[TenTec] External DSP with Pegasus

[jerome schatten]

I had the same setup with my Jupiter and it was an excellent addition
even with the jupe's 150 hz filter. The skirts on the 784 are far
sharper than the jupe's filters. If you really want to get rid of the
noise, try turning down the RF gain and turning up the audio (try
turning off the AGC as well). If you're operating the 784 with it's
audio AGC turned on, try turning it off and readjusting the RF and Audio
gain on the Peg.
HTH,
jerome - va7vv

On Wed, 2007-03-28 at 13:45 -0400, Mark Erbaugh wrote:
> Recently I hooked up an old MFJ-784B DSP box to my Pegasus.  While the
> 784B is still in the MFJ catalog, the EPROM copyright sticker says 1996.
> One of the things I don't like about the Pegasus is the lack of any
> really narrow filters. I have enough problems copying just one CW signal
> (I'm doing this the old-fashioned way, by ear), and there are times,
> when the 300 Hz filter on the Pegasus just won't cut out a nearby
> signal, which really distracts me.
> 
> The 784B allows me to really narrow in on one signal. In addition, the
> 784B accepts a line level input and has an audio amp for a speaker
> output so I can use an external speaker (and not worry about not
> grounding the speaker). Another nice thing about the 784B was that it's
> 5-pin DIN is an exact match for the Pegasus accessory output, except pin
> 5, which can be ignored if you like to send and receive CW at the same
> audio frequency (on the 784B, pin 5 is an input that bypasses the DSP
> when in Tx, so you could hear a sidetone that's not in the bandpass of
> your Rx filter - on the Pegasus, pin 5 is unused).
> 
> The only downside is that the unit seems to increase the background
> noise a little and I haven't been able to cut that with the 784B's noise
> reduction. I find that under noisy (QRN) conditions, I can hear better
> without the 784B.
> 
> Has anyone tried any of the other DSP boxes with a Pegasus?
> 
> 73,
> Mark
> 
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