National RF makes a great portable unit that will work down to 1.8mhz
I have one of their units with the AA A B and C loops that cover 3.8-5mhz I see they now have a BB loop listed for 1.8-3.5mhz
Glad you brought this up I didn't know they had that new loop for 1.8-3.5mhz I'm will give them a call Monday morning.
HFDF active directional antenna system http://www.nationalrf.com/type_hfdf_vector.htm they also have a unit for the shack called HFDX Vector-Beam http://www.nationalrf.com/type_hfdx_vector-beam.htm usual disclaimer, just a satisfied customer. -- GB & 73 K5OAI Sam Morgan On 5/17/2014 6:47 PM, Jim Miller wrote:
I've pulled my P3 out of my setup to try and go searching for sources of 160/80m RFI. I did a whole house shutdown today and made sure that anything which had a battery was also shut down. That included the fire/burglar alarm system. For the purposes of these two bands my house is "clean." So now I need to do a walk around the area to see if I can locate the sources. I tried a little DC to daylight receiver with little success even with a 1ft diameter 2 turn loop for an antenna. The signals in question are too narrow band and the receiver is too insensitive so the signals are buried in noise. I'm now trying to use the P3 in hopes that its signal processing and averaging and ability to see a broader spectrum might be easier to use than listening to a single frequency. I tried the loop antenna directly into the P3 while powered on a battery and it seems like I could use a bit of gain to get over the input noise of the P3. Have others tried this and if so what sort of preamp, antenna or other setup was used? Right now focused on 160 and 80m. 73 jim ab3cv
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