[Kenwood] TS-520 VFO prob's

[k8vf_mark at centurytel.net]

Check www.mods.dk

I believe this rig is one of those with the "loss of ground"  syndrome which 
was cured by adding star washers to the grounds on the VFO board.

I may not be correct, but I believe this is the case.


Best of luck

K8VF

----- Original Message ----- 
From: "J. Michael Thurman" <jmthurman at centurytel.net>
To: <Kenwood at mailman.qth.net>
Sent: Saturday, July 29, 2006 1:01 PM
Subject: [Kenwood] TS-520 VFO prob's


> Greetings,
>
> I have a TS-520 that has started show some odd VFO instability.   The VDC 
> going in is a steady 9 V.  The VAC coming out is steady.  However, at 
> times the frequency will fluctuate up to 50 kHz up and down.   Yes, it is 
> intermittent.  Some times is does it as soon as I turn it on...only to 
> settle down...and then act up again.  Some times it is steady until I key 
> the rig.
>
> So, any of you that have seen this, is it more likely that the capacitors 
> in the VFO have degraded or the transistors?   What did you find?
>
> My next step to pull the VFO and check internal voltages and check cap 
> values.  Hopefully, it will decide to act up while I'm looking at it.
>
> 73 and TIA,
> de WN5T
>
> Michael
>
>
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