[Premium-Rx] Cubic 3030 info requested

[Hans.Hamradio]

Hi John.

Got the following reply by the owner on your info.

Regards

Hans/PT

----- Original Message ----- 
From: John 
To: Hans.Hamradio 
Cc: premium-rx at ml.skirrow.org 
Sent: Saturday, November 19, 2005 11:44 PM
Subject: Re: [Premium-Rx] Cubic 3030 info requested.
 ..


  You are probably right on the 1st IF filter being 20 KHz.  The 16KHz is typically a straight-through path on the 2nd IF Filter board.  That is, you get 5 filters, plus the 6th is actually the 1st IF bandwidth combined with tuned IF amps.

I've checked it, the roofing filter is 10 kHz.
So, how do they get 16 kHz BW on the 2nd IF?


  OK on the firmware--I'm not familiar with it, but that means nothing.  NOTE:  every time a customer changes the filter order, the firmware changes because the readout values are hard-coded into the firmware.

In that respect, some Racals are better. ;-)


  Keypad bounce is related to the panel interface--look for a big tantalum cap---if it is orange orange orange, it's a pre-fix module.  If you add about 4.7uf in parellel, you'll be much less bouncy.

Will check this out.

 ..


  I've been working on a series of modifications that make the receiver more pleasant to use and listen to.  I'm having good success thus far.  The mods solve bouncy keypads, noisy idling rx's, digital EMI radiated by rx, S meter alignment, etc.

Is it possible to get a description of these fixes? In particular, I would like to fix the SSB/CW AGC, which IMO is rather bad.

 ..

Thanks John, your comments are very much appreciated!

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