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Re: [Discuss-gnuradio] USRP HF setup

From: Davek
Subject: Re: [Discuss-gnuradio] USRP HF setup
Date: Sat, 25 Sep 2010 06:37:08 -0400

Alex, thanks for the reply. I have seen most of your vids, they are excellent.  
Your site is full of great information. If i didnt get any replies, i was 
actually gonna mail u off list ... Anyway, i will consider this antenna, it 
looks to be relatively simple, which i like :) 

Sent from my iPad

On Sep 25, 2010, at 6:14 AM, Alexandru Csete <address@hidden> wrote:

> On Sat, Sep 25, 2010 at 8:38 AM, Davek <address@hidden> wrote:
>> Has anyone had Any success with amateur HF with the usrp? I would like to 
>> purchase a basic rx and maybe a basic tx for monitoring the hf amateur 
>> bands. I know i need lownoise amplifaction and filtering but not sure what 
>> to get. I know i could just use the IF output of transciever, but im not 
>> sure if thats what i wanna do. if anyone has setup something i would be 
>> curious to hear about it thanks,
>>  Dave
> Hi Dave,
> I have had the USRP1 and LFRX connected to a Butternut HF2V antenna
> with 30m and 160m extensions using ~30 meters of RG213 coax. No preamp
> or filter or anything else, and I could hear lots of SSB/CW traffic
> (even DX) and AM broadcast. I have two video recordings:
> AM on medium waves: http://www.youtube.com/watch?v=317Iu6HRA0w
> Hamradio SSB/CW on 7MHz: http://www.youtube.com/watch?v=t1FEq6h7Z1c
> I have measured the sensitivity in CW to 3-4 microvolts so yeah, a
> preamp would be useful above 10 MHz. I think one can get these
> "acrtive whip antennas" for shortwaves, I guess the filter and preamp
> could be used with a real antenna.
> I have not tried the transmitter on the air. For sure that will need
> power amplifier and low pass filters!
> Alex
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