[Elecraft] Is it just me?
Charlie T, K3ICH
pincon at erols.com
Thu Jan 26 16:18:01 EST 2017
I tend to agree on not needing an antenna mounted pre-amp for 50MHz unless
you have exceedingly long feed-lines, or, very serious about EME.
I have about 85 feet of regular old RG-213 to the beam and so far, 153
countries confirmed on six along with WAS & WAC.
Conversely, I have Landwehr pre-amps at the antennas for 144/222/432.
Even though the feed-line on 432 is 7/8" Heliax, switching on the pre-amp
makes a noticeable difference.
When I had a regular K3, I didn't see a lot of difference between the
Elecraft outboard pre-amp and the ARR unit.
That said, my new K3S does not need the external pre-amp since it basically
has the equivalent built-in, which is another BIG plus for going with the
later version K3S.
73, Charlie k3ICH
-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Josh
Fiden
Sent: Thursday, January 26, 2017 12:46 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Is it just me?
3 dB feedline loss is not a practical number. At 6m I run only hardline, 90'
of 1/2" for terrestrial and about 75' of 1-1/4" for EME. Loss is <<1dB. If
you keep your eyes open, surplus low loss feedline is not expensive. Putting
a preamp on the tower with appropriate sequencing & isolation, especially if
you run QRO, is more effort/cost/maintenance.
Hard to justify at 6m.
73,
Josh W6XU
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