15 meters high vco voltage

[Roland Whitsitt]

I was doing the VCO voltage readings.  I got one voltage out of range and it won't tune down with L30.  On 15 meters it reads 8.49 at 25000.  It goes out of range at 22.159.
I checked C71-C74 and D21-D26.  Manual said  to also check C70 through C74.
Is there a C70?  Thanks.
Roland in Stockton
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[Don Wilhelm-3]

Roland,

Bands from 14 mHz and up typically have plenty of excess range - you
certainly have something wrong.

If things seem to change on you, you can be certain you have a bad solder
connection somewhare in the VCO area.

Concentrate on C73 - that is the only capacitor added for 15 meters, and
relay K13 which controls whether it is in or out of the circuit.

While you are checking things, take a look at D23 through D26 - they should
be MV209 type - that is the larger of the 2 varactor types and if you look
down on the top of them they will look like a full semicircle - the 1SV149
type is the smaller body and looks like a flattened semicircle when viewed
from the top.  If the varactors are not correct, the fixed capacitors will
not provide the proper tuning range.

73,
Don W3FPR

> -----Original Message-----
>
> I was doing the VCO voltage readings.  I got one voltage out of
> range and it won't tune down with L30.  On 15 meters it reads
> 8.49 at 25000.  It goes out of range at 22.159.
> I checked C71-C74 and D21-D26.  Manual said  to also check C70
> through C74.
> Is there a C70?  Thanks.
> Roland in Stockton
>

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[Roland Whitsitt]

Hey Don and the group,
  My flutter problem is gone now.  It was that subminiture choke.  It was
just bad. I shorted it out for now with another on the way.  Flutter is
gone.
The voltage problem on the upper 15 meters was my mistake.  I got a high
voltage because I was at 22150. Duh, where did I get that?  It was 21450,
and I'm fine there! hi hi
So this is what happens when you pull all nighters and rush things. But it's
the way I like to do it.
Anyways, the k2 is working fine and I already had a qso.  Now I can start on
all those option kits.  Maybe I'll slow down a little.
Thanks to all of you who offered to help in person and who help with advice
online.  This is just great.  Now, time to play!
73's Roland in Stockton
----- Original Message -----
From: "W3FPR - Don Wilhelm" <[hidden email]>
To: "Roland" <[hidden email]>; "elecraft" <[hidden email]>
Sent: Tuesday, July 26, 2005 12:46 PM
Subject: RE: [Elecraft] 15 meters high vco voltage

> Roland,
>
> Bands from 14 mHz and up typically have plenty of excess range - you
> certainly have something wrong.
>
> If things seem to change on you, you can be certain you have a bad solder
> connection somewhare in the VCO area.
>
> Concentrate on C73 - that is the only capacitor added for 15 meters, and
> relay K13 which controls whether it is in or out of the circuit.
>
> While you are checking things, take a look at D23 through D26 - they

should

> be MV209 type - that is the larger of the 2 varactor types and if you look
> down on the top of them they will look like a full semicircle - the 1SV149
> type is the smaller body and looks like a flattened semicircle when viewed
> from the top.  If the varactors are not correct, the fixed capacitors will
> not provide the proper tuning range.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----

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