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@microenh.com>
To: <tentec@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@contesting.com
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