[TowerTalk] [BULK] - Re: Coax

[Steve Katz]

The 2m run is a problem.  LMR600 isn't flexible enough to go up and down
with the tower, or around the rotor.  LMR400 flex should be just fine for HF
but at 2m will have 3-1/2 dB loss, which is kind of a lot.  Might consider
LMR400 flex for base of tower to beam feedpoint and LMR600 or hardline from
base of tower to station, so one "splice" would be required.  This can
reduce loss from ~3.5 to ~2.5 dB.  For serious weak-signal work on 2m,
that's a reasonable savings vs. investment; for local ragchewing or FM work,
I wouldn't bother with it.-WB2WIK/6

-----Original Message-----
From: K8RI on Tower talk [mailto:k8ri-tower at charter.net]
Sent: Tuesday, September 13, 2005 3:21 PM
To: Craig Thompson; TOWERTALK at contesting.com
Subject: [BULK] - Re: [TowerTalk] Coax


It's 228 feet from the station to the antennas here.  I use LMR 400, but 
plan on going to LMR600 or 900 for the UHF and VHF.  If you do the 
calculations for HF I think you will find the loss in LMR 400 is 
insignificant.  I use flexible version of LMR 400 for the rotator loops.

I have used N connectors in the past but I'm switching to UHF because they 
are more robust and can stand higher voltages.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com


>I am putting up a HDX589MDPL US Tower. I want to keep losses low but need 
>to use something flexible for tower operation. The distance from antenna to

>station is 225 feet. I will use N connectors. The antennas are a MonstIR 
>and a M2 15 el 2m yagi. What are your recommendations?
>
> Thanks, Craig
> K9CT
>
> Craig A. Thompson, President
> Thompson Electronics Company
> 905 S. Bosch Road
> Peoria, IL 61607-1199
>
> 309-697-2277 X225
> 309-697-3337 FAX
> http://www.thompsonet.com
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with 
> any questions and ask for Sherman, W2FLA.
>
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> 
_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.

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