From: "VE3AX" 
Subject: Re: [drakelist] TR7 drift


"VE3AX"  made an utterence to the drakelist gang
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For those interested in learning about frequency stabilization for L/C
VFO's, here's an interesting link I found.  I wasn't aware this is 15-20
year old technology.  I suspect Conny DL1SDQ's DAFC for the TR7 works along
one of these ideas.

http://www.hanssummers.com/radio/huffpuff/contents.htm

What I like about this is the ability to avoid the external digital VFO idea
like the DDS-2A for the S-line or the new Italian-made  DDS-4 for the Drake
4-line.  While impressive pieces indeed, I prefer to use the stock internal
VFO's in these rigs.  I acknowledge that those seeking computer control of
their Drakes should love the Woodbox Radio DDS-4.

http://www.cqdx.it/woodbox/DDS4.html

73

Peter
VE3AX

----- Original Message -----
From: "doc" 
To: 
Sent: Friday, July 02, 2004 10:12 AM
Subject: Re: [drakelist] TR7 drift


>
> doc  made an utterence to the drakelist gang
> ----------------------------------------------------------------------
> If the $20. TCXO I mentioned would work, and I correctly understand
> $C 150 to be close to $150. in USD what is the advantage of the
> more costly alternative, please?
>
> I was unable to figure out the German site as easily as you!  ;-)
>
> 73, doc kd4e
>
> VE3AX wrote:
> > "VE3AX"  made an utterence to
the drakelist gang
> > ----------------------------------------------------------------------
> > Hi all:
> >
> > While we're on the subject of TR7 VFO drift, has anyone tried out Conny,
> > DL1SDQ,s, PLL board for the TR7?  He put one on the Bay a while back but
> > sells directly as well.  I exchanged e-mails with him and have checked
out
> > his web site, but before shelling out $C 150 for each board (incl.
shipping)
> > , I'd love to talk to someone who has installed one first.  It appears
to
> > tune in (at installation) selectable 2, 4 or 8 hz steps, and is tuned by
the
> > existing PTO (???).  Takes 5 wires to install and mounts underneath the
> > motherboard.
> >
> > I don't find the drift objectionable after the radio has been on for a
while
> > and I have left the PTO dial lights in place. They just look too good
with
> > the new blue filters!  I have found that by using the external RV-7 as
the
> > main tuning control, drift is significantly less a problem.  Or you can
use
> > the RV-75 if you are lucky enough to have one.  Incidentally, Conny
tells me
> > that you can also install one of his boards in the RV-7.
> >
> > Conny's web site is at http://www.conny-dl1sdq.de/1312.html
> >
> > It is in German but you can figure out just about everything you need to
> > know without knowing the language.  The pictures tell a lot.  He has
some
> > other neat ideas for the TR7 as well. I particularly like the 10 turn
pots
> > for replacing the frequency control/voltage control pots on the power
supply
> > board.  Far less likely to get "bumped" and easier to
put right on
> > frequency/voltage.
> >
> > 73
> >
> > Peter
> > VE3AX
>
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