Re: Topband: Waller Flag Question

And if you look at US Patent 2,247,743, it appears that Harold Beverage conceived of a horizontal Flag around 1941. best wishes, Nick At 21:52 06-09-15, you wrote: Bruce wrote on Sept 6. Snip < Check it out http://www.qsl.net/k4fk/presentations/WF-receiver-antennas-SFDXAs.pdf > Bruce, ref

Topband: [WARNING: A/V UNSCANNABLE]RE: Waller Flag Question

Tom -- You asked for the source of the statement about a Waller flag needing 40 dB of preamplification. See http://www.kkn.net/dayton2011/N4ISWallerFlag.pdf at pages 6 and 7. -- Art, KB3FJO _ Topband Reflector Archives -

Re: Topband: Waller Flag Question

I find them at hamfests, typically for a buck apiece. I've also seen suggestions that they can be found at thrift shops. 73, Jim K9YC On Mon,9/7/2015 5:08 AM, James Rodenkirch wrote: Any suggestions, Jim, on where to find small, inexpensive linear supplies to replace the wall warts?

Topband: Waller Flag Question

> "I've replaced all of the SMPS blocks that came in my door with vintage linear supplies (and some are vintage linear supplies float-charging sealed lead acid batteries. 73, Jim K9YC" Same here. For wall-mounted power supplies, Jameco has an excellent selection of regulated and

Re: Topband: [WARNING: A/V UNSCANNABLE]RE: Waller Flag Question

On Mon,9/7/2015 3:31 AM, Arthur Delibert wrote: You asked for the source of the statement about a Waller flag needing 40 dB of preamplification. See http://www.kkn.net/dayton2011/N4ISWallerFlag.pdf I saw that statement as well, which noted a gain of -53 dBi. My NEC model, using Carlos's

Re: Topband: Waller Flag Question

Art I don't know where this coming from ,but the gain you need for a VWF modest size is 20db for vertical polarization and for horizontal HWF you need 40db on 160m, on 80m divide this by 2, you need only 20 dB and on 40m 10 dB a NORTON preamp is enough. All situations you need a band pass

Re: Topband: Waller Flag Question

>> At -140 dBm and 250 Hz noise bandwidth, the system would require a 1 dB noise figure front end. That's about 35 deg K noise temperature. >>> Tom is as usual 100% right, the RX system gain should be near 1 dB, it means the preamp at 1.8 MHz should be .5 dB NF the input filter and the feed

Re: Topband: Waller Flag Question

Andrew Very interesting, that is my presentation, but my updated early terminated loop reference was from Harold H. Beverage patent applied 1938 and issue 1941 owned by RCA U.S. Patent 2,247,743 Jul 1, 1941 Broadband Uni-directional Shortwave Antenna

Re: Topband: Waller Flag Question

Thank you, JC: I don't know where this coming from ,but the gain you need for a VWF modest size is 20db for vertical polarization and for horizontal HWF you need 40db on 160m, on 80m divide this by 2, you need only 20 dB and on 40m 10 dB a NORTON preamp is enough. All situations you need a

Re: Topband: [WARNING: A/V UNSCANNABLE]RE: Waller Flag Question

Carlos, Note that I referred to "horizontally POLARIZED" and "vertically POLARIZED" antennas. My comments on, and analysis of, the Waller Flag were based on my model of a vertical Waller loop. A horizontal Waller Flag at a height great enough to have useful sensitivity is not even close to

Re: Topband: [WARNING: A/V UNSCANNABLE]RE: Waller Flag Question

Jim The concept of horizontal dipole is just a name for a wire parallel to the ground. If you change the description from TOTAL Field on EZENEC and use Horizontal and Vertical field your results won't be the same. On low bands Total Field is just one dimension. Horizontal and Vertical makes all

Re: Topband: [WARNING: A/V UNSCANNABLE]RE: Waller Flag Question

On Mon,9/7/2015 1:05 PM, K1FZ-Bruce wrote: Thanks Jim, There are new hams that do not know how horizontal antennas patterns change over ground. Right. In general, horizontally polarized antennas only care about height, while vertically polarized antennas care SOME about height, but mostly

Re: Topband: [WARNING: A/V UNSCANNABLE]RE: Waller Flag Question

Thanks Jim,  There are new hams that do not know how horizontal antennas patterns change over ground. On 160 meters, Usually, but nor always, higher is better up to 1/2 wavelength for low angle DX..   Lousy soil, like low conductivity sand, dry desert soil, can put the effective conducting

Re: Topband: Waller Flag Question

"" A similar observation was made 20 years ago by Brian Beezley, K6STI, in a QST article titled "A Receiving Antenna that Rejects Local Noise" (September, 1995, page 33): I've been looking around for something that might work better than my present antenna, and I see good reports about the

Re: Topband: Waller Flag Preamp

Guys, Gary, KD9SV, has developed a very good 40 db preamp just for the Waller Flag that covers both 160 and 80M bands. 73, Dennis W0JX --- On Sat, 9/5/15, kd9sv wrote: > From: kd9sv > Subject: RE: Topband: Waller Flag > To: "'Dennis W0JX'"