RE: [drakelist] TR-3 crystals needed (was:TR-3 9 MHz osc & alignment questions)
"Rich Carter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Mark Where did you measure? Pin 6 of V1b? Rich > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mark Pilant > Sent: Sunday, January 20, 2008 5:12 PM > To: [EMAIL PROTECTED] > Subject: [drakelist] TR-3 crystals needed (was:TR-3 9 MHz osc > & alignment questions) > > > Mark Pilant <[EMAIL PROTECTED]> made an utterance to > the drakelist gang > -- > Gary (W8PU) was kind enough to measure the output of the 9 > MHz osc on his TR-4. (The TR-3 and TR-4 are very similar in this > area.) He said he was seeing about 1 V p-p. Looking at the > same place, the signal I saw was about 30 mV. Clearly > something isn't right :-) > > Before I tried injecting a 9 MHz signal from one of my signal > generators, I figured I'd measure the signals with the band > crystals switched in. Here is what I got: > > 40m 21.5 MHz 125 mV > 15m 35.5 MHz 200 mV > 10(1)m 42.5 MHz 500 mV > 10(2)m 43.0 MHz 600 mV > 10(3)m 43.6 MHz 600 mV > > Looking at this, it seems the 10m crystals are OK. However, > the 40m and 15m crystals are off a bit :-) > > So I guess before I can go too much further I need to find: > > 1) 9.00 MHz crystal > 2) 21.5 MHz crystal > 3) 35.5 MHz crystal > > Does anyone have some spares they might be willing to part > with or know where I can get some replacements? > > Thanks in advance. > > 73 > > - Mark N1VQW > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe > drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- > -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] Microphone question
"Peter Bent" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Sorry I am just getting into this conversation. Pull the mike apart and check all the connections, if you haven't done that. Bought a second hand mike from Ebay and although it did not work as advertised with my Drake Tr-7, soldering a broken wire solved the problem and it works like a charm. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Shorney Sent: Sunday, January 20, 2008 5:48 PM To: [EMAIL PROTECTED] Subject: Re: [drakelist] Microphone question "Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sun, 20 Jan 2008 16:36:19 -0500, Eugene Balinski wrote: > >"Eugene Balinski" <[EMAIL PROTECTED]> made an utterance to the drakelist gang >-- >Definitely replace the mic. Look for something with an >impedance of approx 50k ohms (Hi-z). I have seen plenty >of hand mics that will do that. >From the description, the Collins mic he has already has a transformer in it. I wouldn't toss the Collins mic on the heap just yet, there may be a problem in the mic circuit of the radio. It should also be pointed out that measuring DC resistance with an ohmmeter is not the same as measuring impedance. You are only measuring the DC resistance of the wire. This will not provide an accurate measurement of impedance, it will only tell you (in the case of a transformer) which side is high and which is low. To measure the actual impedance, you need to get a little fancier. 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Microphone question
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sun, 20 Jan 2008 16:36:19 -0500, Eugene Balinski wrote: > >"Eugene Balinski" <[EMAIL PROTECTED]> made an utterance to the drakelist gang >-- >Definitely replace the mic. Look for something with an >impedance of approx 50k ohms (Hi-z). I have seen plenty >of hand mics that will do that. >From the description, the Collins mic he has already has a transformer in it. I wouldn't toss the Collins mic on the heap just yet, there may be a problem in the mic circuit of the radio. It should also be pointed out that measuring DC resistance with an ohmmeter is not the same as measuring impedance. You are only measuring the DC resistance of the wire. This will not provide an accurate measurement of impedance, it will only tell you (in the case of a transformer) which side is high and which is low. To measure the actual impedance, you need to get a little fancier. 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] TR-3 crystals needed (was:TR-3 9 MHz osc & alignment questions)
Mark Pilant <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Gary (W8PU) was kind enough to measure the output of the 9 MHz osc on his TR-4. (The TR-3 and TR-4 are very similar in this area.) He said he was seeing about 1 V p-p. Looking at the same place, the signal I saw was about 30 mV. Clearly something isn't right :-) Before I tried injecting a 9 MHz signal from one of my signal generators, I figured I'd measure the signals with the band crystals switched in. Here is what I got: 40m 21.5 MHz 125 mV 15m 35.5 MHz 200 mV 10(1)m 42.5 MHz 500 mV 10(2)m 43.0 MHz 600 mV 10(3)m 43.6 MHz 600 mV Looking at this, it seems the 10m crystals are OK. However, the 40m and 15m crystals are off a bit :-) So I guess before I can go too much further I need to find: 1) 9.00 MHz crystal 2) 21.5 MHz crystal 3) 35.5 MHz crystal Does anyone have some spares they might be willing to part with or know where I can get some replacements? Thanks in advance. 73 - Mark N1VQW -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Close, but not quite. True, the G3 is brought out to Pin 8 in the 6JB6, and that socket pin IS grounded in the T-4 However, in the 6GJ5 G3 is brought internally to the cathode Pin _3_. There is NO connection to Pin 8 in the 6GJ5. Simple! :-) The tube manuals all say Pin 8 is "IC" for Internal Connection, but after looking at many 6GJ5s of various brands, I have yet to find one with anything connected to Pin 8. There may be one, but so far 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs EP Swynar wrote: "EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sunday 20th January, Garey wrote... "...Bottom line is, the 6GJ5 works just fine in the T/TR-4(any) with the same caveats as the 6JB6, i.e., not ALL brands work well..." *** Hi Garey, Many thanks for that FB note... However, I must say, I still remain skeptical and confused (both!) by the notion of employing a 6GJ5 tube as a direct replacement for the 6JB6 in the T4X transmitter... Specifically, because pin #8 in the rig is directly connected to ground, and in the 6GJ5 the suppressor grid is connected directly to the cathode internally AND both the cathode & suppressor come out at pin #8 in that tube, wouldn't you effectively have the finals in constant "key down" mode with the substitutes plugged in...? As well, you'd have no cathode/"plate" current meter readings, either --- correct? What have I missed here...? I dearly DO want to be a believer, but there must be some Missourian doubting Thomas deep within me! Hi Hi. That, or my proverbial enquiring mind just "NEEDS to know"... ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Re: TR-3 Meter
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Jim - Fairly common with plastic cased meters. The polystyrene plastic case becomes charged with static electricity and deflects the pointer. Obviously it's worst in dry winter conditions, just like walking across the carpet in your socks! Often just "breathing" on it will be enough to discharge it. The dryer sheet or detergent method lasts considerably longer. A humidifier on your furnace will help too, but considerably more expensive!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Jim Theisen wrote: Jim Theisen <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Gary I tried the static cling cloth option you mentioned on the TR-3 PI meter, the meter seemed to work much better. Is this just an odd deal or is it a common occurrence. Will this fix the problem or will it eventually quit working at later date. Thanks for the helpful tip Jim Garey Barrell wrote: Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Jim - It may just be suffering from "static cling". Try wiping the plastic lens with a dryer sheet or a paper towel with a tiny drop of liquid detergent on it. If not, I may have one here. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Microphone question
"Eugene Balinski" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Definitely replace the mic. Look for something with an impedance of approx 50k ohms (Hi-z). I have seen plenty of hand mics that will do that. Alternately, you can wire in an impedance transformer on a low-Z mic. Radio Shack used to carry them. I believe that Bob Heil has them also. 73 Gene K1NR On Sun, 20 Jan 2008 09:25:56 -0500 "Rich Carter" <[EMAIL PROTECTED]> wrote: > > "Rich Carter" <[EMAIL PROTECTED]> made an utterance > to the drakelist gang > -- > > Mike > I'll take your suggestion and replace the mic. > > Thanks > Rich > > > > -Original Message- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Mike > Williams > > Sent: Sunday, January 20, 2008 7:51 A > > To: [EMAIL PROTECTED] > > Subject: Re: [drakelist] Microphone question > > > > > > Mike Williams <[EMAIL PROTECTED]> made an utterance > to the > > drakelist gang > > > -- > > Just a suggestion Rich; try a Shure 444 or D104 > (without the > > preamp) on your TR-3. This radio and the 4 line have a > High > > Z mic input. You will get good results with either of > these > > 2 mic's although there are a myriad of others that will > fill > > the bill as well. > > > > Good DX! > > > > Mike W4DL > > > > Ron Wagner wrote: > > > > > > Ron Wagner <[EMAIL PROTECTED]> made an utterance to the > drakelist gang > > > > > > -- > > > Rich, > > > It has been a while since I had my TR3, but I do > remember > > that a 600 > > > ohm hand mic I had tried was not good match for the > rig. I would > > > guess 2K ohms would be in the ball park. They were > made in > > the days > > > of high impedence mics. > > > > > > As far as getting only a few watts out, how are you > > measuring that? > > > Most watt meters I have seen (unless they are peak > reading) > > only show > > > a few watts of RF on the Drakes while measuring SSB. > > > Drakes are not > > > using compression, so they have a very large peak to > average power > > > ratio. What that means is that unless the meter is > > designed to read > > > peak power, it will show a very low average power. > Average power > > > being what most meters read. My TR7 typically shows > about > > 5 watts on > > > my Drake MN4 watt meter. And I know that on a peak > watt > > meter I have > > > ~200 watts going out. > > > > > > One last thing, on AM it will also show low power. > Drakes use > > > controlled carrier AM. That is the carrier changed > as you spoke. > > > What that does is lower the heat on the finals. The > TV sweep tubes > > > were designed for high peak, low average power. If > you ran > > them any > > > other way, you wore them out very quickly. Ideal for > > > uncompressed SSB > > > service, not so good for other service. > > > > > > Hope this helps. > > > > > > 73, > > > Ron WD8SBB > > > > > > On Sat, 19 Jan 2008, Rich Carter wrote: > > > > > >> The mic came with the rig. I assume they should > work > > together. The > > >> mic seems to work, but it doesn't have enough drive > for > > the radio. I > > >> only get a couple of watts out for SSB if I yell > into the > > mic. The > > >> problem could be in the rig, but I thought it best > to > > check the mic > > >> first. I opened it up. > > >> There's a 4 ohm microphone element and a matching > transformer that > > >> says BT3 > > >> 001 on it. I can find no specs for the mic. What > is more > > >> frustrating is there appears to be no information > about what the > > >> drake transceiver wants for mic impedance. I don't > have > > any matching > > >> transformers in my spare parts bin. Before I run > out > > there and buy > > >> some parts, I thought it best to see if anyone knows > what the heck > > >> the rig wants. > > >> > > >> Thanks for the reply > > >> Rich > > >> > > >> > > > > > > > > > -- > > > Submissions:[EMAIL PROTECTED] > > > Unsubscribe:[EMAIL PROTECTED] - > unsubscribe > > drakelist in > > > body > > > Hopelessly Lost:[EMAIL PROTECTED] - help in > body of message > > > Zerobeat Web Page: www.zerobeat.net - sponsored by > www.tlchost.net > > > > > > -- > > > > > > > > -- > > Submissions:[EMAIL PROTECTED] > > Unsubscribe:[EMAIL PROTECTED] - > unsubscribe > > drakelist in body > > Hopelessly Lost:[EMAIL PROTECTED] - help in > body of message > > Zerobeat Web Page: www.zerobeat.net - sponsored by > www.tlchost.net > > > ---
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Ooops...! I believe I SHOULD have said that in the 6GJ5 tube, the internally connected "...cathode & suppressor grid come out at pin #3", and NOT at pin #8... No matter: it would STILL place the cathodes of the finals directly to ground, bypassing all of the metering, cathode bias resistors / bypass capacitors, etc., which would simply be left "floating". ~73~ Eddy VE3CUI - VE3XZ *** > However, I must say, I still remain skeptical and confused (both!) by the > notion of employing a 6GJ5 tube as a direct replacement for the 6JB6 in the > T4X transmitter... > > Specifically, because pin #8 in the rig is directly connected to ground, and > in the 6GJ5 the suppressor grid is connected directly to the cathode > internally AND both the cathode & suppressor come out at pin #8 in that > tube, wouldn't you effectively have the finals in constant "key down" mode > with the substitutes plugged in...? As well, you'd have no cathode/"plate" > current meter readings, either --- correct? > > What have I missed here...? > > I dearly DO want to be a believer, but there must be some Missourian > doubting Thomas deep within me! Hi Hi. That, or my proverbial enquiring mind > just "NEEDS to know"... > > ~73~ Eddy VE3CUI - VE3XZ > -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] transceive off RX vs off TX
When I transceive off the RX as opposed to the TX, the RX sig level is significantly higher than when I transceive of the TX. Any ideas ? I am using authentic T4X to R4A cables. Chuck, K1OM, Alachua, FL
Re: [drakelist] Microphone impedence
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sun, 20 Jan 2008 10:21:41 EST, [EMAIL PROTECTED] wrote: >[EMAIL PROTECTED] writes: > >What is more frustrating is there appears to be no information about what >the drake transceiver wants for mic impedance. >Rich, > >My TR4 book says high impedence. In this case, "high impedance" probably means on the order of 50K or more. It should be possible to make an educated guess from the schematic. 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] TR-3 9 MHz osc & alignment questions
Mark Pilant <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Gary. > But to be sure one would need to check the carrier oscillator > frequency with a frequency counter. It should be set very close > to 9 mHz. That is what I attempted to do, when I noticed the 20 mV 9MHz osc signal. (I'm using an HP 53132A counter.) My next attempt is going to be to pull the 6GX6 osc tube and inject a 9 MHz signal from my HP 33120A generator. I'll probably use an attenuator so I can see just what injection signal level is needed. (The 32120A will only go down to 50 mV.) 73 - Mark N1VQW -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Sunday 20th January, Garey wrote... "...Bottom line is, the 6GJ5 works just fine in the T/TR-4(any) with the same caveats as the 6JB6, i.e., not ALL brands work well..." *** Hi Garey, Many thanks for that FB note... However, I must say, I still remain skeptical and confused (both!) by the notion of employing a 6GJ5 tube as a direct replacement for the 6JB6 in the T4X transmitter... Specifically, because pin #8 in the rig is directly connected to ground, and in the 6GJ5 the suppressor grid is connected directly to the cathode internally AND both the cathode & suppressor come out at pin #8 in that tube, wouldn't you effectively have the finals in constant "key down" mode with the substitutes plugged in...? As well, you'd have no cathode/"plate" current meter readings, either --- correct? What have I missed here...? I dearly DO want to be a believer, but there must be some Missourian doubting Thomas deep within me! Hi Hi. That, or my proverbial enquiring mind just "NEEDS to know"... ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] TR-3 9 MHz osc & alignment questions
"Gary Poland" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Rich, If both sides of the filter are good, in SSB mode, you should be able to tune in an AM broadcast and switch between USB and LSB with no real change in the audio response. If there is a substantial change the carrier oscillator is either off frequency or the filter is bad. Crystals in the soup can filter drifting off frequency is a common problem, I have seen a lot of them bad as well as the LSB filter in the TR-4 and TR-4 C. But to be sure one would need to check the carrier oscillator frequency with a frequency counter. It should be set very close to 9 mHz. 73, Gary W8PU http://home.cinci.rr.com/w8pu -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Re: TR-3 Meter
Jim Theisen <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Gary I tried the static cling cloth option you mentioned on the TR-3 PI meter, the meter seemed to work much better. Is this just an odd deal or is it a common occurrence. Will this fix the problem or will it eventually quit working at later date. Thanks for the helpful tip Jim Garey Barrell wrote: Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Jim - It may just be suffering from "static cling". Try wiping the plastic lens with a dryer sheet or a paper towel with a tiny drop of liquid detergent on it. If not, I may have one here. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] L7
Hello all, Back again after the list change. I bought an L7 from someone on the internet last summer. Finally it became clear he wasn't worth such a beauty. I received the L7 with the tubes in place. Guess what... Right, a package full of glass. Now I started to clean the lot up and found the plate capacitor (variable one) damaged seriously (arcing) as well. It would be better to replace this one. Does anyone know where to get one? Thanks in advance! 73's, Evert PA2KW Drake: TR7 / R7 / RV7 / L7 / MN2700 Elecraft: K2-SN4836, K3-SN???
Re: [drakelist] T4-XB problem
"Bill Carpenter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Well, the pot seems to be fine with the voltage moving smoothly from 0 to 1 volt as it should. I'm still seeing the sudden jump from 0 to full power in CW mode only. In tune mode it operates properly. Now what? - Original Message - From: "Garey Barrell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, January 19, 2008 12:00 PM Subject: Re: [drakelist] T4-XB problem Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Bill - I think the only source for a replacement today would be a junker. The AC switches are still available from John Kriner, but I doubt if the pots are. It is just a dual 500k pot, and that's one style that is at least still available. I honestly don't know if both sections are audio (log) taper or not. I kinda think they are. The idea for the alignment is to just detune the "other" side of the transformer while you tune "this" side. So hanging a clip lead would work just as well. They DO have +250 VDC on them! Be sure and keep the plate current low, as if it's too high it makes the peak hard to see. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Bill Carpenter wrote: "Bill Carpenter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Thanks Gary, I'll take a look at R79. If it's bad is there a replacement available? Also while I have the cover off I want to run through an alignment. Is there a better way then the procedure in the manual which has you use a screwdriver to detune the rig? If not would attaching a clip-on test lead work as well as a screwdriver? I can just see myself accidentally grounding something and causing all kinds of smoke and flame. - Original Message - From: "Garey Barrell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, January 19, 2008 10:04 AM Subject: Re: [drakelist] T4-XB problem Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Bill - The CW Gain is a separate section on the GAIN control, R79, along with R76, 77 and 80 form an adjustable DC voltage divider from the +150V regulated supply. The resultant voltage is applied to the balanced modulator to unbalance it and allow the Carrier Oscillator signal to pass through. The frequency of the Carrier Oscillator is also shifted by ~ 900 Hz to allow it to pass through the LSB filter. What you are describing sounds like an open R79 resistance element. It's possible that it's just a bit of crud on the element so a shot of Caig MCL CaiLube or other control cleaner might clear it. You can measure the control voltage at the center conductor of the shielded wire going to T14, just in front of the VOX Delay pot. It should start at 0 and come up as you increase the GAIN control (in CW MODE only) to about 1 VDC. There are two forward biased Ge point contact diodes in series to ground from that point, which will limit the voltage, although the current will continue to increase as you turn up the GAIN control. I'd guess you are going to see 0 V at minimum GAIN, jumping to ~1V when you get to ~9 o'clock on the control. But I've been wrong before! :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Bill Carpenter wrote: "Bill Carpenter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- I installed the AC4R upgrade in my AC4 this week which is a very nice kit. The T4-XB seems to love it and was working extremely well. I spent a couple of hours on 160 SSB last night and made a few CW contacts with no problems on other bands. This morning when I was tuning the transmitter on 80 I noticed that in CW mode that the gain control suddenly had no effect on power out. It goes from no power to full power as the control is advanced at about 9 o'clock very suddenly. There is no gradual increase as there should be. In tune and SSB mode it still works fine with the normal gradual increase. Any ideas on how to begin trouble shooting this? I don't see any obvious burned components - at least not yet. I'm hoping it's a tube and not some hard to find component! 73, Bill NZ0T -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ---
Re: [drakelist] T4X Final RF Tubes
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Eddy - The cathode is "almost" grounded at the socket by a 470 pF cap, (a little feedback for linearization,) then through the 15 ohm cathode resistor to equalize the current between the tubes, and then RF Ground by a 0.005 uF cap. Then it's off through an RF choke for keying and cathode current monitoring, etc., essentially a 3.3 ohm resistor to DC ground. In the T-4(any), G3 is DC grounded at the socket, but in the TR-4(any), G3 is bypassed to the "bottom" of the 15 ohm cathode resistors. Bottom line is, the 6GJ5 works just fine in the T/TR-4(any) with the same caveats as the 6JB6, i.e., not ALL brands work well. The same reliable brands, (Sylvania, Zenith, RCA and GE ALWAYS work,) Westinghouse, Raytheon, Standard and a few of the late term "rebranders" sometimes work. The tube was designed to work at ~16kHz, and only Sylvania actually characterized and published data for use in linear service at 2-30 MHz. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs EP Swynar wrote: "EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Again John, Interesting...! I can't honestly say that I've had the bottom cover off of my "...new/old" T4X here yet, but the schematic in the manual, at least, definitely shows that pin #8 (suppressor grid) of each tube is directly grounded, whilst pin #3 for each is connected to resistors, capacitors, etc., i.e. NO direct ground connection... This merits further investigation on the part of yours truly, Hi. ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Microphone impedence
Mark Pilant <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Rich. > What is more frustrating is there appears to be no information > about what the drake transceiver wants for mic impedance. On page 4 of the TR-4 manual under the transmitter specs it says the mic is high impedance. If I remember correctly, and this is digging back about 35 years or so :-) so take it with a grain (lump?) of salt, low impedance meant 600 ohms or lower and high impedance was anything greater than 1000 ohms. Although most of the hi impedance microphones I remember were on the order of 10K - 15K ohms. Using a mismatched mic will really reduce the signal available. 73 - Mark N1VQW -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] TR-3 9 MHz osc & alignment questions
Mark Pilant <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Gary. > I am getting into the tail end of this conversation but either 1/2 > of the soup can filter is bad or your 9 mhz carrier oscillator is > off frequency. I could believe either. When I feed a modulated (1000 Hz) AM signal from my signal generator into the TR-3, switching between USB and LSB I see different signal strengths. So it might be 1/2 is bad or going. The other anomaly is when I do switch, I have to turn the main dial to get the signal. So this may indicate the 9 MHz oscillator is not quite right. This may be tied to the issue where the amplitude of the 9 MHz signal is only 20 mV P-P. I'm not sure this is enough drive. Looking at the signal on the 'scope, it is also *not* a clean sine wave; as I would expect to see from a crystal oscillator. Still scratching my head. 73 - Mark N1VQW -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Microphone impedence
[EMAIL PROTECTED] writes: What is more frustrating is there appears to be no information about what the drake transceiver wants for mic impedance. Rich, My TR4 book says high impedence. If you go to the Drake musium on line all three of their mic's are shown as accessories, click on the pictures, all specified high impedence, and you get specs, and or service parts available. The one for the 729SRD (looks like an ElectroVoice or an Astatic has/had the matching transformer available, and where to get. All were ceramic 7075, 7077 were the other two, figured you could check. Carl WD8NHK **Start the year off right. Easy ways to stay in shape. http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489
Re: [drakelist] Microphone question
"Richard Arland, W3OSS" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- I second Mike' suggestion. I have both and the Shure 444 works great. The D-104 is on display but still useable if I need it in a hurry. 73 Rich W3OSS | Just a suggestion Rich; try a Shure 444 or D104 (without the preamp) on | your TR-3. This radio and the 4 line have a High Z mic input. You will | get good results with either of these 2 mic's although there are a | myriad of others that will fill the bill as well. | | Good DX! | | Mike W4DL | -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi Again John, Interesting...! I can't honestly say that I've had the bottom cover off of my "...new/old" T4X here yet, but the schematic in the manual, at least, definitely shows that pin #8 (suppressor grid) of each tube is directly grounded, whilst pin #3 for each is connected to resistors, capacitors, etc., i.e. NO direct ground connection... This merits further investigation on the part of yours truly, Hi. ~73~ Eddy VE3CUI - VE3XZ - Original Message - From: "john" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 20, 2008 9:30 AM Subject: Re: [drakelist] T4X Final RF Tubes > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > Exactly, but Drake does that at the socket, so no diff! > > JB > > > At 09:26 AM 1/20/2008, you wrote: > > >"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang > >-- > >Hi John, > > > >Without a base diagram of the 6GJ5 directly in front of me --- and correct > >me if I'm wrong! --- isn't the suppressor grid connected directly to the > >cathode inside of that particular tube...? > > > >~73~ Eddy VE3CUI - VE3XZ > > > > > >** > > > > > > > >- Original Message - > >From: "john" <[EMAIL PROTECTED]> > >To: <[EMAIL PROTECTED]> > >Sent: Sunday, January 20, 2008 9:15 AM > >Subject: Re: [drakelist] T4X Final RF Tubes > > > > > > > > > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > > > -- > > > > > > Eddy > > > > > > Take a look at 6GJ5s ! > > > > > > John K5MO > > > > > > > > > At 08:32 AM 1/20/2008, you wrote: > > > >Good Morning All, > > > > > > > >I'm curious as to the results anyone may have had by substituting 12JB6 > > > >tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... > > > > > > > >Glancing at the filament wiring in the schematic, such a transformation > > > >certainly looks like it'd be easy enough to execute, relatively harmless, > > > >AND simple to return the rig back to "normal" at any future time, should > > > >the need arise. > > > > > > > >I thought I was SO smart here, by convincing myself that a pair of my > > > >spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 > > > >--- until I saw the comparative physical heights between the two, AND > >took > > > >a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi > >Hi > > > > > > > >~73~ Eddy VE3CUI - VE3XZ > > > > > > > > > -- > > > Submissions:[EMAIL PROTECTED] > > > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > > > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > > > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > > > -- > > > > > >-- > >Submissions:[EMAIL PROTECTED] > >Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > >Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > >Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > >-- > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] Microphone question
"Rich Carter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Ron I'm using a Daiwa HF wattmeter on the peak setting. While I realize the meter should show a low reading, I would expect that a I should need to reduce the RF gain from max to prevent overdriving the rig. Since the rig lacks speech compression, I don't know what I should measure, but I would expect a 300W rig to drive at least 10W or or more. What do others see on their meters? It seems to me that the collins mic I have is not matched properly. I have my hands full alignment issues. It may be best for me to replace the mic with something that is known to work with this rig. Rich - KE1EV > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wagner > Sent: Sunday, January 20, 2008 7:37 AM > To: [EMAIL PROTECTED] > Subject: RE: [drakelist] Microphone question > > > Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > Rich, > It has been a while since I had my TR3, but I do remember > that a 600 ohm hand mic I had tried was not good match for > the rig. I would guess 2K ohms would be in the ball park. > They were made in the days of high impedence mics. > > As far as getting only a few watts out, how are you measuring > that? Most watt meters I have seen (unless they are peak > reading) only show a few watts of RF on the Drakes while > measuring SSB. Drakes are not using compression, so they > have a very large peak to average power ratio. What that > means is that unless the meter is designed to read peak > power, it will show a very low average power. Average power > being what most meters read. My TR7 typically shows about 5 > watts on my Drake MN4 watt meter. > And I know that on a peak watt meter I have ~200 watts going out. > > One last thing, on AM it will also show low power. Drakes > use controlled carrier AM. That is the carrier changed as > you spoke. What that does is lower the heat on the finals. > The TV sweep tubes were designed for high peak, low average > power. If you ran them any other way, you wore them out very > quickly. Ideal for uncompressed SSB service, not so good for > other service. > > Hope this helps. > > 73, > Ron WD8SBB > > On Sat, 19 Jan 2008, Rich Carter wrote: > > > The mic came with the rig. I assume they should work > together. The > > mic seems to work, but it doesn't have enough drive for the > radio. I > > only get a couple of watts out for SSB if I yell into the mic. The > > problem could be in the rig, but I thought it best to check > the mic first. I opened it up. > > There's a 4 ohm microphone element and a matching transformer that > > says BT3 > > 001 on it. I can find no specs for the mic. What is more > frustrating > > is there appears to be no information about what the drake > transceiver > > wants for mic impedance. I don't have any matching > transformers in my > > spare parts bin. Before I run out there and buy some > parts, I thought > > it best to see if anyone knows what the heck the rig wants. > > > > Thanks for the reply > > Rich > > > > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe > drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- > -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Need on-off switch R4B
Thank you for the information. I have a little of both I.e. Some corrosion but also some dust and dirt. Guess I'll break out the swabs!! 73 Lew K1NDV ---Original Message--- From: [EMAIL PROTECTED] Date: 01/18/08 14:51:25 To: [EMAIL PROTECTED] Subject: Re: [drakelist] Need on-off switch R4B [EMAIL PROTECTED] writes: Also, could use suggestions on best ways to clean the chassis. Thanks-73 Lew K1NDV Hi, Can't help with the switch. By cleaning do you mean dust & dirt removal ? If so rubbing alcohol, or denatured alcohol and Q-tips. Others recommend Windex on paper towels. Keeping the tube lettering on is a job. I you are referring to rust coming through the very thin copper plating and ergo the steel rusting, have only seen one done (in pictures) and that was massively taped off, primed and painted with a copper paint. 73's & good luck Carl WD8NHK Start the year off right. Easy ways to stay in shape in the new year.
RE: [drakelist] TR-3 9 MHz osc & alignment questions
"Rich Carter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Gary I'm chasing a similar problem. If the SSB filter is bad, would you be able to tell by listening to an AM broadcast signal using both USB and LSB? If the premixer band crystals are slightly off frequency, would this cause similar behavior? Rich KE1EV > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Gary Poland > Sent: Sunday, January 20, 2008 8:13 AM > To: [EMAIL PROTECTED] > Subject: Re: [drakelist] TR-3 9 MHz osc & alignment questions > > > "Gary Poland" <[EMAIL PROTECTED]> made an utterance to > the drakelist gang > -- > Mark, >I am getting into the tail end of this conversation but > either 1/2 of the soup can filter is bad or your 9 mhz > carrier oscillator is off frequency. > > 73, Gary > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe > drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- > -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
john <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Exactly, but Drake does that at the socket, so no diff! JB At 09:26 AM 1/20/2008, you wrote: "EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: "john" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > > Eddy > > Take a look at 6GJ5s ! > > John K5MO > > > At 08:32 AM 1/20/2008, you wrote: > >Good Morning All, > > > >I'm curious as to the results anyone may have had by substituting 12JB6 > >tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... > > > >Glancing at the filament wiring in the schematic, such a transformation > >certainly looks like it'd be easy enough to execute, relatively harmless, > >AND simple to return the rig back to "normal" at any future time, should > >the need arise. > > > >I thought I was SO smart here, by convincing myself that a pair of my > >spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 > >--- until I saw the comparative physical heights between the two, AND took > >a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi > > > >~73~ Eddy VE3CUI - VE3XZ > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: "john" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > > Eddy > > Take a look at 6GJ5s ! > > John K5MO > > > At 08:32 AM 1/20/2008, you wrote: > >Good Morning All, > > > >I'm curious as to the results anyone may have had by substituting 12JB6 > >tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... > > > >Glancing at the filament wiring in the schematic, such a transformation > >certainly looks like it'd be easy enough to execute, relatively harmless, > >AND simple to return the rig back to "normal" at any future time, should > >the need arise. > > > >I thought I was SO smart here, by convincing myself that a pair of my > >spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 > >--- until I saw the comparative physical heights between the two, AND took > >a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi > > > >~73~ Eddy VE3CUI - VE3XZ > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: "john" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > > Eddy > > Take a look at 6GJ5s ! > > John K5MO > > > At 08:32 AM 1/20/2008, you wrote: > >Good Morning All, > > > >I'm curious as to the results anyone may have had by substituting 12JB6 > >tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... > > > >Glancing at the filament wiring in the schematic, such a transformation > >certainly looks like it'd be easy enough to execute, relatively harmless, > >AND simple to return the rig back to "normal" at any future time, should > >the need arise. > > > >I thought I was SO smart here, by convincing myself that a pair of my > >spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 > >--- until I saw the comparative physical heights between the two, AND took > >a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi > > > >~73~ Eddy VE3CUI - VE3XZ > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: "john" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > > Eddy > > Take a look at 6GJ5s ! > > John K5MO > > > At 08:32 AM 1/20/2008, you wrote: > >Good Morning All, > > > >I'm curious as to the results anyone may have had by substituting 12JB6 > >tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... > > > >Glancing at the filament wiring in the schematic, such a transformation > >certainly looks like it'd be easy enough to execute, relatively harmless, > >AND simple to return the rig back to "normal" at any future time, should > >the need arise. > > > >I thought I was SO smart here, by convincing myself that a pair of my > >spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 > >--- until I saw the comparative physical heights between the two, AND took > >a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi > > > >~73~ Eddy VE3CUI - VE3XZ > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: "john" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes > > john <[EMAIL PROTECTED]> made an utterance to the drakelist gang > -- > > Eddy > > Take a look at 6GJ5s ! > > John K5MO > > > At 08:32 AM 1/20/2008, you wrote: > >Good Morning All, > > > >I'm curious as to the results anyone may have had by substituting 12JB6 > >tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... > > > >Glancing at the filament wiring in the schematic, such a transformation > >certainly looks like it'd be easy enough to execute, relatively harmless, > >AND simple to return the rig back to "normal" at any future time, should > >the need arise. > > > >I thought I was SO smart here, by convincing myself that a pair of my > >spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 > >--- until I saw the comparative physical heights between the two, AND took > >a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi > > > >~73~ Eddy VE3CUI - VE3XZ > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] Microphone question
"Rich Carter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Mike I'll take your suggestion and replace the mic. Thanks Rich > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mike Williams > Sent: Sunday, January 20, 2008 7:51 A > To: [EMAIL PROTECTED] > Subject: Re: [drakelist] Microphone question > > > Mike Williams <[EMAIL PROTECTED]> made an utterance to the > drakelist gang > -- > Just a suggestion Rich; try a Shure 444 or D104 (without the > preamp) on your TR-3. This radio and the 4 line have a High > Z mic input. You will get good results with either of these > 2 mic's although there are a myriad of others that will fill > the bill as well. > > Good DX! > > Mike W4DL > > Ron Wagner wrote: > > > > Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang > > > -- > > Rich, > > It has been a while since I had my TR3, but I do remember > that a 600 > > ohm hand mic I had tried was not good match for the rig. I would > > guess 2K ohms would be in the ball park. They were made in > the days > > of high impedence mics. > > > > As far as getting only a few watts out, how are you > measuring that? > > Most watt meters I have seen (unless they are peak reading) > only show > > a few watts of RF on the Drakes while measuring SSB. > Drakes are not > > using compression, so they have a very large peak to average power > > ratio. What that means is that unless the meter is > designed to read > > peak power, it will show a very low average power. Average power > > being what most meters read. My TR7 typically shows about > 5 watts on > > my Drake MN4 watt meter. And I know that on a peak watt > meter I have > > ~200 watts going out. > > > > One last thing, on AM it will also show low power. Drakes use > > controlled carrier AM. That is the carrier changed as you spoke. > > What that does is lower the heat on the finals. The TV sweep tubes > > were designed for high peak, low average power. If you ran > them any > > other way, you wore them out very quickly. Ideal for > uncompressed SSB > > service, not so good for other service. > > > > Hope this helps. > > > > 73, > > Ron WD8SBB > > > > On Sat, 19 Jan 2008, Rich Carter wrote: > > > >> The mic came with the rig. I assume they should work > together. The > >> mic seems to work, but it doesn't have enough drive for > the radio. I > >> only get a couple of watts out for SSB if I yell into the > mic. The > >> problem could be in the rig, but I thought it best to > check the mic > >> first. I opened it up. > >> There's a 4 ohm microphone element and a matching transformer that > >> says BT3 > >> 001 on it. I can find no specs for the mic. What is more > >> frustrating is there appears to be no information about what the > >> drake transceiver wants for mic impedance. I don't have > any matching > >> transformers in my spare parts bin. Before I run out > there and buy > >> some parts, I thought it best to see if anyone knows what the heck > >> the rig wants. > >> > >> Thanks for the reply > >> Rich > >> > >> > > > > > -- > > Submissions:[EMAIL PROTECTED] > > Unsubscribe:[EMAIL PROTECTED] - unsubscribe > drakelist in > > body > > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > > > -- > > > > -- > Submissions:[EMAIL PROTECTED] > Unsubscribe:[EMAIL PROTECTED] - unsubscribe > drakelist in body > Hopelessly Lost:[EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > -- > -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
john <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to "normal" at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] market value of Sherwood AM filter for R4C
[EMAIL PROTECTED] made an utterance to the drakelist gang -- Charlie, Thanks for your email. Unfortunately I don't have a 6 kc filter for sale/swapping but I'm sure somebody out there does. Maybe try the swap nets too? 73, Evan**Start the year off right. Easy ways to stay in shape. http://body.aol.com/fitness/winter-exercise?NCID=aolcmp0030002489 -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X Final RF Tubes
Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the "stock" 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to "normal" at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough & ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF "cage" of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ
Re: [drakelist] TR-3 9 MHz osc & alignment questions
"Gary Poland" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Mark, I am getting into the tail end of this conversation but either 1/2 of the soup can filter is bad or your 9 mhz carrier oscillator is off frequency. 73, Gary -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Microphone question
Mike Williams <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Just a suggestion Rich; try a Shure 444 or D104 (without the preamp) on your TR-3. This radio and the 4 line have a High Z mic input. You will get good results with either of these 2 mic's although there are a myriad of others that will fill the bill as well. Good DX! Mike W4DL Ron Wagner wrote: Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Rich, It has been a while since I had my TR3, but I do remember that a 600 ohm hand mic I had tried was not good match for the rig. I would guess 2K ohms would be in the ball park. They were made in the days of high impedence mics. As far as getting only a few watts out, how are you measuring that? Most watt meters I have seen (unless they are peak reading) only show a few watts of RF on the Drakes while measuring SSB. Drakes are not using compression, so they have a very large peak to average power ratio. What that means is that unless the meter is designed to read peak power, it will show a very low average power. Average power being what most meters read. My TR7 typically shows about 5 watts on my Drake MN4 watt meter. And I know that on a peak watt meter I have ~200 watts going out. One last thing, on AM it will also show low power. Drakes use controlled carrier AM. That is the carrier changed as you spoke. What that does is lower the heat on the finals. The TV sweep tubes were designed for high peak, low average power. If you ran them any other way, you wore them out very quickly. Ideal for uncompressed SSB service, not so good for other service. Hope this helps. 73, Ron WD8SBB On Sat, 19 Jan 2008, Rich Carter wrote: The mic came with the rig. I assume they should work together. The mic seems to work, but it doesn't have enough drive for the radio. I only get a couple of watts out for SSB if I yell into the mic. The problem could be in the rig, but I thought it best to check the mic first. I opened it up. There's a 4 ohm microphone element and a matching transformer that says BT3 001 on it. I can find no specs for the mic. What is more frustrating is there appears to be no information about what the drake transceiver wants for mic impedance. I don't have any matching transformers in my spare parts bin. Before I run out there and buy some parts, I thought it best to see if anyone knows what the heck the rig wants. Thanks for the reply Rich -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] Microphone question
Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Rich, It has been a while since I had my TR3, but I do remember that a 600 ohm hand mic I had tried was not good match for the rig. I would guess 2K ohms would be in the ball park. They were made in the days of high impedence mics. As far as getting only a few watts out, how are you measuring that? Most watt meters I have seen (unless they are peak reading) only show a few watts of RF on the Drakes while measuring SSB. Drakes are not using compression, so they have a very large peak to average power ratio. What that means is that unless the meter is designed to read peak power, it will show a very low average power. Average power being what most meters read. My TR7 typically shows about 5 watts on my Drake MN4 watt meter. And I know that on a peak watt meter I have ~200 watts going out. One last thing, on AM it will also show low power. Drakes use controlled carrier AM. That is the carrier changed as you spoke. What that does is lower the heat on the finals. The TV sweep tubes were designed for high peak, low average power. If you ran them any other way, you wore them out very quickly. Ideal for uncompressed SSB service, not so good for other service. Hope this helps. 73, Ron WD8SBB On Sat, 19 Jan 2008, Rich Carter wrote: The mic came with the rig. I assume they should work together. The mic seems to work, but it doesn't have enough drive for the radio. I only get a couple of watts out for SSB if I yell into the mic. The problem could be in the rig, but I thought it best to check the mic first. I opened it up. There's a 4 ohm microphone element and a matching transformer that says BT3 001 on it. I can find no specs for the mic. What is more frustrating is there appears to be no information about what the drake transceiver wants for mic impedance. I don't have any matching transformers in my spare parts bin. Before I run out there and buy some parts, I thought it best to see if anyone knows what the heck the rig wants. Thanks for the reply Rich -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
