Rick, You'll be very pleased with the performance of the WB8DSB RFI hunting flag antenna.
Don't forget to need lots of preamp gain. The WB8DSB flag is about 60 dB down from a dipole on 160 meters. 40 dB of preamp gain is needed until you're very close to the RFI source. 73 Frank W3LPL ----- Original Message ----- From: "Richard" <rich...@karlquist.com> To: "Frank W3LPL" <donov...@starpower.net>, "rfi" <r...@contesting.com>, "PVRC" <p...@mailman.qth.net>, "topband" <topband@contesting.com> Sent: Friday, December 30, 2022 8:25:47 PM Subject: Re: [RFI] Powerline noise question Thanks Frank. You got me unstuck. I have ordered the DX Engineering Kits and the PL330 receiver. 73 Rick N6RK On 12/29/2022 7:53 PM, Frank W3LPL wrote: > Hi Rick, > > I recently built a WB8DSB man portable flag antenna (March 2021 QST) > for RFI geolocation, its performance far exceeds my expectations. > Its narrow deep null quickly, easily and definitively located the > source of very troublesome 160 meter RFI to a single power pole > more than three miles from my QTH. Prior to constructing the > flag antenna I could locate the RFI to only within a few hundred > yards of the RFI source. > > I built my flag antenna entirely out of materials I had on hand > from previous projects including 3/8 inch diameter fiberglass rods, > a pair of Advanced Receiver Research P1-30/20VD 20 dB HF preamps, > a case of eight AA batteries to provide power to the preamps, > a switchable attenuator and a Tecsun PL330 portable HF receiver. > > I highly recommend this easily constructed RFI geolocation antenna > for the toolkit of any serious HF operator. > > 73 > Frank > W3LPL > > > > > > ----- Original Message ----- > From: "Richard" <rich...@karlquist.com> > To: "rfi" <r...@contesting.com> > Sent: Friday, December 30, 2022 3:15:32 AM > Subject: [RFI] Powerline noise question > > I have a powerline noise coming from about 2 miles away, which is > nevertheless quite strong at my QTH. > > Here are the symptoms: > > 1. A 120 Hz noise burst at regular intervals, about 0.9 seconds apart. > > 2. The noise goes away after a rain; then comes back after things dry > out. > > 3. Can be heard from 500 kHz up to a few MHz. > > 4. The noise is very strong along a road for a few miles. There is a > > power line that follows the road. I haven't been able to localize it > better than > > that so far. From my QTH, though, it is definitely coming in at a > specific azimuth > > which is consistent with the noisy road a few miles away. (Using a loop > antenna > > for DF'ing). > > Any help appreciated. > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector