Re: [Drakelist] TR7 Drift
Tony, I don't know if your able to build things yourself. If so, or someone can help you, read this: http://members.ziggo.nl/cmulder/drake.htm#bookmark4 or, more universal (RV7) http://members.ziggo.nl/cmulder/ksbstabi.htm I guess it costs you about 10-20 US$ for the components. Excuses for the minor layout of the website, I'm working on a complete new XHTML/CSS design that comes soon. If you have any questions drop me an e-mail. Carel - PA0CMU. On Sat, 01 Jan 2011 13:49:51 -0500, Richard A. (Tony) Stalls wrote: My TR7 drifts around 100-150 Hz PTO during the first hour. After that it calms down a bit, but it still drifts. I've come up with a couple of potential solutions, but to be truthful, I don't know enough to competently decide if they're what I want. .. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR-7 PBT 10K Pots
Ron, Most common used type of these pots overhere in the Netherlands (Europe?) is the vertical placed (most right picture on my website). How would you like to adjust them when mounted on the back of the PCB? If you can get the other, horizontal mounted, model (left pica) you can give it a try. Carel - PA0CMU. Date: Mon, 1 Feb 2010 02:31:07 -0800 From: wd8...@yahoo.com To: drakelist@zerobeat.net; epy...@indy.rr.com Subject: Re: [Drakelist] TR-7 PBT 10K Pots While poking around my power supply board this weekend with my intermittent TR7, I thought about change out of the pots. I know I hear that you need to not only change the pots, but also move the fixed resistors to the rear. So Is there any reason why you can not just mount the multi-turn pots on the rear of the PCB thereby saving the extra rework effort of also moving the fixed resistors? TNX es 73, Ron WD8SBB --- On Sun, 1/31/10, Joe Pyles epy...@indy.rr.com wrote: From: Joe Pyles epy...@indy.rr.com Subject: Re: [Drakelist] TR-7 PBT 10K Pots To: drakelist@zerobeat.net Date: Sunday, January 31, 2010, 8:07 PM You need one Bourns 1k pot 3296W-1-102LF for the 10 volt adjustment, and 5 Bourns 10k pots 3296W-1-103LF for the passband frequency adjustments. They are $2.19 each at Newark. You also have to move the resistors in between the original pots to the backside of the board. Here is a link to a website that has very good pictures of this. http://members.ziggo.nl/cmulder/drake.htm#bookmark5 73, Joe Pyles KC9LAD At 06:54 PM 1/31/2010, you wrote: Good Afternoon, My TR-7's PBT pots have finally reached the point of failing to maintain the correct frequency for both U/Lsb. I am going to replace all 5 pots when I pull the board and was wondering if anyone has had much luck finding higher quality replacements? I am considering 15-20 turn types if they will fit into the same space as the originals. I'd rather not have to modify the board too much, but would like to hear from anyone who might have tried this. I've looked at Mouser and found some that are close, but figured I'd try this resource first. Thanks. Robb NØRU Woodland Park, CO. -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 _ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] tr-7 readout replacement
Hi Dale, Thanks for the complements. Honour goes to my good friend Rien - PA0TRT, I only placed the info on my homepage. I've never heard of a puller for the DR-7 board. I use this one by pulling the rear side of the board first, after disconnecting all wired connectors. In my TR7 there is enough space to remove the complete board carefully without unfastening the front or other parts. Carel. To: pa0...@hotmail.com Subject: Re: [Drakelist] tr-7 readout replacement Date: Thu, 7 Jan 2010 11:12:37 -0500 From: y...@aol.com Carel interesting site,lots of info. I was looking for the puller for the DR-7 board or something that could be used in its place. 73's dale wt4t -Original Message- From: Carel PA0CMU pa0...@hotmail.com To: Drakelist drakelist@zerobeat.net Sent: Thu, Jan 7, 2010 2:50 am Subject: Re: [Drakelist] tr-7 readout replacement Hi all, For a DIY board extractor, see this: http://members.ziggo.nl/cmulder/drake.htm#bookmark9 Good luck, Carel - PA0CMU From: jshor...@inebraska.com To: drakelist@zerobeat.net Date: Wed, 6 Jan 2010 16:09:18 -0600 Subject: Re: [Drakelist] tr-7 readout replacement On Wed, 06 Jan 2010 11:00:27 -0500, y...@aol.com wrote: I noticed the tool for pulling the board loose...good idea? should not be hard to fabricate,or is there a better way. A classic metal PC slot cover works very well as a puller for the DR-7. 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://radiojim(dot)exofire(dot)net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist Express yourself instantly with MSN Messenger! MSN Messenger= ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist _ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] tr-7 readout replacement
Hi all, For a DIY board extractor, see this: http://members.ziggo.nl/cmulder/drake.htm#bookmark9 Good luck, Carel - PA0CMU From: jshor...@inebraska.com To: drakelist@zerobeat.net Date: Wed, 6 Jan 2010 16:09:18 -0600 Subject: Re: [Drakelist] tr-7 readout replacement On Wed, 06 Jan 2010 11:00:27 -0500, y...@aol.com wrote: I noticed the tool for pulling the board loose...good idea? should not be hard to fabricate,or is there a better way. A classic metal PC slot cover works very well as a puller for the DR-7. 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://radiojim(dot)exofire(dot)net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist _ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 VFO Problem ?
Adrian, Be aware of what is mentioned before by Garey - K4OAH. When changing the pots, the 10V-DC will not be the same voltage as before. Changing that voltage requires a full alignment of the TR7. So, before you start removings the pots, warm up the TR7 for a minute or 10. Than measure the 10V-DC with a digital voltmeter as accurate as possible and write down the value on a piece of paper. After that you can replace the pots and ,after warming up the TR7 again, adjust the 10V-DC voltage to exactly the same value as measured before. After that you can re-align the other pots as described in the manual. This is not a guarantee that the TR7 needs a complete aligment yet, but I think it's the best way to replace the pots. Good luck, Carel - PA0CMU. From: ree...@btconnect.com To: drakelist@zerobeat.net Date: Fri, 18 Dec 2009 09:23:34 + Subject: Re: [Drakelist] TR7 VFO Problem ? Hello all I have the Service Manual and have it printed out. To confirm the symptoms, on 21 and 28MHz the counter settles around 33.030MHz and 17.206MHz on all other bands. Connecting an antenna I can hear my signal generator on thes frequencies (sweeping the generator through the 33 and 17MHz frequencies). With an external source the counter works fine. So the synthesizer doesn't appear to be locking. I have cleaned the Molex connectors. My next course of action is to replace the pots on the voltage control board for multiturn ones, and re-align the voltages etc, and then re-check the synthesizer board again. Thanks all for the help, so far ! Adrian MW1LCR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist _ New Windows 7: Find the right PC for you. Learn more. http://windows.microsoft.com/shop___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
RE: [drakelist] 2nd IF Audio Board in TR7
Carel PA0CMU [EMAIL PROTECTED] made an utterance to the drakelist gang -- Garey - K4OAH wrote: Your link below refers me to your Host's lost page. Perhaps it's referring to a TMP folder on your machine? No Garey, I changed the first three characters to lower case in the link, but the real filename was in uppercase. It is corrected now. Please look again. http://home.wanadoo.nl/cmulder/tmp/dsc02639a.jpg Although the resistors R1187 and R1188 are drawn in my schematic (Service Manual 1978), they were NOT designed on the PC-board. I added them by lifting the diodes on one side. http://home.wanadoo.nl/cmulder/tmp/R1187.jpg http://home.wanadoo.nl/cmulder/tmp/R1188.jpg Carel - PA0CMU. _ De leukste online filmpjes vind je op MSN Video! http://video.msn.com/video.aspx?mkt=nl-nl -- 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] 2nd IF Audio Board in TR7
Carel PA0CMU [EMAIL PROTECTED] made an utterance to the drakelist gang -- Garey, Not only the demodulator circuit was changed. 1. Drake made some minor changes in the S-meter circuit. R1101 is replaced by two 1N4148 diodes in series and CR1101 is replaced by a 4700 Ohm resistor. 2. My first generation board was missing the current limiting resistors R1187 and R1188 (feeding the audio preamps Q and Q1113) causing loud clicks in the speaker when switching to CW and AM mode. 3. R1112 was connected between base and collector of Q1103 in stead of biasing the base from the +10V-DC (pin11/13) line. The effect was a short pulse to the RTx relay when switching to CW mode. All mentioned above is drawn correctly in the first generation schematic Fig. 2-22 2nd IF/Audio Board on page 2-63 of the Service Manual. Unfortunately my board was not build like that. I cannot say the TR7 sounds or performs better after the upgrade to a second generation board. I just replaced the demodulator circuit by a MC1496. Meanwhile I added a switched capacitor audio filter as described on my homepage and placed it on top of the piggy back mounted PC-board holding the MC1496 circuit. Here is a link to one of the pictures I still have to add to the Drake page of my website. http://home.wanadoo.nl/cmulder/tmp/dsc02639a.jpg The upper board is the audio filter with MAX7400. The lower one is the product detector. All build very compact to fit in the compartment just behind the fan connector (changed to a 12V-DC type). That filter is doing a very great job, clearing the high hiss in my headphones when listening CW signals. Carel - PA0CMU http://home.wanadoo.nl/cmulder Date: Thu, 24 Apr 2008 18:58:35 -0400 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [drakelist] 2nd IF Audio Board in TR7 Garey Barrell made an utterance to the drakelist gang -- David - I just had this conversation the other day...! :-) I don't think anyone knows for sure, but I believe the AF board change was made around s/n 6000 or so. Early 1980. According to Bill Frost, the 1496 was originally designed into the R-7, and was then adopted as a cost saving measure in the second generation TR-7. The IC replaced a hand wound toroid and a couple of alignment problems. It's pretty easy to spot in a TR-7, as it's right at the top right corner of the 2nd IF/AF board at the rear of the card cage. Version 1 has the toroid up there and a little U-shaped shield (yet another costly item not needed with the IC) while the Version 2 board has the IC and a few resistors. Personally, I doubt if you would notice the difference by ear. I have a couple of each, and can't say that I can hear the difference. Yeah, the 1496 has a wider dynamic range than the two diode PD, but the AGC kinda eliminates the advantage of wide dynamic range! I think it was purely cost saving, and a fancier set of specs couldn't hurt! :-) A dutch ham did a conversion by removing all the parts associated with the Version 1 and putting the 1496 on a small piece of perfboard mounted just above the original board. I'm sure we'll hear other opinions!! :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs -- _ Probeer Live Search: de zoekmachine van de makers van MSN! http://www.live.com/?searchOnly=true -- 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] Audio filter for TR7
Hi all,To improve the audio response of the TR7, Rien PA0TRT designed a switched capacitor lowpass filter using Maxim's MAX7400.You can read all about it on the Drake page on my website.For a direct link:http://home.wanadoo.nl/cmulder/drake.htm#bookmark7Some pictures of the filter will be added soon.73,Carel - PA0CMURien - PA0TRT _ Jouw nieuws: wereldnieuws! Beleef 't op MSN.nl http://reporter.msn.nl/
RE: [drakelist] DF4NW preamp for TR7?
Carel, PA0CMU [EMAIL PROTECTED] made an utterance to the drakelist gang -- Gerry and gang, The URL in your email is not correct and causes a 404 error. The correct link is: http://home.wanadoo.nl/cmulder/drake.htm or just use http://home.wanadoo.nl/cmulder/index.htm to enjoy the QRP related info of my website if you wish. Rien, PA0TRT does not have a personal website, so we used my webspace with a separated Drake page to put our info on the net. Carel - PA0CMU. -- Submissions:drakelist@www.zerobeat.net 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] URL website (continuation)
Carel, PA0CMU [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi all, I just saw that the access to my homepage is denied by the provider. An 'Error 403 page' is shown in stead of my website. There has been to much data traffic and the limits are reached now. I don't know why this happened and will ask the service desk of my provider coming Monday. This is the first time it happens. Please try it again after 02.00 UTC when the freezing will be removed (I hope). Sorry for that. Carel - PA0CMU Send -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] URL website (mirror site)
Carel, PA0CMU [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi all, Due to limited ammount of traffic that is allowed for my website, I asked my son to set up a mirror of my main website (which is located at http://home.wanadoo.nl/cmulder/). If the main website mentioned above is not accessible, please visit the mirror at http://muldereric.mine.nu 73, Carel - PA0CMU -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] URL website
Carel, PA0CMU [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi all, If you have visited the Drake forum during the Hamvention in Dayton, you might not have a solid copy of the callsign pointing to my website where you can find our (PA0CMU and PA0TRT) mods for the Drake TR7. I had to repeat my callsign at least four times, so here it is again: Using Google, type: PA0CMU (first hit) or, http://home.wanadoo.nl/cmulder Please leave a message in the guestbook or via the Callsign box in the left frame on the mainpage, if the info was valuable for you. Carel - PA0CMU. -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
RE: [drakelist] R4C DC Power supply Board
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Kevin, I should have one spare somewhere because I improved the power supply unit and the audio amplifier. Consider that improvement as developed by Howard Sartori, W5DA to reduce heat and better filtering. Read this info: http://www.mods.dk/view.php?ArticleId=2551 Carel - PA0CMU. _ Gebruik MSN Webmessenger op je werk en op school http://webmessenger.msn.com/ -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] TR-7 Receiver Noise
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi Dieter and group, Unfortunately, I don't remember which transistor it was. It most likely was located on the 2nd IF / Audio board. It is Q1113 a 2N3904 (the last stage before the audio IC) who caused a same kind of noise and rumble in the TR7A of PA3AJI. The replacement is a BC549, a low noise type transistor. Carel - PA0CMU. _ MSN Zoeken, voor duidelijke zoekresultaten! http://search.msn.nl -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
RE: [drakelist] TR-7 Receiver Noise
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hello Vic, It might be the powerline wiring from the on/off switch on the front panel to the connector on the rear panel. The 60 Hz /110V signal introduces a hum in the audio circuits. We modified the PS-7 by mounting a switch on the frontpanel and disabled the original on/off switching. Due to that, the PA fan must be replaced too. We used a cheap 12V computer fan. Now you can use your TR7 with forced cooling in the field too! 73, Carel - PA0CMU. From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: [drakelist] TR-7 Receiver Noise Date: Tue, 07 Dec 2004 16:04:27 + [EMAIL PROTECTED] made an utterence to the drakelist gang -- Greetings. I recently put a TR-7 on the air that I purchased several months ago. All is fine except that there is what I can best describe as a low frequency rumble noise that is most noticable when using headphones. It is very audible even with the RF gain set to max and the audio gain set to min. I have listed with another receiver and do not hear this noise, so I don't think I have any interference in the shack. When tuning in signals, there does not appear to be any distortion, but the background noise is very noticable. Any suggestions greatly appreciated. Vic K5TAG -- On Behalf of [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ -- _ MSN Zoeken, voor duidelijke zoekresultaten! http://search.msn.nl -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
RE: [drakelist] TR-7 Receiver Noise
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Vic, Try this: - disconnect the AC-line! - remove the PS7 control cable on the rear panel of the TR7 - make a temporary connection with a piece of wire between pins 1 and 2 of the PS7 control cable connector. The PS7 is switched to ON mode now. - carefully connect the AC power - the TR7 is switched ON too, but without the AC current through the wires in the rig. - don't use transmit mode because the fan doesn't work either! - listen to the noise you heard before. If it's gone now, the AC wiring in the TR7 is the reason of your unwished signal. Good luck, be carefull, AC power lines are dangerous. Here in the Netherlands we even have 230V. Carel - PA0CMU. _ Nieuw: Hotmail Medium, Large, Extra Large en Extra Extra Large http://join.msn.com/?pgmarket=nl-nlpage=hotmail/es2 -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] TR7 mode switch thump. PROBLEM FOUND
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi all, The problem of the mode switch thump has been found. On the early version of the 2nd IF/Audio Board, R1187 doesn't exist. On the late version board Drake added R1187 (10K) in series with CR1119 but made a mistake in the copper trace design. In some (or most ?) cases, R1187 is short-circuited! Switching to CW mode still charges C1151 (22uF/16V) immediately through CR1119, thus giving a loud click in the audio circuit. I added a 10k resistor to my early version board and Rien - PA0TRT, modified the copper trace of his late version board. Both TR7's (S/N 3157 and 9345) are switching without any click to CW mode now. 73, Carel - PA0CMU. _ Ontvang Hotmail Messenger op je mobiele telefoon http://mobile.msn.com/?lc=nl-nl -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] Language correction (TR7 mode switch ...)
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Oep... In my message about the TR7 mode switch problems, I used the word thumb instead of thump or click. Sorry for the mistake. Carel - PA0CMU. _ MSN Zoeken, voor duidelijke zoekresultaten! http://search.msn.nl -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] TR7 mode switch thumb
Carel, PA0CMU [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi all, From the estate of a friend, PA3BBT, I got a TR7 (serial no. 3157) and PS7. All his amateur equipment was kept in boxes for nearly seven years and needed a serious cleaning. Two of my friends do have a TR7(serial no. 7???) and TR7A (serial no. 11178) too, so we can compare differences between the rigs. Both TR7's produce a fairly loud thumb in the speaker when turning the mode switch to CW, regardless one switches from RTTY to CW or from LSB to CW mode. The same thumb appears when the AM mode is selected. The TR7A on the other hand, produces a smooth, thumbless switching between all modes. Despite all internet info we could not find any modification for this fault. Does anyone have some info on that? Is it a bug, or just normal for the TR7. In my TR7 the first low pass filter (L1701 - L1702) is omitted, but in the other TR7 and TR7A all components are mounted. Does anyone know the values and toroid material of L1701 and L1702? We also found out that there is missing a copper trace on the noise blanker PCB. The connection between pin 1 of the MC1350 and L812 is omitted on both available NB boards! One of the noise blankers didn't work (never did?) but was fine after placing about 5mm copper wire between both pads. 73, Carel - PA0CMU. _ Hotmail en Messenger on the move http://mobile.msn.com/?lc=nl-nl -- On Behalf of Carel, PA0CMU [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
