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Re: [Discuss-gnuradio] AOR 5000 as front end to USRP
From: |
Eric A. Cottrell |
Subject: |
Re: [Discuss-gnuradio] AOR 5000 as front end to USRP |
Date: |
Sun, 31 Dec 2006 16:51:11 -0500 |
User-agent: |
Thunderbird 1.5.0.8 (X11/20060911) |
Eric Blossom wrote:
> On Sun, Dec 31, 2006 at 01:42:31PM -0500, Eric A. Cottrell wrote:
>> Hello,
>>
>> Thanks to both of you for the information. I got the RX PGA gain up all
>> the way. I rewound the isolation transformer to be 1:1 with 14 turns.
>> I still have to turn off AGC for good signal levels but I got 20 to 30
>> dB SNR on RCI at noon today.
>>
>> Doing some simple tests with the PSD display in DReam I can not see the
>> noise floor increase when the receiver connected. The FFT from the
>> USRP data also shows no increase so an amplifier is needed. What
>> amplifier do you use on the AR8600?
>
> I used a Ramsey PR2 broadband preamp (it's probably overkill, but it's
> what I had on hand)
> http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=PR2
>
> Eric
>
Hello,
Yeah, it looks like exactly what I need. Maybe I will also try hooking
an antenna up to it and fry my LFRX board from the local AM radio
station down the street. :) There is a local store that sells Ramsey
Kits so I may look there Tuesday night.
I seem to remember AMSAT-NA was giving out MMICs one year at the
symposium. I should see if I have any. The problem is finding them as
my "for a rainy day" cache is huge.
Is the PR2 battery powered or does it have a DC In? I hope it is 12 volts.
73 Eric