In article Pine.SUN.3.96.1040527134835.22092A-100000@nyx10,
wrote:
Folks,

I have a VFO/display problem with my Panasonic RF-3100.

However, all of a sudden, I lost the portion of the broadcast 88-108 mhz
FM band. At a point below 95.7 mhz the display turned to 9989.3 and
would not tune lower. Above that frequency the FM band works fine,
as does the full range of all the other bands.

Does it pick up signals and just not display the frequency? Or
does it quit working below that point?

In the first case, it's probably the circuitry that converts the
local oscillator to the digital signal that feeds the display
electronics. (Buzzword: Prescaler). Or the oscillator is weak
and not providing enough signal. (For the second case, the tuning
capacitor the other poster mentioned is a strong possibility).

I had a several similar problems in my similar vintage Kenwood
R-1000. The first case was a poorly aligned filter on the
frequency synthesizer board, the second was a bad connector in
the power supply, and the bandswitch needs a shot of tuner-lube
every five years or so.

Mark Zenier Washington State resident

From: (Mark Zenier)

I had a several similar problems in my similar vintage Kenwood
R-1000. The first case was a poorly aligned filter on the
frequency synthesizer board, the second was a bad connector in
the power supply, and the bandswitch needs a shot of tuner-lube
every five years or so.

The shot of tuner lube has worked on my sony 6800W when it was acting very
similarly.


Michael Bryant, WA4009SWL
Louisville, KY
R75, S800, RX320, SW77, ICF2010K,
DX398, 7600G, 6800W, RF2200, 7600A
GE SRll, Pro-2006, Pro-2010, Pro-76
(remove "nojunk" to reply)

Michael Bryant wrote:

From: (Mark Zenier)

I had a several similar problems in my similar vintage Kenwood
R-1000. The first case was a poorly aligned filter on the
frequency synthesizer board, the second was a bad connector in
the power supply, and the bandswitch needs a shot of tuner-lube
every five years or so.

The shot of tuner lube has worked on my sony 6800W when it was acting very
similarly.

I don't recommend that for his problem.


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In article , starman wrote:
Michael Bryant wrote:

From: (Mark Zenier)

I had a several similar problems in my similar vintage Kenwood
R-1000. The first case was a poorly aligned filter on the
frequency synthesizer board, the second was a bad connector in
the power supply, and the bandswitch needs a shot of tuner-lube
every five years or so.

The shot of tuner lube has worked on my sony 6800W when it was acting very
similarly.

I don't recommend that for his problem.

Yea, I got an email from them saying that it quit halfway down the dial,
so it's in the oscillator tuning.

If the Band switch were the problem, it would affect the entire FM band.
Either causing the FM band to not work at all, or intermittent jumping
between bands.

The band switch, at least in the case of my Kenwood, an etched circuit
board based rotary switch. IMHO, their construction is marginal.
It's very expensive to make a switch with better quality contacts with
this small spacing. Tuner lube, in moderation, will fix these switch
problems, temporarily.

Mark Zenier Washington State resident