Fw: [R-390] Below 8mhz problem

Wed, 23 Jan 2002 08:03:59 -0500

Please note that the voltage measurements I have posted below were taken
with the function switch in STANDBY, as printed in the TM.

Jim

----- Original Message -----
From: "Jim Temple" <[email protected]>
To: <[email protected]>
Sent: Tuesday, January 22, 2002 9:34 PM
Subject: [R-390] Below 8mhz problem

> Hello to the list,
>
> As an update, I have found that E209, before the 1st mixer has low
voltage.
> It should be approx -6.5 volts, and it actually is -.85.  Measured with a
> 1meg resistor it is -.76.
>
> The other RF deck test points have good voltage.
>
> The faint cal signal below 8mhz is the same on all bands below 8mhz.  This
> prevents me from hearing the signal generator signal needed to calibrate
the
> variable IF section.  The cal signal on all bands 8mhz and above is strong
> and loud.
>
> I have received suggestions to:
>
> 1.  Check all the appropriate coils, switches, antenna relay, and anything
> that plugs in or wipes, before the 1st mixer v202, due to corrosion
> suspicions because of the "massacre" origion of the radio.
>
> 2.  Check HR202 crystals, especially 17mhz.
>
> 3.  Inspect circuitry between 1st mixer V202 and 1st crystal oscillator
> v207.
>
> The crystal seems to be OK, because I purchased a spare HR202 with the
> radio.
>
> I have substituted the 6c4 and 5654 tubes V202 and V207 with no change.
>
> Thanks for the suggestions, and tomorrow I will get deeply into the above
> suggestions.  So long for now.
>
> Regards,
>
> Jim
> 73, KF4ICZ
>
>
>
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