Further update:
Thanks to suggestions from this list, I re-examined the picture of the
RX320D from the TT website and the cap (I can't read the value) is in
series. I reworked my mod so the cap was in series.
I still had about 10 dB lower S/N ratio reported by the Dream software with
the RX320 versus the Orion. Just for comparison, I hooked up the Pegasus and
saw S/N numbers similar to the RX320. However, when I engaged the RF
Attenuator on the Pegasus, the S/N radio came up to almost the same level as
the Orion.
Since the RX320 doesn't have any attenuation, I switched to a poorer
anntenna and the S/N ratio came up on the RX320. It looks like something is
overloading.
73,
Mark
----- Original Message -----
From: "Mark Erbaugh" <mark@microenh.com>
To: <tentec@contesting.com>
Sent: Thursday, September 30, 2004 11:53 PM
Subject: [TenTec] Orion and RX-320 on DRM
> I have modified my Orion and my RX-320 to make the IFs available to use
with
> the Dream DRM decoding software.
>
> Listening to the RCI (Canada) DRM broadcast directed to NE USA this
evening
> and using the same anteana. The Dream software reports a signal to noise
> ratio. The best I could get with the RX-320 was about 16 dB S/N which
> resulted in marginal DRM reception. The Orion was 24 dB which was almost
> perfect reception.
>
> I know the Orion is a better receiver, but is this difference to be
> expected? I am taking the IF's directly from the receiver insidee the
> respective radios. The only difference is that I put a 0.1 uF cap across
the
> output of the RX-320, I didn't do that with the Orion. Do you think
> removing the cap would help?
>
> 73,
> Mark
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|