John,
Point well taken and I appreciate your input. This is uncharted waters
for me
going beyond RG8 and PL-259's, hihi.
I did what probably most of you have done and made an excel spreadsheet
showing all the feedlines, RG, LMR, Heliax, Cellflex, etc. in different
sizes
and the loss for 100 ft for all the bands from 80 to 10 meters.
I also added a cost column, which is very illuminating hihi.
As far as connectors go I have decided to go with DIN connectors.
So now to decide on the feedline. Cost wise the 7/8" Cellflex looks
very good
and has just about the same loss as LDF5-50, at about half the price.
Bob
K6UJ
On 9/6/16 5:00 AM, john@kk9a.com wrote:
According to the timesmicrowave and commscope websites at 30MHz LMR600 has
0.4dB/100ft loss and LDF4 has 0.357/100ft. They are very close in specs
and price so of the two I would pick the most durable. The real point of
my post was that K6UJ seemed more concerned about the connector than the
coax that is was attached to. Personally I would rather have 300ft of LDF7
with and N connector than 300ft of LMR600 with a commercial quality DIN.
John KK9A
To: <towertalk@contesting.com>
Subject: [TowerTalk] LMR600 male DIN
From: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 5 Sep 2016 01:49:44 -0700
Date: Sat, 3 Sep 2016 16:50:33 -0000
From: <john@kk9a.com>
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] LMR600 male DIN
I would not use LMR600 for the runs to the tower. Even the small LDF4 has
less loss, it is tougher, UHF, N and DIN connectors are readably available
and if purchased surplus it is cheaper than LMR600. If you care about coax
loss I would look at larger Heliax.
John KK9A
## why would ldf4..aka 1/2 inch heliax, have less loss than LMR-600DB ?
600 uses a 5.5 gauge center conductor..which is pretty big. both are foam.
stated loss from both manufacturers is almost identical. Having said that,
1/2 inch
heliax could be obtained locally pretty cheap, brand new.
## That RFS brand heliax is the bomb. Corrugated Aluminum shield...and a
corrugated
copper center conductor = very flexible. u can get it in several
sizes, up
to 1.25 inch.
Jim VE7RF
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