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Re: R-4B: Garbled Audio on 40m


 

Ideally, you set the pointer first, then tune in the calibrator, tune for zero beat and set the PBT to 12 o'clock, with the bandwidth at .4.? If it is grossly out of adjustment, that may be difficult.? With the PBT at 12 o'clock and the calibrator at zero beat, you adjust each of the four coils for maximum S meter reading.? Sometimes, a slug is frozen.? The "adjusters" seem to be lengths of piano wire.? You may need to free a stuck adjuster with a little WD40 or Rem Oil.? Be sure to use this sparingly and sometimes, it may take some time for it to wick down to where the wire is supposed to rotate.? Adjustments are pretty sharp.? Switching the bandwidths may help you find the signal if only one slug is off.? All slugs are used in the .4 position and progressively fewer in 1.2 and 2.4.? If you choose to align this, make sure that you carefully follow the procedure.? The rear screw adjustment, especially, can be a pain.

Steve Wedge, W1ES/4

Time flies like an arrow.? Fruit flies like a banana.

Sent with secure email.

On Monday, February 19th, 2024 at 8:27 PM, Lyman via groups.io <forum4ll@...> wrote:

Steve,

Yes, I figured it was somewhat working when tuner is set to 4.8 kHz. Then it was a matter of adjusting it. But those coil adjusters had me stump. I would have never thought they were adjustable. I used a pair of needle nosed pliers to adjust them but I'm still not there. Adjustment is very slow and unresponsive but I can hear the noise get louder or softer. I'll need to get a better meter (an extra digit) to see the change.


Thanks,
--
Lyman Lew
KK6LPW

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