John,
I agree with Rocco's comments, however, I would add this:
Be sure you are adjusting the passband tuning slugs on the square can at the center rear of the rig. Don't attempt adjustment (yet) of the rack of slugs at the left side of the rig (viewed from the front).
Actual adjustment of the tuning rack should be your last ditch effort. I have aligned /repaired several Drake Recievers in various states of repair (or disrepair) and have never needed to fool around with the rack slugs.
Carl WA7CS
PS:
I've got my new K2 up and running! Just installed the audio filter this morning. Next step is the 100 watt PA mod.
Rocco Lardiere wrote:
John,
First, make certain that you are operating the controls properly - esp the passband tuning and bandwidth - since they interact. Next, check the physical position of the passband tuing knob - sometimes they have been removed/replaced - just a few degrees can make a big difference. See if there is a position that makes sense with regards to opposite sideband suppression - then loosen the setscrew, move the knob (not the shaft) and see if this new position works for all modes, paying attention to the curved lines and dots.
If this does not do the trick, you should align the reciever per the manual, paying particular attention to section 6.4.8. Follow the directions precisely, especially regarding the exact position of the knob with respect to the curved lines on the panel. I have found that every one of the R4 series receivers I have bought required a careful alignment of the passband tuner. The difference after alignment was like magic. Caution - moving the passband tuner slugs is very tricky. They are fragile. The tips can sometimes rotate, but not the actual springy shaft. I use a needle nose plier GENTLY to make sure the shafts are actually rotating (you should be able to see them move in and out as you rotate) and hear the difference in the speaker. Then I use a small alligator clip to grab the tips after the shafts move freely; you could try the alligator clip first to see if does the trick. The alligator clip works pretty well to allow you to adjust the passband tuning properly. You should repeat this several times as needed for consistent results. Warning - the tuning components are fragile and difficult to replace.
The directions in the manual are good, but this is a very challenging part of the alignment for some - read it over several times if you have never done it before.
When aligned, these receivers sound much tighter and are wonderful to listen to. If this alignment fails to produce those results, you might have component problems in the passband tuing section. That can be a real bear.
I am sure others on the list who have tried this alignment would have more to say about the subject.
Good luck.
Rocco N6KN
----- Original Message ----- From: "John_K7FD" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, October 26, 2003 3:27 PM
Subject: [drakelist] R-4B both sidebands...second try
bodyI noticed my first post on this went out in HTML format instead of plain text...oops. Let me try again...
When tuning through a CW signal on the R-4B I am hearing the carrier about equal strength on both sides of center...what is the best procedure to correct this?
Thanks,
John K7FD
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