Re: TR-4 - Sideband Selections
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Yes, I checked those.? They all were probably quite close and I tweaked them to make sure.? All three 10M bands are quite close in negative voltages and the frequencies are extremely close to what they should be.? On the scope, I can see the band switch is fiddly-noisy when I switch between the three 10M bands.? I think I need to see if there are any obvious problems with those wafers and maybe clean them just a bit.? I need to recheck if I can get output on the two upper bands now.
Thanks,
Barry - N4BUQ
From: "Steve Wedge, W1ES/4 via groups.io" <w1es@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Wednesday, April 2, 2025 11:49:17 AM
Subject: Re: [DRAKE-RADIO] TR-4 - Sideband Selections
Gary, frequently the problem with the upper 10m bands could be that the xtals aren¡¯t there. If you have all three 10m xtals, look in the alignment section on aligning the three band oscillators (L1, L2 and L5). Set your scope or VTVM on the test point near V1 and adjust each per the manual for peak voltage.?
I just worked on an older TR-4 where the calibrator sounded very rough on all three segments and performance was poor. An adjustment of the 10m coil fixed it all.?
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Wed, Apr 2, 2025 at 11:42, n4buq <n4buq@...> wrote:
Thank you for that attachment.? I'll give it a closer read later but the last five pictures are quite helpful.? I think what I mostly confused myself was that I didn't have a key inserted so switching to some of those positions would automatically cause the rig to transmit.? Plugging in a key resolved that for me but I was still questioning the need to go to "X" for the sideband switch because I [mis]understood that X always implied CW.? Steve's answer and Jeff's document straightened that out for me.? The manual certainly discusses Jeff's explanations but I think Jeff's may be a bit clearer - at least to me.? Thanks again guys!
Now to determine why I don't get any output on the two upper 10M bands.? The oscillator is working for all three (verified by the scope and frequency counter) so something else is amiss.? So much fun with this "new" rig!
Barry - N4BUQ
Sorry, I was thinking T-4X and the TUNE mode..
Attached? is a WA8SAJ article that really explains the TR-4..
73,
Gary
WB6OGD
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