[TenTec] Orion and RX-320 on DRM

[Mark Erbaugh]

Larry,

I couldn't read the capacitor value in the picture (I tried loading it into
Photoshop and zooming in).  Someone else pointed out the mod that had the
0.1 uF cap, had it in series (it also got the signal from a different point
on the PC board).  I think I'll try removing the cap and see what happens.
I have no cap in either the Pegasus or Orion and both work.

73,
Mark

----- Original Message ----- 
From: "W1GOR" <W1GOR at Maine.RR.Com>
To: <tentec at contesting.com>
Sent: Friday, October 01, 2004 10:24 AM
Subject: Re: [TenTec] Orion and RX-320 on DRM


> Mark,
>
> 0.1uF at 12kHz exhibits a capacitive reactance of approximately 132 ohms.
> Without knowing the output impedance of the IF minus the bypass cap, I
can't
> determine exactly what effect the insertion of the cap has on the IF
output
> of the receiver.   Can you try a lower value capacitor..?  Perhaps 0.01uF
or
> so...  This should reduce the loading of the 12kHz signal and still
provide
> bypassing for higher frequencies.
>
> Do you know the actual value of the cap in the RX-320D version of the
> radio..?   Is it possible to determine that value from the bottom side
> picture..?   Is a schematic of the RX-320 or RX-320D available on line..?
> I'd like to understand the details of DRM, but, without more information,
> I'm sort of shooting in the dark...
>
> 73, Larry - W1GOR
>
>
> ----- Original Message ----- 
> From: "Mark Erbaugh" <mark at microenh.com>
> To: <tentec at contesting.com>
> Sent: Friday, October 01, 2004 8:59 AM
> Subject: Re: [TenTec] Orion and RX-320 on DRM
>
>
> > > What is the IF of the RX-320..?   0.1uF sounds like a low Xc across
the
> IF
> > > output...  What was your reason for bypassing the IF output..?
> >
> > The IF is 12 kHz.  I added the capacitor because that's what one of the
> mods
> > I found on the internet did. Also, If you look at the bottom side
picture
> of
> > TenTec's RX-320D (on their website), you can see a capacitor across the
> > output.
> >
> > 73,
> > Mark
> >
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> > TenTec at contesting.com
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>
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