Re: [amsat-bb] PCR-1000

["Edward R. Cole" <al7eb@xxxxxxxxxxxxx>]

I know nothing of the PCR-1000, but...

It really doesn't matter much what the IF receiver sensitivity is...within
reason.  The Drake LNB IF amplifier certainly will put out at least a 1 uv
signal, and more likely in the tens of uvolts!  

For example, I have a DEM 1420/144 MHz convertor for radio astronomy, which
I assume is similar to the 2.4G unit, and I get -80 dBm output [as measured
on an IFR service monitor]!  That will almost drive a xtal set ;-)

In fact it over-drives my FT-847 when the conv is preceded by a RAS LNA
[.30 dBNF].  The LNA combined with the DEM provide 67 dB gain...smokin man!
 I have a 30 dB attenuator after the DEM conv to tame things down a bit.
Of course I could remove the MAR-6 IF amp from the DEM unit, but I want the
gain to drive a wideband VHF detector I am making for radio astronomy [I
use either the FT-847 or FT-817 with the RAS/DEM convertor for SETI
narrow-band observations].  BTW my SETI receive sensitivity* at 1420 MHz is
-176 dBm and with the 2.5m dish it becomes -203 dBm!  [*threshold using
FFTDSP-42 with 2 Hz bins]

You should be able to observe at 122 if SSB is available on the PCR-1000 at
that freq.

Ed

>From: "Mark L. Hammond" <hammond@surrealnet.net>
>Yes, please let us know how it performs next pass.
>
>Has anyone seen the specs around 122 MHz?  They have a huge gap in the 
>quoted specs...although it seems to have coverage from about 0.5-1300 MHz 
>(minus cellular in the US...)
>
>It might be really slick to use with the stock crystal in the Drake 2800.
>
>73,
>
>Mark
>
>At 10:23 AM 2/18/2001, Robert Jewell wrote:
>>I have a PCR 1000, but I have not used it yet with my downconverter.  I had
>>the same idea, to not fry my downconverter.  It also has some buttons and
>>whistles to play with.
>>
>>The advertised specs on the various receivers (@ 144 mhz) are:
>>
>>PCR-1000 = 0.2uv
>>FT-847      = 0.125 uv
>>IC-821H    = 0.11 uv
>>R-7000      = 0.3uv
>>R-7100      = 0.2uv
>>R-8500      = 0.32uv
>>IC-910H    = 0.11uv
>>(less is better)
>>
>>It shows that the PCR-1000 is right in there with wideband receivers.
>>
>>I'll try it the next pass to see what it looks like.
>>
>>AC9R@amsat.org
>
>
>Mark L. Hammond  [N8MH]
>
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