Topband: Flag/Pennant Question

[W2PM]

If you want that you can look at the Waller versions which stack two antennas.  N4IS is the guru.  

But everyone is describing a very small version of the terminated loops here.  2 by 2 meters is crazy small.  I have experimented a great deal with these small loops when  K6SE came up with the concept.  They have perfect cardiod patterns just like the full sized models BUT negative 45 db "gain" is fairly useless for DX.  It's fine for BCB or more local work but the bare minimum for any DX performance would be a half sized pennant.  That's 15 ft by 7.  I'd only use that if you are in a very quiet area too as the output is quite low and a preamp would pull in too much local noise if you have it.  A tiny loop like the 2 meter squAre is better than a magnetic loop of the same size though. Unless you have a strong point source of noise you need to null which is where the mag loop would work out. 

There is no sense at all in trying to deepen the rear null.  35db null depth plus is pretty significant in any size.  

Im starting to compare a half size pennant now pointing to VK from here with a Short bog.  Something  less than 150 ft.  long.  So far casual observations are showing significantly greater output from the bog but I need to do more careful and controlled observations.  The half pennant is too low in output for the very weak signals I am experiencing here.  I've used the half quite well to Europe for 160 however. 


Sent from my iPad

On Nov 29, 2011, at 21:25, Arthur Delibert <radio75a3 at msn.com> wrote:

> 
> I was wondering whether it might produce a narrower pattern in the front, or a deeper null off the back, or maybe even both.  But indications from two people who have either modeled it or built it are that it requires 3 load resistors, one in each leg, and produces a highly reactive antenna with only a slight increase in gain.
> 
> Clearly better and simpler to add a second antenna and connect them through a phasing device to null the unwanted stations, as described by Mark Connelly, WA1ION.
> 
> ----------------------------------------
>> From: w2pm at aol.com
>> Date: Mon, 28 Nov 2011 21:49:40 -0500
>> To: radio75a3 at msn.com
>> CC: topband at contesting.com
>> Subject: Re: Topband: Flag/Pennant Question
>> 
>> Why would you do that?
>> 
>> Sent from my iPhone
>> 
>> On Nov 27, 2011, at 8:59 PM, Arthur Delibert <radio75a3 at msn.com> wrote:
>> 
>>> 
>>> I'm wondering if anyone has ever built or modeled a multi-turn flag or pennant antenna. I'm thinking maybe an odd number of turns with the resistor in the middle of the middle turn.
>>> 
>>> Thanks.
>>> 
>>> --Art Delibert, KB3FJO
>>> _______________________________________________
>>> UR RST IS ... ... ..9 QSB QSB - hw? BK
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK