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Re: TR-4C(W) Improved Amplitude Modulation
IF? you are going to RX? AM,? use the fastest AGC? available.? ?Then zero issues when selective fading on 40m comes along.? Zero issues when listening to anyone who is transmitting CC AM modulation, like the drakes use. IF ur? agc is fixed....and way too slow, it's dead simple to speed it up a little, or a lot.? ? It's also easy to use a 500k? / 1 megohm pot? ?+ cap? to make a fully adjustable RC / agc? setup.? ?? |
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Speaking of those switch schematics...
Good afternoon, Drakesters! I'm currently working on an early T-4 Reciter that I got in a swap late last year.? My R-4A and T-4X are working and can work together but I thought it would be different to use the T-4 for my A Line setup on the operating bench. The problem is that the T-4 was initially working in CW, TUNE and SSB but now only works in CW, where I am getting decent output from a wildly mismatched (in appearance, anyway) set of 6JB6's.? I've decided not to worry about them, as I'm able to get over 100W out on 20 and about 70W on 10. Yesterday, I started trying to troubleshoot when I suddenly lost TUNE and SSB.? I seem to remember that the two are related -- that TUNE is created by putting a constant tone through the mic amp (V9).? I have checked the resistors, both hot and cold and they're within spec.? Voltages on V9 are close to the chart values.?? The diodes around this circuit all measure around 0.5V forward and open reverse-biased. The rotary switch has had DeOxIt applied, sparingly. At first, I thought this was a heat-related issue but it still wouldn't work earlier this morning, after an overnight period to cool down. Any suggestions? 73, Steve Wedge, W1ES/4 Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
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Re: TR-4C Large Size Schematic Availability
John K5MO,
Concerning the interpretation of rotary switches, see note one: all rotary switches are show in the extreme CCW position. ?The dotted line is connected to the switch title showing the function of all positions, shown in the extreme CCW position. ?There is typically one wiper per switch segment and there may be multiple segments in each pole of the switch. ?The dotted line indicates the mechanical connection between the knob and all the poles; there may be many poles. ?You can thick of it electrically as a multipole¡ªmulti-throw switch. Michael, N4KZO |
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Re: TR-4C Large Size Schematic Availability
Here ya go. Now please drop it.
From: "Doug Renwick" <ve5ra@****.****> 73 -Jim NU0C On Wed, 6 Jul 2022 21:53:21 -0500 "Jim W7RY via groups.io" <jimw7ry@...> wrote: Hey Doug... Guess? what... |
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Re: TR-4C Large Size Schematic Availability
Jim W7RY
¿ªÔÆÌåÓýHey Doug... Guess? what...
Your callsign doesn't show up anymore... Hmmmm..
Jim W7RY
On 7/6/2022 8:26 PM, scott via
groups.io wrote:
On Tue, Jul 5, 2022 at 08:53 PM, Doug Renwick wrote: |
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Re: TR-4C Large Size Schematic Availability
On Tue, Jul 5, 2022 at 08:53 PM, Doug Renwick wrote:
Scott AA4HG
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Re: TR-4C(W) Improved Amplitude Modulation
Rick WA6III
Michael,
I am not all that familiar with the older Drake transmitters (T-4, T-4X) but based on some complaints I have read about,? it appears that Drake may have intentionally set them up to produce a very low (2-5w)? un-modulated carrier power output.? I have no doubt that would have caused noticeable fluctuation effects at the other end in receivers,? AGC on or off. I am pretty sure they intended the T-4XC to put out a little more power. Mine has done somewhere around 12-13w since it was new (& I know this because I bought my C-line new in the mid 70's) So they must have intended to increase it in newer models. I cannot say the same about my TR-4C (that also does about 12-13w carrier output) because I didn't buy it new.? Someone could have modified it over the many years before I got it. But I can say categorically that around 12W works seamlessly and most don't notice I am using Carrier Control unless I mention it. As far as the receive selectivity of the TR-4C goes, I think it would only be a problem if 2 people were talking back and forth using TR-4's with SSB filters.? Each station might be constantly tuning to get the best fidelity in received audio.? It would be a good test I suppose. I too have corresponded with Nobel.? I would LOVE them to produce slightly wider filters for the T-4X transmitter series and TR-4 transceivers. Installing the INRAD 2.5kHz filters in my TR-4C made BOTH the receive and transmit audio much more pleasing to listen to. I think I got one of the last filter sets for the TR-4 from INRAD.....? evidently they're not available anymore. -- 73/RickWA6III |
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Re: R-4C filters and Power Supplies
If you hit the dollar sign on the keyboard but it doesn¡¯t shift, you get a ¡°4¡± - thus ¡°4150¡± is most likely $150 with a computer ¡°attitude¡± superimposed¡¡.sometimes they just get persnickety¡¡. Hank WM1V? On Tue, Jul 5, 2022 at 7:52 PM K4GM-George <k4gm@...> wrote:
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Re: Box of Tubes and Parts Available, Drake-4 Line
#ForSale
Mark Murray
Guys,
REgarding the ad from yesterday, Sorry about that un-working QRZ Email address ... that being the ARRL.net address, for W2OR.? The boys in Newington, CT said they're working on it. As of today, 6 July, a new Email address now appears on QRZ.? Thanks. The Drake-4 Line parts and nine 6JB6 tubes, mentioned in the original ad, are still available.? There are now a few photos of the parts, seen now on the Groups.io "Photos" tab.? ? I'm not a Drake owner, and am unfamiliar with prices (other than EBay), so please, send an email, and just make a reasonable offer.? Thank you. p.s. for George2:? Yes, I'm new to this Group.? Yes, my callsign did appear in the original ad.? ~~ ~~ ~~? Signature ~~ ~~ ~~ 73 de Mark ..w2or.. New?EMail Address is now on QRZ.com as of 6 July 2022 |
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Re: TR-4C Large Size Schematic Availability
I have a huge blowup of the drake schematic for the TR4C here (2'x3' or so). The scan that's in Garey's disks have enough resolution to be useful at this size. John K5MO PS:
I wish Garey had done a dissertation on how to interpret Drake rotary switch schematic representation!
On Wed, Jul 6, 2022 at 10:53 AM Michael Smith via <tw8kcabpilot=[email protected]> wrote: All, |
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Re: TR-4C(W) Improved Amplitude Modulation
Rick,
Your report is very useful. ?An un-modulated carrier of 10 W appears to be a good value; I hope to check the resting carrier level in the TR-4CWRIT soon. ?As you say, the unmodulated carrier can be adjusted, if necessary. ?Noting that I have RIT, the wandering stations are not such a problem, but I may need to adjust frequently. ?I can use the 2-B, if desired. ?I¡¯ve ask Noble Radio to design filters for the TR-4CW.? Frank said that he had many requests for this, and is on his list of things to do, last I spoke with him about a year ago; I expect he has been busy. ?I can connect the L-7 if more power is needed. Thank you. 73, Michael, N4KZO |
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Re: L7 Amp meter needed
On 7/6/22 6:36 AM, Jim Altman wrote:
I can use paint to C&P the background color over the needle and theI use for all my meter faces. I highly recommend it, and suggest you pay for it as well. -- "I am a river to my people." Jeff-1.0 WA6FWI www.foxsmercantile.com |
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Re: L7 Amp meter needed
I have found an 83T meter on ebay and invested $25 in it.? I am not really sure its an appropriate movement as the face says 50 MV, not the 200 uA.? Hopefully its right or I can use a shunt resister with it.? I have a picture of the face, but do not have photoshop.? I can use paint to C&P the background color over the needle and the Avery label is a great idea for what to print it on. Hopefully next week i can get the amp on the bench to see what else might be broken.? I assume there are other problems which is what took out the meter in the first place. I'll probably start checking voltages and such before i put the meter in lest i just blow up another one.
Thanks guys, I appreciate the help and thoughts. 73? Jim |
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Re: TR-4C Large Size Schematic Availability
Jim W7RY
¿ªÔÆÌåÓýAMEN AMEN AMEN Doug!
And no, your call is NOT in your email address.... Because they
are hidden from the posts..... And thanks for trying 73, Jim W7RY
On 7/5/2022 7:53 PM, Doug Renwick
wrote:
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Re: TR-4C Large Size Schematic Availability
¿ªÔÆÌåÓýI wish, I wish, I wish folks would include the post they are replying to. ? Doug/callsign in e-mail address ? Free Climbing - The ultimate test of strength and technique. From:
[email protected] [mailto:[email protected]] On Behalf Of scott via groups.io ? Hi Stan, |
Jim Shorney
MIke Stover