One of my RA1792s has 5.7kHz LSB/USB filters. What would this bandwidth be for?
Rob
----- Forwarded by Rob J Davies/RED/RESEARCH/PHILIPS on 21/02/03 07:39 -----
To: 'Keith Grünberger' <k.gruenberger at aon.at>
premium-rx at ml.skirrow.org
cc: (bcc: Rob J Davies/RED/RESEARCH/PHILIPS)
Subject: RE: [Premium-Rx] Ra6790/GM!
"Carcia, Frank A.
HS" Classification:
<francis.carcia at hs.utc.com>
Sent by:
premium-rx-bounces at ml.skirrow
.org
17/02/03 13:19
The 3.0 and 1.2 KHz filters will help. Gary Wingerd may still have some
Mechanical filters that work well. You will have to buy two LSB and USB.
Check Rockwell Collins Site for new parts. Crystal filters are rare as hen's teeth.
The mechanical have a little less loss but 2 dB pass band ripple by spec
Crystal filters are 1 dB by spec. I found mechanical filters measure about
1 dB. fc
-----Original Message-----
From: Keith Grünberger [mailto:k.gruenberger at aon.at]
Sent: Sunday, February 16, 2003 3:57 PM
To: premium-rx at ml.skirrow.org
Subject: [Premium-Rx] Ra6790/GM!
Hi @ all!
Finally got my RA6790/GM and its undergoing an intensive testrun at the moment. ;)
What I am looking for are some 2,7kHz Filter for SSB, mine has 3.24kHz which is a bit too wide for me!
Has anyone got some left over? Or wants to swap against an 16kHz one?
Or does anyone know where I could get some?
Thanks to all!
CU
Keith @ OE
_______________________________________________
Premium-Rx Mailing List
To Post: premium-rx at ml.skirrow.org
For Info: http://ml.islandnet.com/mailman/listinfo/premium-rx
----- Forwarded by Rob J Davies/RED/RESEARCH/PHILIPS on 21/02/03 07:39 -----
To: "'GandalfG8 at aol.com'" <GandalfG8 at aol.com>
103360.2133 at compuserve.com
cc: premium-rx at ml.skirrow.org
(bcc: Rob J Davies/RED/RESEARCH/PHILIPS)
"Carcia, Frank A. Subject: RE: [Premium-Rx] Racal RF preamp
HS"
<francis.carcia at hs.utc.com> Classification:
Sent by:
premium-rx-bounces at ml.skirrow
.org
17/02/03 13:23
I would think adding an amplifier will cause the second mixer to overload
at a lower level. I found the Racal first mixer is good up to minus 30 dBM
before third order spurs come out of the noise floor. fc
-----Original Message-----
From: GandalfG8 at aol.com [mailto:GandalfG8 at aol.com]
Sent: Sunday, February 16, 2003 3:57 PM
To: 103360.2133 at compuserve.com
Cc: premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] Racal RF preamp
Hi Tom
You raise some interesting issues on this one.
I found an online reference a while ago to the "rare" 6790 RF amp.
The external and internal photos, and schematic, looked to be identical to the amp fitted to the 1792.
I have a spare amp and was planning to fit that to my 6790/GM but was advised that the 6790 overloads with the amp fitted so I left well alone.
Although fitted as standard to the 1792 there are internal links which will bypass the amp but I've not heard of anyone doing that.
Certainly my 6790 seems just as sensitive without the amp as the 1792 does with it but I must admit that I haven't done any measurements to confirm that.
I don't know that the 1792 front end was dodgy but do wonder, despite other similarities, if the gain distribution in these two receivers is different.
regards
Nigel Clarke
G8PZR
_______________________________________________
Premium-Rx Mailing List
To Post: premium-rx at ml.skirrow.org
For Info: http://ml.islandnet.com/mailman/listinfo/premium-rx