[amsat-bb] Attaching the coax to antenna boom

[EC4TR Luis]

Hi all
I´m in the same situation, this summer I´ll mont my pair of M2 with
separate feedlines for V and U, I´m going to use a good 7mm coax cable
routing across de boom, because routing to the back itcomplicates my
assembly a lot and adds extra weight to the back.
I hope it does not distort my radiation pattern too much
73 Luis
EC4TR

El lun., 18 mar. 2019 a las 6:27, Frank Karnauskas (<n1uw at gokarns.com>)
escribió:

> This is quite curious.
>
> Page 1 of the WA5VJB paper says, "Run the coax back down the antenna
> and along the boom keeping the radius small..."  His hand-drawn
> illustration shows the feedline going down the boom then making a hard
> turn at the boom-to-cross arm plate.
>
> The M2 instruction sheets for the 2MCP8A and 436CP16 antennas both
> state (in bold type), "Do not route feedline to boom to mast plate  as
> exiting antenna here will adversely affect circular field."
>
> Mr. Britain's paper is obviously focused on mounting the cross bar
> somewhere along the boom of a somewhat long antenna.  The M2
> instructions are for mounting short antennas from the back of the boom
> to the cross bar. Not the same situation.  But, for a newbie like me,
> the definitive conclusion to this discussion is...I am still confused.
>
> I was hoping to hang my M2 LEO antennas Monday morning but now not
> until after I call the M2 support line for their read on this.
>
> 73,
> Frank
>
> FRANK W. KARNAUSKAS, N1UW
> ARRL MINNESOTA AFFILIATED CLUB COORDINATOR
> AMSAT NEWS SERVICE ROTATING EDITOR
> 1402 SUMMIT SHORES DR.
> BURNSVILLE, MN 55306
> N1UW at GOKARNS.com
> 612-644-9174
>
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Gary
> Sent: Sunday, March 17, 2019 2:29 PM
> To: radiomb; amsat-bb at amsat.org
> Subject: Re: [amsat-bb] Attaching the coax to antenna boom
>
> Yes, you can, just pay attention to how far your coax turn is from
> your driven element. There are a couple spots to avoid.
>
> It is pretty well explained in Kent Britain's (wa5vjb) paper here:
> http://www.kk0sd.net/metalboom/metalboom.htm
>
> 73,
> Gary kk0sd
>
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of radiomb
> Sent: Sunday, March 17, 2019 4:04 PM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Attaching the coax to antenna boom
>
>    Building my new ground station and another question. I have always
> only elevated my antenna 90 degrees. I loose about 20 25 seconds while
> the azimuth rotator turns 180 degrees to track the rest of the pass. I
> have just let the coax hang off the back of the antennas in a big
> loop. I am afraid it will get hung up going 180 degrees. Question, Can
> I attach the coax to the antenna boom and run it back until it gets to
> the cross boom or will that throw off the radiation pattern?
> Thanks 73
>   Mike K4MIA
>
>
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> _______________________________________________
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> to all interested persons worldwide without requiring membership. Opinions
> expressed
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