[Boatanchors] Viking II Modulation Problem

[Carl]

I thought the serial # designated that, maybe thinking of another rig.

Cant help any deeper as mine is a CDC model (only came factory wired) plus I 
completely redid the modulator.

Carl
KM1H



----- Original Message ----- 
From: "Richard W. Solomon" <w1ksz at earthlink.net>
To: "Carl" <km1h at jeremy.mv.com>; "Al Parker" <anchor at ec.rr.com>; 
<boatanchors at mailman.qth.net>
Sent: Saturday, October 10, 2009 2:03 PM
Subject: Re: [Boatanchors] Viking II Modulation Problem


> Don't know if it was factory built or a kit, but the physical
> circuitry matches the schematic in the manual.
> Beyond that, my Xtal Ball gets cloudy !!
>
> 73, Dick, W1KSZ
>
> -----Original Message-----
>>From: Carl <km1h at jeremy.mv.com>
>>Sent: Oct 10, 2009 1:53 PM
>>To: Al Parker <anchor at ec.rr.com>, "Richard W. Solomon" 
>><w1ksz at earthlink.net>, boatanchors at mailman.qth.net
>>Subject: Re: [Boatanchors] Viking II Modulation Problem
>>
>>If it was factory built it has a chance of being correct and unhacked. If 
>>it
>>was a kit than anything is posible.
>>
>>Carl
>>KM1H
>>
>>
>>----- Original Message ----- 
>>From: "Al Parker" <anchor at ec.rr.com>
>>To: "Richard W. Solomon" <w1ksz at earthlink.net>;
>><boatanchors at mailman.qth.net>
>>Sent: Saturday, October 10, 2009 10:28 AM
>>Subject: Re: [Boatanchors] Viking II Modulation Problem
>>
>>
>>> Seems like the screens oughta be bypassed originally.
>>> 73,
>>> Al, W8UT
>>> ----- Original Message ----- 
>>> From: "Richard W. Solomon" <w1ksz at earthlink.net>
>>>
>>>>I decided a scope would help in tracking down why I
>>>> have low modulation levels.
>>>> Surprise !! Looking at the Plate and Screen of the
>>>> second audio stage I get a high level of oscillation
>>>> as I crank the Gain Pot past about 4 on the dial.
>>>> I don't see any oscillation on the Grid ??
>>>>
>>>> This is the stock Viking II audio circuit, no mods
>>>> made except to replace the caps.
>>>>
>>>> Maybe I should bypass the screen of the second stage ??
>>>>
>>>> Any thoughts ??
>>>>
>>>> 73, Dick, W1KSZ
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>