[TenTec] Argo, Jupiter, Pegasus, RX320 overload

[George, W5YR]

A resistive attenuator in the antenna input will do about the same. Anything
that lowers the front end gain or input signal level will boost the IMDDR3
by the same amount.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:w5yr at att.net>





----- Original Message -----
From: "Jack Bryant" <ke4id at bellsouth.net>
To: <tentec at contesting.com>
Sent: Monday, July 21, 2003 8:03 PM
Subject: [TenTec] Argo, Jupiter, Pegasus, RX320 overload


> Hi, Gang,
> I suspect that the reason that some are not bothered by strong signals
inside the roofing filter is that the AGC kicks in and knocks the signals
down enough so that the interfering signal does not seem to be a problem.
With weak signal work this could be devastating, but may work fine for
> everyday applications.
>
> There is another way.  I removed the source bypass resistor from the 1st
IF JFET amp in my RX-320 to cut down the front end gain, and have been
pleased with that approach, i.e., reducing the gain before the DSP filters
are applied.
>
> On the RX-320 I made a modification to allow a 6 kHz wide filter to be
switched in at 455 KHz for SSB and CW use.  If you try a filter much
narrower than that, then some of the signal is lost due to the split tuning
duties between the VCO and DSP.  Since my 6 kHz filter was not
> particularly sharp, the difference between the standard filter and the
narrower filter was not that great.
>
> Regards,
> Jack, KE4ID
> Electrical Engineer, but mostly an all round tinkerer.
>
>
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