your transmit offset frequency and should be set to 800Hz. On February 17, 2014 at 4:34 PM lane denune lanerda...@yahoo.com wrote: The XYL gave me a TR7 for a Valentine's Day gift the other day.I have been getting used to it and have been making CW contacts on 40m with it. Questions that I have are: Where is there an adjustment for Side Tone Volume and Side Tone Pitch? I figured if there are such adjustments they may well be on a PC module as I cannot find any reference to them in my manual. Many more questions will arise I am certain but the rig works well considering its' age. 73 from Lane de n8aft___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937 825 5032 Amateur Radio G8IFF W8IFF (was KC8NHF 9H3GN), e-mail ni...@ngunn.net www http://www.ngunn.net Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP Club International #385, Dayton ARA #2128, AMSAT-NA LM-1691, MKARS, GCARES, EAA382. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 on CW.
And as long as we are on the subject, there is an excellent article on key clicks int he TR-7 by Floyd, K8AC, at: http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_Key_Clicks.pdf Lane, I highly recommend that you get a copy of the excellent TR-7 service manual. There are usable free PDF copise floating around the internet, and high quality repros can be purchased of eBay or direct from various sellers. It is indispensable. 73 -Jim NU0C On Mon, 17 Feb 2014 18:46:56 -0500 (EST), Nigel A. Gunn G8IFF/W8IFF wrote: Sidetone volume is the main front panel volume control. Frequency is C1136 on the 2nd IF board, accessable through the rear panel key jack. Note that it affects your transmit offset frequency and should be set to 800Hz. On February 17, 2014 at 4:34 PM lane denune lanerda...@yahoo.com wrote:  The XYL gave me a TR7 for a Valentine's Day gift the other day.I have been getting used to it and have been making CW contacts on 40m with it. Questions that I have are: Where is there an adjustment for Side Tone Volume and Side Tone Pitch? I figured if there are such adjustments they may well be on a PC module as I cannot find any reference to them in my manual.  Many more questions will arise I am certain but the rig works well considering its' age. 73 from Lane de n8aft___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist -- The universe we're in will reach absolute zero in three hours. Safe is relative. - Idris, The Doctor's Wife ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 high pitched wine in audio
Jim, Great leads. Thank you. It sounds to the ear like the problem may be exactly what you are suggesting. I’ve been sorting out a few issues with the rig and only two remain – the whine, and my RIT is way off. I pulled DR7 last night for access to the RIT alignment pot, and while I don’t yet have an extender set, I took a few blind shots at getting the RIT at least into a useable range. No luck. Seems to be out of range of the pot, suggesting a broader alignment issue. I rarely use RIT, so this problem can be addressed later. The whine is more of an issue. I really like the radio and have been enjoying 60 mtr. QSO’s with my brother, Guy, in Memphis, WD5ACP; I’m near New Orleans. My brother and I have been hamming since the late 70’s and my recent Drake adventures have motivated him. He’s now awaiting receipt of a TR-7. Once these minor issues are dealt with my rig will be 100%. The only real problem I had with the rig was transmitter instability, which cleared with a cleaning of the ALC pot and a pot on the pre-driver board. I’ve been comparing the receive performance to a Ten Tec Pegasus, known to have a great receiver. The TR7 holds its own. After this I’m moving on to get my TR4CW into top shape. Thanks again. From: Jim Shorney jshor...@inebraska.com To: drakelist@zerobeat.net drakelist@zerobeat.net Sent: Monday, January 20, 2014 10:30 PM Subject: Re: [Drakelist] TR7 high pitched wine in audio The first thing I would look at is the filter cap on the DC-DC converter (Power Supply) board in the front right corner of the radio. This capacitor is IMO an always replace for any TR-7. Strange things can happen when it starts to fail, and on a rig that old it most likely is. Replace with a part specified for 105C temperature if possible. There was also an engineering change to add a 470uF axial cap to the +10v rail. This was added by Drake service to any radio that did not have it. Look for it on the bottom side of the chassis, between pins 10 (+10V) and pin 3 (ground) of the DC-DC coverter board connector. 73 -Jim NU0C On Mon, 20 Jan 2014 20:04:55 -0800 (PST), Leon Zebrick wrote: Picked up an early Sr# TR7. It's fine except for a high pitched noise in the audio. It's continuous and not affected by volume control. Not on transmit signal. It's not loud, but noticeable and annoying in headphones. Sounds like one of the oscillators is getting into the audio circuit. Any decoupling mods or improvements related to this? Sr no. Is in the 600 range. Wonder if this is something Drake eventually improved on. Or do I have a problem? Thanks. -- “There’s something out of place – let’s go and poke it with a stick.” – The Doctor, Amy’s Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 high pitched wine in audio
Leon, Replace the 1000 ufd capacitor on the right forward edge of the DR-7 board. Its C9026 on the schematic. I have had this happen to one of my TR-7’s. 73, Gary http://home.roadrunner.com/~w8pu R-4A T4-X R-4B T4-XB R-4C T4-XC MS-4 L-4B RCS-4 2A 2B 2C 2NT 2CQ 2AS 4-LF TR-4 TR-4C TR-4CW/RIT RV-4C MC-4 TR-7 RV-7 CW-75 MS-7 WH-7 W-4 WV-4 MN-2700 MN-4C MN-2000 UV-3 PS-3 TR-22C TR-33C AA-10 AC-10 MMK-22 TR-6 PRN1000 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 high pitched wine in audio
Leon, A properly working TR-7 is a joy to operate. Replace the cap Gary Poland recommended as well; although I haven't had a bad one, it can't hurt either. You may indeed have an alignment problem with the RIT. A touch-up of the frequency alignments should be done regardless. If that doesn't fix it, look at the analog switch IC on the parent board. There should be a hole in the parent board to access the RIT adjustment pot from the bottom. The very oldest may not have had it. Plan on doing a fixed passband alignment any time you remove the DR-7 or do anything else around that front right corner. Those pots are easy to bump without even realising it. There's lots of info on the internet. Google can be your friend. Get the Drakemod document, it's a good read. Ignore all advice to reverse the direction of the fan from what Drake intended, it really does work best that way. 73 -Jim NU0C On Tue, 21 Jan 2014 06:47:53 -0800 (PST), Leon Zebrick wrote: Jim, Great leads. Thank you. It sounds to the ear like the problem may be exactly what you are suggesting. Iâve been sorting out a few issues with the rig and only two remain â the whine, and my RIT is way off. I pulled DR7 last night for access to the RIT alignment pot, and while I donât yet have an extender set, I took a few blind shots at getting the RIT at least into a useable range. No luck. Seems to be out of range of the pot, suggesting a broader alignment issue. I rarely use RIT, so this problem can be addressed later. The whine is more of an issue. I really like the radio and have been enjoying 60 mtr. QSOâs with my brother, Guy, in Memphis, WD5ACP; Iâm near New Orleans. My brother and I have been hamming since the late 70âs and my recent Drake adventures have motivated him. Heâs now awaiting receipt of a TR-7. Once these minor issues are dealt with my rig will be 100%. The only real problem I had with the rig was transmitter instability, which cleared with a cleaning of the ALC pot and a pot on the pre-driver board. Iâve been comparing the receive performance to a Ten Tec Pegasus, known to have a great receiver. The TR7 holds its own. After this Iâm moving on to get my TR4CW into top shape. Thanks again. -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 high pitched wine in audio
Picked up an early Sr# TR7. It's fine except for a high pitched noise in the audio. It's continuous and not affected by volume control. Not on transmit signal. It's not loud, but noticeable and annoying in headphones. Sounds like one of the oscillators is getting into the audio circuit. Any decoupling mods or improvements related to this? Sr no. Is in the 600 range. Wonder if this is something Drake eventually improved on. Or do I have a problem? Thanks. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 high pitched wine in audio
The first thing I would look at is the filter cap on the DC-DC converter (Power Supply) board in the front right corner of the radio. This capacitor is IMO an always replace for any TR-7. Strange things can happen when it starts to fail, and on a rig that old it most likely is. Replace with a part specified for 105C temperature if possible. There was also an engineering change to add a 470uF axial cap to the +10v rail. This was added by Drake service to any radio that did not have it. Look for it on the bottom side of the chassis, between pins 10 (+10V) and pin 3 (ground) of the DC-DC coverter board connector. 73 -Jim NU0C On Mon, 20 Jan 2014 20:04:55 -0800 (PST), Leon Zebrick wrote: Picked up an early Sr# TR7. It's fine except for a high pitched noise in the audio. It's continuous and not affected by volume control. Not on transmit signal. It's not loud, but noticeable and annoying in headphones. Sounds like one of the oscillators is getting into the audio circuit. Any decoupling mods or improvements related to this? Sr no. Is in the 600 range. Wonder if this is something Drake eventually improved on. Or do I have a problem? Thanks. -- Theres something out of place lets go and poke it with a stick. The Doctor, Amys Choice ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 station for sale - W3BH
I'm selling my TR7 station. Details are as follows: Serial Number 4298 PS7/FA-7/NB-7/AUX-7/MS-7 SL-4000 SL-6000 SL-1800 SL-500 Also transmits and receives all WRAC bands Receives 0 - 500, but weakly as expected Original Blue Drake Manual labeled TR7A Non-smoking Very lightly used No mic included Issues: TR7 - Light scratches on top of case, but looks solid black from 2 feet front view Used very little over 15 years I've had it. I was working in Egypt for most of that time and it was boxed up at home. Case screws underneath are not original, but fit properly. One screw on bottom holding case on was broken off. It can be extracted and replaced. Speaker case is slightly bent at top back. Probably can be straightened. Front panel and controls are perfect. Over two seasons on 160 CW, I worked 70 countries running barefoot with an inverted-L Reason for selling - Retired and need money for receiver projects. Shipping at cost. It will take at least three boxes for safety and security. Estimate $100 Could meet half way if reasonable from Pittsburgh. Traveling to Boston by car from 29th to 4th and could drop off if you are near the path Will never go on eBay. If no interest here I will put it on QTH and QRZ. Can meet you on the air from 160 to 10 if you want to hear what it sound like. Pictures are here - https://plus.google.com/photos/103146183216051782359/albums/5843761461331631601 Price: $650 plus shipping Thanks, Jim W3BH Saxonburg, PA 16056 About 20 miles NNE of Pittsburgh ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 station for sale - W3BH
Sale of the TR7 station is pending. Thanks, Jim Sorenson W3BH On Thu, May 23, 2013 at 6:01 PM, Jim Sorenson kjsoren...@gmail.com wrote: I'm selling my TR7 station. Details are as follows: Serial Number 4298 PS7/FA-7/NB-7/AUX-7/MS-7 SL-4000 SL-6000 SL-1800 SL-500 Also transmits and receives all WRAC bands Receives 0 - 500, but weakly as expected Original Blue Drake Manual labeled TR7A Non-smoking Very lightly used No mic included Issues: TR7 - Light scratches on top of case, but looks solid black from 2 feet front view Used very little over 15 years I've had it. I was working in Egypt for most of that time and it was boxed up at home. Case screws underneath are not original, but fit properly. One screw on bottom holding case on was broken off. It can be extracted and replaced. Speaker case is slightly bent at top back. Probably can be straightened. Front panel and controls are perfect. Over two seasons on 160 CW, I worked 70 countries running barefoot with an inverted-L Reason for selling - Retired and need money for receiver projects. Shipping at cost. It will take at least three boxes for safety and security. Estimate $100 Could meet half way if reasonable from Pittsburgh. Traveling to Boston by car from 29th to 4th and could drop off if you are near the path Will never go on eBay. If no interest here I will put it on QTH and QRZ. Can meet you on the air from 160 to 10 if you want to hear what it sound like. Pictures are here - https://plus.google.com/photos/103146183216051782359/albums/5843761461331631601 Price: $650 plus shipping Thanks, Jim W3BH Saxonburg, PA 16056 About 20 miles NNE of Pittsburgh ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 freq counting up
I've just acquired a TR7 that has full output and is functional on all bands except ten and fifteen meters. On those bands, the displayed frequency starts at 51.xx and continues to count up. Not sure what's going on. Anyone familiar with this condition? Thank you. K3PNI. Sheldon Sent from my iPad ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 freq counting up
Sheldon, That means the PLL is out of lock. The most common cause is mild corrosion on the card contacts. Re-seating the cards will usually fix that problem plus a few problems you haven't yet discovered. Take care not to bump the pots on the right front. Tom, AG9X On Sun, May 19, 2013 at 11:05 AM, Sheldon Gofberg sgofb...@yahoo.comwrote: I've just acquired a TR7 that has full output and is functional on all bands except ten and fifteen meters. On those bands, the displayed frequency starts at 51.xx and continues to count up. Not sure what's going on. Anyone familiar with this condition? Thank you. K3PNI. Sheldon Sent from my iPad ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7
Hi All; I’m trying to get the audio on my TR7 to work properly and making some progress. One thing that seems strange, Q2101 and Q2102 on the power supply board have mica isolators behind them attached with metal hardware which defeats the isolators and I can’t imagine the transistors shouldn’t be attached to the heatsink. Anyone know? Thanks, Norm FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family! Visit http://www.inbox.com/photosharing to find out more! ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7
Y'know, I just had that area apart on mine a week and a half ago, but I don't recall the specifics of the mounting. The collector of Q2101 is definitely hot, but it is a plastic encased device with the only exposed metal on the back side, as I recall. Metal hardware on the top side shouln't be a problem. If it were, the rig wouldn't be working at all, as you would have no +10V. U2102 is the 5 volt regulator IC, and should have a plastic bushing under the nut. Although it could be bolted directly to ground, as the tab of the device is common to the ground leg, Drake may have chosen not to do so to avoid the possibility of a ground loop in the 5V supply. If there's no plastic bushing, someone messed up somewhere along the line. 73 -Jim NU0C On Sun, 1 Jul 2012 20:08:26 -0700, k6uo wrote: I'm trying to get the audio on my TR7 to work properly and making some progress. One thing that seems strange, Q2101 and Q2102 on the power supply board have mica isolators behind them attached with metal hardware which defeats the isolators and I can't imagine the transistors shouldn't be attached to the heatsink. Anyone know? -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7
To all the helpful folks on the list, I have a number of Drake radios and recently I was given a TR7 with audio problems. Upper and lower sideband sound the same. I have a service manual and a set of extender boards. The 10V adjustment is exactly 10 Volts and the 40 MHz oscillator is 40 MHz, the VCXO is 53.695. The 8.05 MHz oscillator is where I’m having problems, following the instructions in the manual, I see 10.564 MHz at pin 40 and C1030 doesn’t have much effect. Sideband audio sounds like it’s on the opposite sideband, the adjustments on the VR board don’t change the audio. I have a fairly good background in repair, but you know about the age thing—. Any help and guidance will be greatly appreciated. Norm, k6uo FREE 3D MARINE AQUARIUM SCREENSAVER - Watch dolphins, sharks orcas on your desktop! Check it out at http://www.inbox.com/marineaquarium ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7
The first thing to do with any TR-7 suffering from strange problems is to check for dirty/oxidized Molex pin connectors between the plug-in cards and the parent board. Often simply exercising them by unplugging and plugging back in a couple of times is enough. Also highly recommended is to replace the electrolytic cap(s) on the VR board while you're in there. Despite it's apparent complexity, the TR-7 is actually pretty simple in the way it works. :) 73 -Jim NU0C On Wed, 27 Jun 2012 10:21:36 -0700, k6uo wrote: To all the helpful folks on the list, I have a number of Drake radios and recently I was given a TR7 with audio problems. Upper and lower sideband sound the same. I have a service manual and a set of extender boards. The 10V adjustment is exactly 10 Volts and the 40 MHz oscillator is 40 MHz, the VCXO is 53.695. The 8.05 MHz oscillator is where Iâm having problems, following the instructions in the manual, I see 10.564 MHz at pin 40 and C1030 doesnât have much effect. Sideband audio sounds like itâs on the opposite sideband, the adjustments on the VR board donât change the audio. I have a fairly good background in repair, but you know about the age thingâ. Any help and guidance will be greatly appreciated. -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7, R7, R8 and Amp
Gang,I'm posting this for a non-ham seller.At our recent hamfest there was a display of all Drake equipment includingTR7, R7, R8 and Amplifier. The panels were immaculate - didn't look inside.Each item had a price - out of my range.Please contact the seller (not me) for details:lisa.ha...@verizon.net Thank and 73Larry K3VX ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 operation on 60 meter questions
Anyone running the TR7 on 60 meters? If so... -how are you making sure you keep w/i the 50 watt PEP limit? -is the factory TR7 audio bandwidth w/i the 2.8 Khz channel limitation? -do you just tune 1.5Khz below center channel? -anything else? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 operation on 60 meter questions
On Sat, 11 Feb 2012 05:27:28 -0800 (PST), Ron wrote: Anyone running the TR7 on 60 meters? If so... I never have, but -how are you making sure you keep w/i the 50 watt PEP limit? You can keep the mic gain down and reference a PEP reading wattmeter. This works particularly well if you run an RF speech processor like the SP-75 or similar. Another method would be to apply a variable negative DC voltage to the ALC input and adjust so the ALC kicks in at 50 Watts. Very little current is required, you can do it with a 9V battery connected across a poteniometer. -is the factory TR7 audio bandwidth w/i the 2.8 Khz channel limitation? The SSB filter in the TR-7 is 2.4 KHz, so, yes. -do you just tune 1.5Khz below center channel? Most 60 Meter charts that I have seen will show a carrier frequency to use to set your signal on the center of the channel. Since the DR-7 is a true carrier frequency display, that makes it simple. If you really want to be spot on, you will need to figure the distance from the TR-7 carrier frequency to the middle of the 2.4 KHz passband, and use that value for your channel center offset. -anything else? Report back on how it goes. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Fan
No, you don't NEED to run the fan for SSB. However, unless it bothers you, (perhaps not the 'silent' Drake fan?,) it will improve the stability of the transceiver 'short term', and extend the life of the transceiver 'long term'. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Woody wrote: /Good Morning from Alabama on a Beautiful Spring Day, with the Apple Trees in Bloom (Strange Weather)/ /But my question is do I need to run the fan on the TR7 for just normal SSB operation? I don't see the need for it but what do I know. I just want an opinion from experts./ /Thanks/ /Woody / -- __ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 ALC access when not using PS7
I am sure that are at least a few folks who are using the TR7 with a power supply other than the PS7. And I am thinking of those some are using linears. So where and how did you gain access to the ALC line of the TR7? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Ron - Pin 9 of the PS-7 Control connector. The 10 Pin Jones connector. Pin 10 is ground. Some day when you're bored, you could go in and link Pin 9 over to that SPARE phono jack just above it. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: I am sure that are at least a few folks who are using the TR7 with a power supply other than the PS7. And I am thinking of those some are using linears. So where and how did you gain access to the ALC line of the TR7? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Ron - Oh, and the VOX relay contact is right next to it on Pin 8. A REAL relay contact too, none of this wimpy reed relay stuff. :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: I am sure that are at least a few folks who are using the TR7 with a power supply other than the PS7. And I am thinking of those some are using linears. So where and how did you gain access to the ALC line of the TR7? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
You need a Cinch-Jones S-310 CCT plug and connect the shield of the alc cable to pin 10. Connect the center to pin 9. Plug into the matching 10 pin PS7 socket on the rear of the TR7. 73, Joe KC9LAD At 07:41 AM 1/28/2012, you wrote: I am sure that are at least a few folks who are using the TR7 with a power supply other than the PS7. And I am thinking of those some are using linears. So where and how did you gain access to the ALC line of the TR7? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Curious as to why the VOX and ALC come from the power supply rather than the rig itself. I always thought that was a strange arrangement. Fortunately, I have a stereo cable with color coded channels so it makes connection simple but would be simpler to run shorter leads directly from the rig to the linear. Drake always seemed to have good reasons for what they did but this one has me puzzled, hi hi... 73, Evan, K9SQG -Original Message- From: Garey Barrell k4...@mindspring.com To: Ron wd8...@yahoo.com Cc: drakelist drakelist@zerobeat.net Sent: Sat, Jan 28, 2012 9:37 am Subject: Re: [Drakelist] TR7 ALC access when not using PS7 Ron - Oh, and the VOX relay contact is right next to it on Pin 8. A REAL relay contact too, none of this wimpy reed relay stuff. :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: I am sure that are at least a few folks who are using the TR7 with a power supply other than the PS7. And I am thinking of those some are using linears. So where and how did you gain access to the ALC line of the TR7? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
On Sat, 28 Jan 2012 09:36:20 -0500, Garey Barrell wrote: Oh, and the VOX relay contact is right next to it on Pin 8. A REAL relay contact too, none of this wimpy reed relay stuff. :-) Or surface mount transistors. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
On Sat, 28 Jan 2012 10:32:36 -0500 (EST), K9sqg wrote: Curious as to why the VOX and ALC come from the power supply rather than the rig itself. I always thought that was a strange arrangement. Perhaps they though the rear panel of the radio was getting too cluttered. More puzzling/annoying to me is why some of the asian rigs use a hard to source mega-DIN connector for these connections. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Remember Jim, today's engineering staff (or should I say finance and marketing engineering staff) is not to worry about your cost of ownership. They are there to get the equipment sold at best profit margin possible and then obsoleted so that you will buy another. It's all about cash flow. BTW I am not blaming the companies. Unfortunately, we do this to ourselves with the way we invest, shop and consume. 73 Ron WD8SBB --- On Sat, 1/28/12, Jim Shorney jshor...@inebraska.com wrote: From: Jim Shorney jshor...@inebraska.com Subject: Re: [Drakelist] TR7 ALC access when not using PS7 To: drakelist@zerobeat.net drakelist@zerobeat.net Date: Saturday, January 28, 2012, 11:01 AM On Sat, 28 Jan 2012 10:32:36 -0500 (EST), K9sqg wrote: Curious as to why the VOX and ALC come from the power supply rather than the rig itself. I always thought that was a strange arrangement. Perhaps they though the rear panel of the radio was getting too cluttered. More puzzling/annoying to me is why some of the asian rigs use a hard to source mega-DIN connector for these connections. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Ron - I'd be inclined to use the fixed 'line' AUDIO jack. The counter input can be handy, obviously as a counter, but also as a good quick troubleshooting tool for the radio. The other alternative of course is to get the proper connector, they are available, or use the 'spade' type power connectors used in auto stuff. They will slip right over the Jones pins. http://www.electronicplus.com/content/ProductPage.asp?pagenum=1lname=maincat=wcsubcat=wci 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: Gary, Any ideas on where to put another RCA jack for the VOX relay? Maybe steel the counter input? 73, Ron WD8SBB --- On Sat, 1/28/12, Garey Barrellk4...@mindspring.com wrote: From: Garey Barrellk4...@mindspring.com Subject: Re: [Drakelist] TR7 ALC access when not using PS7 To: Ronwd8...@yahoo.com Cc: drakelist@zerobeat.net Date: Saturday, January 28, 2012, 9:36 AM Ron - Oh, and the VOX relay contact is right next to it on Pin 8. A REAL relay contact too, none of this wimpy reed relay stuff. :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: I am sure that are at least a few folks who are using the TR7 with a power supply other than the PS7. And I am thinking of those some are using linears. So where and how did you gain access to the ALC line of the TR7? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Hi Jim: Those Din types are really no harder to find than the multi-pin Jones conn's ! :) Curt On 1/28/2012 11:01 AM, Jim Shorney wrote: On Sat, 28 Jan 2012 10:32:36 -0500 (EST), K9sqg wrote: Curious as to why the VOX and ALC come from the power supply rather than the rig itself. I always thought that was a strange arrangement. Perhaps they though the rear panel of the radio was getting too cluttered. More puzzling/annoying to me is why some of the asian rigs use a hard to source mega-DIN connector for these connections. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
On Sat, 28 Jan 2012 11:53:15 -0500, Garey Barrell wrote: I'd be inclined to use the fixed 'line' AUDIO jack. The counter input can be handy, obviously as a counter, but also as a good quick troubleshooting tool for the radio. Or just drill a hole for another RCA jack, or even a mini earphone jack. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Yeah, I understand engineering to price points. On the smaller rigs, it's more an issue of availabe real estate on the rear panel. Doesn't mean I have to LIKE it... :) 73 -Jim On Sat, 28 Jan 2012 08:31:30 -0800 (PST), Ron wrote: Remember Jim, today's engineering staff (or should I say finance and marketing engineering staff) is not to worry about your cost of ownership. They are there to get the equipment sold at best profit margin possible and then obsoleted so that you will buy another. It's all about cash flow. BTW I am not blaming the companies. Unfortunately, we do this to ourselves with the way we invest, shop and consume. -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Ron - Yes, that is a good way to speed up the amp keying. A half mA shouldn't be a problem, those lines are 'fused' very closely, but they should survive that! :-) Saves a whole ~25 mSec!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: Gary, You mentioned the VOX pin being a real relay. The HK pg 37 Nov 1988 QST shows a way to use the motherboard 10V TX line and a few components to key your amp sooner/faster. I am looking at doing that only for the extra speed in getting the amp in line. Based on my tests so far, it looks like I will load.5ma on the 10V TX line. Thoughts? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
On Sat, 28 Jan 2012 13:08:15 -0500, Garey Barrell wrote: A half mA shouldn't be a problem, those lines are 'fused' very closely, but they should survive that! :-) That's actually funny, because years ago I first heard tech calling transistors three-legged fuses. A corollary to Murphy's Law is The transistor will always blow to protect the fuse. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
Jim Shorney wrote: On Sat, 28 Jan 2012 13:08:15 -0500, Garey Barrell wrote: A half mA shouldn't be a problem, those lines are 'fused' very closely, but they should survive that! :-) That's actually funny, because years ago I first heard tech calling transistors three-legged fuses. A corollary to Murphy's Law is The transistor will always blow to protect the fuse. Oh yeah, that's been a LONG time ago.. :-) Best description we had at the time.. I was working on 400 MHz power amplifiers in the early 60's, and both _very_ accurate. One of the engineers I worked with came into my office one day and said, You know what, you can SEE a little blue flash through the ceramic cap on the power transistors we were 'attempting' to use. Of course every time one went out it magnetized the ferrite core(s) in the matching network so that was just one more step to get back where we were before we got like we were then! :-) Made it though, 40W output w/ 2W input at 4xx. (Command Destruct frequency, so classified.) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 ALC access when not using PS7
On Sat, 28 Jan 2012 13:52:08 -0500, Garey Barrell wrote: you can SEE a little blue flash through the ceramic cap Nice of them to design the device to contain the magic blue smoke, though. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 band selection BCD output
I know to some this will be a bad idea, but I was reading the 2012 Handbook and thinking about some way to output the band information from my TR7. That might then drive the automatic antenna switch described on page 24.4. There is the 4 pin BCD band switch data input to the digital control board which gets me very close. Any ideas about other control data points where I can pick up more specific data so as to identify the WARC bands? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 band selection BCD output
You would probably want to look at the buffered output of the up/down counters on the DR-7, U9007 and U9008. 73 -Jim NU0C On Sat, 21 Jan 2012 12:24:09 -0800 (PST), Ron wrote: I know to some this will be a bad idea, but I was reading the 2012 Handbook and thinking about some way to output the band information from my TR7. That might then drive the automatic antenna switch described on page 24.4. There is the 4 pin BCD band switch data input to the digital control board which gets me very close. Any ideas about other control data points where I can pick up more specific data so as to identify the WARC bands? -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 PIN diodes source
I've got my replacement PIN diodes from www.futureelectronics.com to a reasonable price even when these items were declared as not in stock at the time of order last year. Two or three weeks later i found the diodes well packed in my post box. So give them a try... 73 de Karl, DK7AL Am 22.11.2011, um 13:01:49 schrieb Randall M. Payne: I too can vouch for Bob W7AVK as a source for the diodes. Very prompt and responsive to questions. Randy K4EZM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 PIN diodes source
check with Bob W7AVK e-mail, you fix it - rolfb at accima.com As far as I know he has both the high and low powered diode and at a really good price. I got some from him recently. He also has (had) the TR7 service extender boards too. Both something you need to keep the TR7 going when they act up. I have no interest in Bob's work other than a satisfied customer of all the above mentioned pieces parts. 73, Ron WD8SBB --- On Tue, 11/22/11, scpmil...@aol.com scpmil...@aol.com wrote: From: scpmil...@aol.com scpmil...@aol.com Subject: [Drakelist] TR7 PIN diodes source To: drakelist@zerobeat.net Date: Tuesday, November 22, 2011, 12:33 AM It's looking like I may have TR switch problems (diode has the same resistance either direction. This is the high power PIN diode in the TR switch. Does anyone know of a current source for the UM 9400 (or MA4P1200) PIN diodes in the TR Switch? Are there any substitutes for these diodes? Many years ago I got some from Down East Microwave but they don't show them anymore. Thanks Steve KD2ED -Inline Attachment Follows- ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 PIN diodes source
I too can vouch for Bob W7AVK as a source for the diodes. Very prompt and responsive to questions. Randy K4EZM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 PIN diodes source
It's looking like I may have TR switch problems (diode has the same resistance either direction. This is the high power PIN diode in the TR switch. Does anyone know of a current source for the UM 9400 (or MA4P1200) PIN diodes in the TR Switch? Are there any substitutes for these diodes? Many years ago I got some from Down East Microwave but they don't show them anymore. Thanks Steve KD2ED___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7-A Antenna Relay
Fellow: I need an Antenna Relay Part # R10-E4-Y4-V185 made by Potter Brumfield. It is plug in and has 4 poles. Thanks, Randall Murphree, W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A Antenna Relay
Digikey has them. http://parts.digikey.com/1/parts/752107-relay-gp-3a-4pdt-12vdc-r10-e1y4-v185.html 73, Joe Pyles KC9LAD At 08:08 AM 11/5/2011, you wrote: Fellow: I need an Antenna Relay Part # R10-E4-Y4-V185 made by Potter Brumfield. It is plug in and has 4 poles. Thanks, Randall Murphree, W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A Antenna Relay
Randall - There is no 'E4' version of these relays. I think what you want is the E1-Y4-V185. This is the 12VDC coil version that plugs into the standard relay socket. Similar to the 4 Line, except that one is 48 VDC coil. Mouser, Digi-Key, etc., stock them, about $25. -- 73, Garey - K4OAH St Charles, IL Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Randall Murphree wrote: Fellow: I need an Antenna Relay Part # R10-E4-Y4-V185 made by Potter Brumfield. It is plug in and has 4 poles. Thanks, Randall Murphree, W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7-A
Hi Gang : Can any one tell me if the Drake RV-7 VFO will workwith the TR7-A and also does it give a read out digitally ?Thanks a lot !!Dave ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A
Dave - Yes, and Yes. :-) The RV-7 frequency reads out on the TR-7 display when 'in control'. There is really no functional difference between a TR-7 and a TR-7A, the 'A' just came with more standard accessories, NB, CW filter, etc. There is one more jack on the rear panel, an auxiliary mic input. 73, Garey - K4OAH St Charles, IL Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Dave Loewer wrote: Hi Gang : Can any one tell me if the Drake RV-7 VFO will work with the TR7-A and also does it give a read out digitally ? Thanks a lot !! Dave ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 questions AGC
Hi Ian, There is no risk performing the all band TX mod on the TR7 and it is an easy way to get the WARC bands using the UP-DOWN buttons. I used that method before I installed the AUX7 module. Regarding the AGC. Do you want something faster than the current FAST setting via the front panel AGC switch (F/S)? Or do you want it to change with the mode selection? I haven't seen any such modification as it's kind of nice to be able to select the AGC speed independently of the mode. I would assume if you feel the current FAST isn't fast enough that we couldn't dig into the schematic and play with a resistor value that could speed it up more. I just haven't read of anyone who felt it was to slow in the FAST setting. 73 Don N9OO www.radiolabworks.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 AM Broadcast
*The TR7 that I have has at some point had the mod done it to where it will receive everywhere, when you put the Aux program sw. in the 1, 2 or 3 position. In the 1 position receive from 800 to 1600 or so the am stations are clear but in the 2 position where you would receive the normal AM radio it is not plain at and doesn't pick up well. Is this normal? Or was the mod not done correctly? I had found the mod on one of the web sites and got to fooling around and found that it had been done, Not that I use this often just found it was there and wondering. * *Thanks Again* *Woody* *Still Looking for a L7* -- * * * If you forward this e-mail, please delete the forwarding history, which includes my email address. It is a courtesy to me and to others who do not wish to have their e-mail addresses sent all over the world. * * * * ** If you are including me in a multi-address email,** please use the** Bcc **feature.** In your email address which will be under the TO: block. It still sends emails the same but everyone does not see the other address only theirs. * *Thanks* *Woody* ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 problem
Dan - Your symptom is due to the phase-locked loops failing to lock. First step is to at least unplug and re-plug each card and connector, preferably applying liquid DeoxIT to all contacts as you go. If this does NOT clear up all your problems, check the DC voltages, especially the -24 VDC, and report back! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com dpetersen tds.net wrote: Hello Group: I am the recent recipient of a Drake TR7 with the PS7 power supply. It has evidently been in its original carton since 1987 and is in pristine condition. I fired it up to check it out and all seems well except on 20 and 10 meters. When switched to those bands the frequency (for 20 meters) goes to around 11.5 MHz and starts tuning upwards rapidly, finally slowing to a stop after about a minute. 10 meters starts at about 26 MHz and scrolls the same way. I can hear signals go by as it scrolls. All other bands seem OK. Any ideas from the think tank? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 problem
Hello Group: I am the recent recipient of a Drake TR7 with the PS7 power supply. It has evidently been in its original carton since 1987 and is in pristine condition. I fired it up to check it out and all seems well except on 20 and 10 meters. When switched to those bands the frequency (for 20 meters) goes to around 11.5 MHz and starts tuning upwards rapidly, finally slowing to a stop after about a minute. 10 meters starts at about 26 MHz and scrolls the same way. I can hear signals go by as it scrolls. All other bands seem OK. Any ideas from the think tank? -- 73, Dan - W7OIL *=== = = = = === === === === = = = === === === = = = === = = ** * ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 problem
On Wed, 10 Aug 2011 21:03:32 -0700, dpetersen tds.net wrote: the frequency (for 20 meters) goes to around 11.5 MHz and starts tuning upwards rapidly, finally slowing to a stop after about a minute. 10 meters starts at about 26 MHz and scrolls the same way. I can hear signals go by as it scrolls. All other bands seem OK. Any ideas from the think tank? Oxidized Molex pin connectors on the PC boards. Lots of talk on this subject in the list archive. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A No power out in cw or phone
resending that message that got blocked. Appears to be intermittent. --- On Sat, 8/6/11, Ron wd8...@yahoo.com wrote: From: Ron wd8...@yahoo.com Subject: Re: [Drakelist] TR7-A No power out in cw or phone To: Drakelist@zerobeat.net Drakelist@zerobeat.net, Jim Shorney jshor...@inebraska.com Date: Saturday, August 6, 2011, 8:07 AM Be careful as you pull the DR7 board. Easy to bump the rig's internal voltage regulator board pots (just to the right and behind the PTO). I also put an index mark on the plugs and board. The R77 board does not seem to have indexed connectors. Or at least I am not seeing them. I found that a old computer chassis card blank (L-shaped piece of metal) works well as a mini pry bar. Don't get aggressive, just a little help. Look around for screws holding things. There are a couple in not so obvious places. 73, Ron WD8SBB --- On Sat, 8/6/11, Jim Shorney jshor...@inebraska.com wrote: From: Jim Shorney jshor...@inebraska.com Subject: Re: [Drakelist] TR7-A No power out in cw or phone To: Drakelist@zerobeat.net Drakelist@zerobeat.net Date: Saturday, August 6, 2011, 1:21 AM First step: unplug each circuit board, clean and DeOxit the pins and sockets, and reseat boards. This clears up an awful lot of 7-line problems. 73 -Jim On Fri, 5 Aug 2011 01:05:04 -0400 (EDT), Randall Murphree wrote: 1. All lights light up on a ham frequency except the mic gain green light. 2. In cw mode it clicks but there is no power out. 3. With mic plugged in no power out. 4. Have check the fuse in the power supply which is a PS7. Thanks, Randall Murphree, W4DEU -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A No power out in cw or phone
On Sat, 6 Aug 2011 05:07:43 -0700 (PDT), Ron wrote: I found that a old computer chassis card blank (L-shaped piece of metal) works well as a mini pry bar. Don't get aggressive, just a little help. And, for the other boards, instructions to make a copy of the Drake card puller are here: http://members.ziggo.nl/cmulder/drake.htm#bookmark9 73, -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A No power out in cw or phone
Jim Shorney wrote: On Sat, 6 Aug 2011 05:07:43 -0700 (PDT), Ron wrote: I found that a old computer chassis card blank (L-shaped piece of metal) works well as a mini pry bar. Don't get aggressive, just a little help. And, for the other boards, instructions to make a copy of the Drake card puller are here: http://members.ziggo.nl/cmulder/drake.htm#bookmark9 Jim - I 'improved' upon that approach by just cutting off one V end of the coat hanger. You put your hand in the V, and lever against your wrist on top of the other cards. MUCH more controlled force, and no YIKES when the pins suddenly let go. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A No power out in cw or phone
On Sat, 06 Aug 2011 11:37:03 -0400, Garey Barrell wrote: I 'improved' upon that approach by just cutting off one V end of the coat hanger. You put your hand in the V, and lever against your wrist on top of the other cards. MUCH more controlled force, and no YIKES when the pins suddenly let go. Garey, you just HAVE to be different, don't you? :) I should point out, for those who have not been there, done that yet, the board puller mates up with small holes near the upper edge of the vertcally interted boards. The wide boards will have two holes, narrow boards will have only one. As a side note, some of the boards have copper grounding fingers attached - make sure the mating surfaces are clean and the fingers are springy enough to make contact. I don't recall who first posted the PC slot cover idea for a DR-7 puller, but that was one of those d'oh! moments for me when I first read it. I was a PC tech for over 10 years, and I'm always tripping over those things around here. I just never made the connection. IBM slot covers are much better than any of the others, of course 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A No power out in cw or phone
Jim Shorney wrote: On Sat, 06 Aug 2011 11:37:03 -0400, Garey Barrell wrote: I 'improved' upon that approach by just cutting off one V end of the coat hanger. You put your hand in the V, and lever against your wrist on top of the other cards. MUCH more controlled force, and no YIKES when the pins suddenly let go. Garey, you just HAVE to be different, don't you? :) IBM slot covers are much better than any of the others, of course Nope, don't knock it before you try the V. The ends are bent at the tip just like the square one. You can spread it to pick up both holes, just like the square one, or works just as well on the single hole since it's controllable that way too. Better than any PC left-over!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A No power out in cw or phone
First step: unplug each circuit board, clean and DeOxit the pins and sockets, and reseat boards. This clears up an awful lot of 7-line problems. 73 -Jim On Fri, 5 Aug 2011 01:05:04 -0400 (EDT), Randall Murphree wrote: 1. All lights light up on a ham frequency except the mic gain green light. 2. In cw mode it clicks but there is no power out. 3. With mic plugged in no power out. 4. Have check the fuse in the power supply which is a PS7. Thanks, Randall Murphree, W4DEU -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7-A dead on transmit
Need advice on no RF out. W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A dead on transmit
Need more information. Are the lights on? Frequency readout? Is it tuned within an Amateur band? Are all the buttons on the front panel Out? Does the relay click when you PTT or close the CW key? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Randall Murphree wrote: Need advice on no RF out. W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7-A dead on transmit
Need to insert lumpy bit on end of mains cable into holes in shack wall. On 08/04/2011 04:11 PM, Randall Murphree wrote: Need advice on no RF out. W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7-A No power out in cw or phone
1. All lights light up on a ham frequency except the mic gain green light. 2. In cw mode it clicks but there is no power out. 3. With mic plugged in no power out. 4. Have check the fuse in the power supply which is a PS7. Thanks, Randall Murphree, W4DEU ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 D104
*A few days ago I posted a question about using a D104 with my TR7, seeing that's the only mike I have or have ever used for the past 20 odd years on my other Drakes and Ten Tec's. I got a lot of help and some that were way too deep for An Old Country Boy . I use the D104 head mounted on a boom, I built a adapter years ago for it. Evan and a couple of more said to use a 470K resistor with it, well I couldn't find one but in my Archer box I found a 620K and put in line inside the head of the mic, I have tried it several times today and got great audio reports on 80 and 15 mtrs, still on 80 I have to run the gain at about the 8 o'clock position but it gives me around 125 watts and great audio. I guess I'll keep on running the 104's and save the 80 or so bucks for a new mike and put it towards another piece of Drake **equipment I've only got 17 pieces now, My Wife is gonna be so Happy to see another piece come in. * Thanks for all the Help Steve aka Woody KO 4 By Golly -- ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 D104
- Original Message - From: Woody ko4...@gmail.com To: Drake List drakelist@zerobeat.net Sent: Friday, July 08, 2011 2:33 PM Subject: [Drakelist] TR7 D104 *A few days ago I posted a question about using a D104 with my TR7, seeing that's the only mike I have or have ever used for the past 20 odd years on my other Drakes and Ten Tec's. I got a lot of help and some that were way too deep for An Old Country Boy . I use the D104 head mounted on a boom, I built a adapter years ago for it. Evan and a couple of more said to use a 470K resistor with it, well I couldn't find one but in my Archer box I found a 620K and put in line inside the head of the mic, I have tried it several times today and got great audio reports on 80 and 15 mtrs, still on 80 I have to run the gain at about the 8 o'clock position but it gives me around 125 watts and great audio. I guess I'll keep on running the 104's and save the 80 or so bucks for a new mike and put it towards another piece of Drake **equipment I've only got 17 pieces now, My Wife is gonna be so Happy to see another piece come in. * Thanks for all the Help Steve aka Woody KO 4 By Golly -- I'm glad it worked out:-) When I started working for a TV network I took my girl friend on a tour, I was very happy to have gotten the job and wanted to show the place (and myself off). After a few minutes of walking around she said All this stuff looks the same, lets go somewhere else. Well, I took her up on a stage and we watched Sally Struthers rehearsing something. I was about as deflated as a child's baloon that has been run over by a steam roller. I guess you can't win them all. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 x-lock observations.
Hello group, In early February, I mentioned that I have the x-lock installed on my TR7 and generally find it a very good modification. I wanted to follow up on that comment to include one minor annoyance. As best I can tell this is an annoyance for any huff-puff circuit installed using the RIT line for frequency lock control. I believe that a more complex installation of a huff-puff circuit could fix this, but have not had time to analyzed it closely. A huff-puff (x-lock included) circuit using the TR7's internal RIT line as frequency lock control does not understand dual PTOs that are present with an active RV7. This appears to be because the TR7's RIT voltage is common to both the internal PTO and the RV7's PTO. Since the x-lock fully supports RIT, this only presents an issue if you are chasing DX and need to run the RV7 for wide frequency splits. I still highly recommend the x-lock modification to stabilize the TR7. I have no monetary interest in x-lock or it's company Cumbria Designs. 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 refurb
Greetings to all, I just purchased a TR7 that needs some TLC. Need recommendations on paint for the cabinet, source for plastic end caps (watching some on Ebay currently), microphones (yes, I realize a lot of personal preference is involved here). Wondering if anyone has adapted a computer/cell phone headset to the TR7? Thanks for the help. Looking forward to getting this on the air. 73, Randy K4EZM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 refurb
Randy, I hope someone will chime in on the paint, but Mike March, K4QU,makes the plastic end caps FAR cheaper than I have seen them on Ebay. He has three sizes, as I remember, to cover the TR7, accessories and the L7 amps. Email him at mikek...@gmail.com . No connection other than a VERY satisfied customer. Google March Magnetic Paddles and see some of his handywork!! 73, Don, WB5HAKI ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 refurb
Randy, If the sticky paint is the problem, give Claudio's (I4YHH) solution a try: _http://www.wb4hfn.com/DRAKE/DrakeArticles/StickPaintFix.htm_ (http://www.wb4hfn.com/DRAKE/DrakeArticles/StickPaintFix.htm) It does actually work! 73 Lee WB6SSW ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 refurb
On Wed, 23 Mar 2011 09:34:47 -0400 (EDT), RANDALL EVELYN PAYNE wrote: microphones http://www.mail-archive.com/search?q=microphonel=drakelist%40zerobeat.net -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 BCD stuff..GURU's beware
Hi all,
Here is a chance for all of the gurus to shineAnyone got a good set of
truth tables, for a Digital Control Board and a Translator Board
Original headache, never mind that there (still) is no sound . DR7 board 2
Megs down.
Ok I'm going a little cockeyed.
Digital control Board to Translator board with the extenders and adaptor
board in. The adapter board is a pass threw from everything I've read,
alleviating any headache with the DR7.
Using the example in the manual Pg 1-3 at 14+ megs its a 34
Well I have a 28.5 M at 51...if this sounds right would someone let me
know.
But some writers definition of most significant vs least significant
defies my logic...
In any case...28.5 M Per the manual 41-44 least, 46-49 most significant.
(on the Translator Board)
Assumptions... .5 V = LO ; 4.5 V = HI . I was given a truth on the
Trans board for 28.5M
DCBoard (IS) Translator Board
(IS) --Should Be
41 HI41
LO LO
42 1.8v goofy42 HI
HI
43 1.8v 43
1.48v goofy LO
44 LO .001 ?44 1.5v
HI
45 HI 46
LO LO
46 HI 47
LO LO
47 HI 48
LO LO
48 LO .000 ? 49HI
HI
Now if I switch to 14 M
41 LO 41 LO
42 LO 42 HI
43 LO 43 1.48v
goofy ...Note this goofy on all freqs
44 HI 44 1.51v
this too
45 HI 46 HI
46 LO 47 HI
47 HI 48 LO
48 LO 49 LO
The question is Which Way Do I GO ? DCB or Translator? I'm getting
tired and you can only cram so much education into an old F..T during any
specific time period.
Carl wd8nhk___
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[Drakelist] TR7 No Standby or Mute
Hi guys, This morning during my vintage AM net, my antenna changeover relay decided to quit on me, so I switched on my TR7 to use as a receiver. As there's no standby mode, before transmitting (100 watts) I turned the RF and AF gain all the way down and manually switched the antenna to the TR7 with the coax switch. It didn't work so well though. As I often have both rigs on at a time, it would be nice to be able to mute the ones not in use rather than turn them off, especially those that need to stay warm. I've looked through the TR7 manual, but I can't seem to find anything on a standby mode. Does anybody know of a way to use the TR7's receiver with another transmitter? Thanks 73, Tony K4KYO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 No Standby or Mute
Tony - I'm not aware of any external 'Standby' control for the TR-7 receiver. A quick look at the schematic shows that the AF OUTPUT chip has it's own +13.6 VDC source on Pin 30 of the 2nd IF/AF board. There is a 22 uF cap on the line, so the cut off 'might' be a little slow, but it looks like you could just interrupt that supply and MUTE the receiver. There may be another way to inhibit a part of the 10R bus, (the 'normal' standby internally is accomplished by turning off the entire 10R bus,) so that could also be done by control on the Transmit/Exciter board via Q307 and Q308. Grounding the Base of Q308 would MUTE the receiver. Unfortunately that is the inverse of Drake MUTE circuits which OPEN a ground connection to MUTE the receiver, so an inverter stage would be necessary. Still only a transistor/resistor to invert. There are a few spare pins and at least one RCA jack on the back panel that could be used. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Richard A. (Tony) Stalls wrote: Hi guys, This morning during my vintage AM net, my antenna changeover relay decided to quit on me, so I switched on my TR7 to use as a receiver. As there's no standby mode, before transmitting (100 watts) I turned the RF and AF gain all the way down and manually switched the antenna to the TR7 with the coax switch. It didn't work so well though. As I often have both rigs on at a time, it would be nice to be able to mute the ones not in use rather than turn them off, especially those that need to stay warm. I've looked through the TR7 manual, but I can't seem to find anything on a standby mode. Does anybody know of a way to use the TR7's receiver with another transmitter? Thanks 73, Tony K4KYO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 No Standby or Mute
Hi Garey, My first reaction is, Wow! I was hoping there was already a muting circuit, as with the TR7-R7 pairing, but in that case I doubt anyone would use the TR7 as the receiver. I'll get my Service Manual out and go from there. Thanks much! VY 73, Tony K4KYO At 01:28 PM 2/23/2011, Garey Barrell wrote: Tony - I'm not aware of any external 'Standby' control for the TR-7 receiver. A quick look at the schematic shows that the AF OUTPUT chip has it's own +13.6 VDC source on Pin 30 of the 2nd IF/AF board. There is a 22 uF cap on the line, so the cut off 'might' be a little slow, but it looks like you could just interrupt that supply and MUTE the receiver. There may be another way to inhibit a part of the 10R bus, (the 'normal' standby internally is accomplished by turning off the entire 10R bus,) so that could also be done by control on the Transmit/Exciter board via Q307 and Q308. Grounding the Base of Q308 would MUTE the receiver. Unfortunately that is the inverse of Drake MUTE circuits which OPEN a ground connection to MUTE the receiver, so an inverter stage would be necessary. Still only a transistor/resistor to invert. There are a few spare pins and at least one RCA jack on the back panel that could be used. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Richard A. (Tony) Stalls wrote: Hi guys, This morning during my vintage AM net, my antenna changeover relay decided to quit on me, so I switched on my TR7 to use as a receiver. As there's no standby mode, before transmitting (100 watts) I turned the RF and AF gain all the way down and manually switched the antenna to the TR7 with the coax switch. It didn't work so well though. As I often have both rigs on at a time, it would be nice to be able to mute the ones not in use rather than turn them off, especially those that need to stay warm. I've looked through the TR7 manual, but I can't seem to find anything on a standby mode. Does anybody know of a way to use the TR7's receiver with another transmitter? Thanks 73, Tony K4KYO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Paint Color Progress Report
Hi Tony, I am considering to repaint all the sticky wrap around cases here (in Germany) with the help of a local car spray boot operator. I will probably use a car paint out from the catalogue in a grey metallic colour but likely with a glossy final finish. This varnish will be cured by an elevated temperature and has after that a hard and durable surface without any sticking effect. If the painter has the skill to vary this varnish to some sort of wrinkle type I would go that way too. But if not, the glossy one will be my preferrable case surface for the future... This is what I am currently considering to solve the sticky paint problem for me. I do not see a realistic chance to get the original Drake paint style and colour on my cases. Sherwin Williams Textured Grey is probably nothing they know here... :) 73 de Karl, DK7AL Am 10.02.2011, um 22:50:05 schrieb Richard A. (Tony) Stalls: Thanks to the efforts of two very kind and patient persons in a position to know, I have been advised that the original TR7 line cabinet color is Sherwin Williams Textured Grey, F63TXA9815. That's the good news. The bad news is that it's not a current number in the Sherwin Williams catalogue, but the powder coat guy spoke with them today and it's a regular paint and it doesn't translate to powder coating colors. He added that they can do a match for powder coating, but the minimum for a custom order is sixty pounds, enough to do about 800 cases. I suppose that explains why Harzell only does them in black. I have a request into Sherwin Williams customer service department to see if there's a current catalogue name/number and if there is, I'll post it to the list. More than likely though, Ted Wright's excellent suggestion to take it to the paint store for a camera match is the most practical thing to do. Thanks to all for the ideas and suggestions! You guys are great! VY 73! Tony K4KYO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 nada
On Mon, 10 Jan 2011 22:36:39 -0600, Jim Shorney wrote: If the +10 is +/- 10 mV, you're probably OK there. I meant to type +/- 100 mV... 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 nada
Jim / Carl Great checklist! It sounds like the DR-7 is working ok in EXT mode. The 12 and 5 MHz signals are stable, so the VCO is locking, just off by 2 MHz. I think the problem is in the 'presets' of the Digital Control board, fed via the DR-7. I have seen a couple of instances of PROM failure on this board (early units, not the late one with nine ICs). There is a 'truth table' in the Service Manual. First thing I would do is pull the DR-7 and put in the Jumper Board from the Extender set. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Jim Shorney wrote: Some things to check (in no particular order): Make sure all the boards are properly seated. If oxidation on the Molex connectors is persistent, cleaning/DeOxit treatment should be used. Copper grounding fingers should be clean and make good contact with the frame. Also check for deformed female contacts in the Molex sockets; my R-7A had a blob of solder on a pin that bent the female contact. Worked OK for years, until I got it and pulled the board out. The sockets can desoldered from the board, and the contacts removed and retensioned. The DR-7 can be particularly difficult to seat properly, you will need to peek under the board from the rear/side to make sure that all the pins line up with the proper socket holes. Triple-check it. It can be done, but it's easier to do the DR-7 if you remove the PTO knob, bandswitch shaft, and top two front panel side screws, allowing the front panel to hinge down. The bandswitch shaft can be removed by removing the knob and the two rear screws on the detent mech and pulling out the back. Be careful pushing it though the switch wafers when reinstalling, go slowly and gently. Check also the power and voltage regulator connectors that plug into the DR-7 to make sure they are properly oriented, and check the voltage regulators for proper output. Check any mini-coax that you unplugged from boards. The center conductor should seat down into a pin socket in the PCB. It's possible to bend it over so that it will not make contact or short out. The bandswitch may be dirty, or the band change wire to the DR-7 may be loose/intermittent. Check the voltages from the power supply board in the front right corner of the rig. You should have +10.0, +24, and -3 to -4 (it's normal for the -5 to read low). If the +10 is +/- 10 mV, you're probably OK there. Outside that range, it should be adjusted to 10.0 and an alignment of the radio will likely need to be done (oscillators, fixed passbands, ACG/S-Meter). If there is a +24 problem, could be loose transformer core, bad electrolytic cap (replace electrolytics on this board anyway as preventative maintenance), or possibly a bad 78L24. Be careful around that DR-7 board, they are unobtanium except at high prices and not a lot of fun to repair. Also be careful making measurements, shorting out the +13 rail to ground anywhere inside the radio will instantly blow the internal fuse on the right side panel. DO NOT overfuse. Use an accurate digital voltmeter for the +10.0, it is the most critical voltage in the rig. All shield screws should be in place, snug but not overtight. They are easy to strip if you tighten too far. If you don't have a service manual, usable scans are available on the internet free, and some high quality repros are available at reasonable cost. Highly recommended, it is a very good service manual (kudos to Bill Frost and the team). 73 -Jim On Mon, 10 Jan 2011 16:48:23 -0500 (EST), gypsym...@aol.com wrote: Hello to the group. TR7 A: I have reseated all the boards. Stored unit for nine months. Hooked up yesterday. Digital freqs way off, 12xxx while in 20 M position 5xxx while in 40 M position...etc Did have some signals (SSB) input on the 20 M position, but mechanical dial says way off of anything normal. Exercising band switch gave momentary (as in seconds) relief from wrong scale. Did A: above. Then went to OS counter and triggered HT, it says ok, or close enough for horseshoes. HT was on 145.330 and it showed 144.729 Popped the bottom plate, 00 on the mechanical dial is 5.050 on the PT0. Reassembled boards...now nothing sound wise in any mode. Raster noise like no antenna. Suggestions on which way to start? Thank you, Carl WD8NHK PS This unit has always been a basket, it was working pretty well last spring. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 nada
Guys, I am fairly certain the digital programming section of the DR-7 will not affect the DR-7 display. If its just the display thats off and not the actual TR-7 operating frequency then the problem is strickly with the functioning of the display portion of the DR-7. The display uses the VCO and 500 khz references only. The portion of the board that controls frequency UP/DOWN, Out of band checks, and the expanded frequency coverage is completely separate from the display portion. I have repaired several of these boards in the past and troubleshooting them can be tricky. You need a really fast scope and some knowledge of the ciruit, which I am no expert on. I have notes that I have taken based on a set frequency dialed in if they would be helpful. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 nada
Hi Gary - Agreed. BUT Carl said in his initial message that the counter reads correctly in EXT mode on his HT. The digital control signals that set the BAND DO go through the DR-7 via U9005, 6, 7 and 8, hence the need for the Jumper Board to run without the DR-7 board in place. A fault in the '2' programming line 'could' cause a 2 MHz offset?? Or am I all wet. Again. :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Gary Poland wrote: Guys, I am fairly certain the digital programming section of the DR-7 will not affect the DR-7 display. If its just the display thats off and not the actual TR-7 operating frequency then the problem is strickly with the functioning of the display portion of the DR-7. The display uses the VCO and 500 khz references only. The portion of the board that controls frequency UP/DOWN, Out of band checks, and the expanded frequency coverage is completely separate from the display portion. I have repaired several of these boards in the past and troubleshooting them can be tricky. You need a really fast scope and some knowledge of the ciruit, which I am no expert on. I have notes that I have taken based on a set frequency dialed in if they would be helpful. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 nada
Carl - The Jumper Board makes it a lot easier to eliminate, (or indict!,) the DR-7. The counter preset information is carried between the Digital Board and the Translator Board on the pins on the left side of the DR-7, and they are susceptible to solder cracking with age, stress. The 'snapping / popping' sounds are concerning That deserves further investigation. Just to clarify, you said the HT read the 'correct' frequency. It's 'off' by 600 kHz, so I assume you had the repeater offset 'on'.?? A good extender board kit is available from W7AVK at http://www.wb4hfn.com/Services/W7AVK/tr7ext2.htm 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com gypsym...@aol.com wrote: k4...@mindspring.com writes: First thing I would do is pull the DR-7 and put in the Jumper Board from the Extender set. 73, Garey - K4OAH Hi Garey, This isn't going to make the xyl happy, already spend my Christmas money on an antenna analizer. Any suggestion as to brands of extender. I have the owners service manual. A Beckman 20 Meg scope, with 100 Meg probes it really gets close to the limits. Two high impedance voms. (Fluke Beckman), and for that matter my old Heathkit VTVM. The digits will now move around as I hear snapping popping noises. But will do additional checks today as soon as grandson goes for nap, or down for night. Still no normal sounds in any mode. Had at one point resoldered all of the pins, but will recheck that DR7 as could have been a tad rough I suppose. The small transformer on the PS board appears fine. I do not relish the thought but I could pull the boards from my good working TR7 as substitutes. Carl ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 nada results to this point
Sorry, that should have said that Pin 45 is chassis ground. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Garey Barrell wrote: He did not indicate pin 45 (it was literally zip as in .1) however pin 43 was HI and he said LO. ??? I had not checked any information on the aboveso more research. Pin 49 should be chassis ground. Pin 43 Hi is a problem. Does it EVER go Lo on any other band? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
