[amsat-bb] Arrow modification

[k6vug at sbcglobal.net]

 Thanks for sharing Rick, it helps to compare notes.  I have experienced the problem with a single coax feeding a full duplex Icom W32A HT as well as two separate coaxes feeding two radios.  The front-end gets severely de-sensed esp when the V/U frequencies get close to harmonic relationship.  I guess I need to investigate further.  

73!Umesh, k6vug 



    On Wednesday, January 2, 2019, 5:00:36 PM PST, saguaroastro <saguaroastro at cox.net> wrote:  
 
 Umesh, I have not experienced any of that in either mode. In fact most of my contact with it were V/u. This is using a KW D7A or D72a
73Rick Tejera (K7TEJ)Saguaro Astronomy ClubWww.saguaroastro.orgThunderbird Astronomy ClubWww.w7tbc.org

-------- Original message --------From: k6vug at sbcglobal.net Date: 1/2/19 17:09 (GMT-07:00) To: Kenneth P Alexander <ve3hls at gmail.com> Cc: AMSAT -BB <AMSAT-BB at amsat.org> Subject: Re: [amsat-bb] Arrow modification 
 The WA5VJB models are great for UHF up and VHF down (assuming duplex ops), but get severe RX overload for VHF up and UHF down. 

73!
Umesh, k6vug




    On Tuesday, January 1, 2019, 5:53:01 PM PST, Douglas Quagliana <dquagliana at gmail.com> wrote:  
 
 I'm not sure if anyone has modified an Arrow to put the elements in the same plane. 

However, Kent's "cheap LEO" yagi puts the 2m and 70cm elements all in the same plane, so it can be done (if you know what you are doing.) See

http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf

73,
Douglas KA2UPW/5

> On Dec 31, 2018, at 9:37 PM, Kenneth P Alexander <ve3hls at gmail.com> wrote:
> 
> Hi Doug,
> 
> Simply moving them into the same plane will likely cause problems because
> the bands are harmonically related.  The 2m elements will make a mess of
> the 70cm radiation pattern if they're in the same plane.  That said, I did
> just stumble across a satellite yagi design where the elements were
> intentionally in the same plane.  Only the 2m yagi is fed and a passive 70
> cm driven element is placed close to the 2m driven element so the 2m
> element excites the 70 cm passive element, causing it to radiate on 70 cm.
> I believe it's called an open sleeve design.  I think it was 3 elements on
> 2m and 3 or 4 elements on 70 cm.  Sorry I didn't bookmark the page.  I
> don't remember where I saw it.  Hopefully someone else saw it and remembers.
> 
> Happy New Year,
> 
> Ken
> bueng-ken.com
> 
> 
> On Tue, Jan 1, 2019 at 10:20 AM Douglas B Tabor via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
> 
>> I’ve been using my well faded Arrow for 4 years. The boom is a much
>> appreciated LIDstick so the old man can swing it as well as a 3 year old.
>> 
>> Has anyone modified the Arrow to have 2m and 70cm elements in the same
>> plane (instead of stock 90 degrees)? I’m just curious what the performance
>> result might be - I know it would be easier to get in and out of the
>> RoverMobile instead of doing the twist-and-angle it out.
>> 
>> HNY and 73,
>> 
>> Doug, N6UA
>> 
>> Douglas Tabor
>> dtabor52 at icloud.com
>> 
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_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
  
_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb