[Premium-Rx] Comparing Premium RXs to Amateur Transceivers

[Carcia, Francis A HS]

Brian,
Check the gain setting on your first IF. This will effect the dynamic range
of the radio.
The weak link is the second mixer. Also the bandwidth of the filters in the
first IF 
will have a big effect on performance. gee I've never observed the these
problems in
any of my 6830s. It would be interesting to see your numbers. I would also
like to see what you measure for phase noise. I think the RA6830 is cleaner
than the cubic 3030 and the 2050.
The Orion is quite a machine though. I have a 6830 synthesizer module that
came out of the lab that is my cleanest.   fc  

-----Original Message-----
From: Brian D. Comer [mailto:bcomer at cox.net]
Sent: Thursday, October 21, 2004 5:33 PM
To: premium-rx at ml.skirrow.org
Subject: RE: [Premium-Rx] Comparing Premium RXs to Amateur Transceivers





I have not had time to do a full performance comparison but here are
some points I can give. For the Ten-Tec Orion verses the Racal 6830.

The Racal has a higher third order IP for tone spacings in excess of 20
KHz 30dBm compared to 25 dBm. For close in spacings the Orion is much
better by as much as 40 dB. 

The Phase noise of the Racal is appalling compared to the Orion.

>From an operational point of view the 6830 overloads due to close in
signals so much that it is unusable in contests from this location. 
The Orion has shown no problems with its dynamic range here or when used
in field day operations.
I still find the tuning on the older analog radios better than the
modern shaft encoded units (due to the shaft encoder resolution). For
performance the Orion is the best radio I have, but at this time the RA
117 is the most satisfying to tune around the bands. At this location
there are no signals that show any differences between radios with IMD's
above +20 dBm and much lower on radios with good pre-selectors. 

I would like to give a much better answer to this and I am hoping to
document my tests on both the RA 6830 and some of the older vacuum tube
ham radio / wwii receivers I have but time is a problem at the moment.

73 Brian KF6C G3ZVC

  
-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Ahmet Gundes
Sent: Thursday, October 21, 2004 12:57 PM
To: Premium-RX
Subject: [Premium-Rx] Comparing Premium RXs to Amateur Transceivers


Hello everybody,

I am wondering if anyone ever had a chance to compare the Premium
RX standalone receivers with the Receivers of modern Amateur 
Transceivers such as Icom IC756PROII, IC756PROIII, IC-7800, Yaesu
FT-1000MP-V, FT-847, Kenwood TS-870S, Ten-Tec Orion,.... etc.
  
Amateur TX receivers seem to be packed with high performance and
cleverly designed RF Front Ends coupled with the power of 32bit 
DSPs ( in some multiple DSP s ! ) and even dual independent receivers
having +40dBm IP3 performance !...

And how about the performance of Wide Band receivers such as 
AOR AR5000A+3, and ICOM R8500 in HF bands.  

It would be great to know if anyone ever did some performance
comparisons.

73...
Ahmet

-- 
___________________________________________________________
Sign-up for Ads Free at Mail.com
http://promo.mail.com/adsfreejump.htm


_______________________________________________

Premium-Rx Mailing List
To Post: premium-rx at ml.skirrow.org
For Info: http://ml.islandnet.com/mailman/listinfo/premium-rx
Visit the Website: http://kahuna.sdsu.edu/~mechtron/PremRxPage/



_______________________________________________

Premium-Rx Mailing List
To Post: premium-rx at ml.skirrow.org
For Info: http://ml.islandnet.com/mailman/listinfo/premium-rx
Visit the Website: http://kahuna.sdsu.edu/~mechtron/PremRxPage/