[AK-VHF] LMR 400 loss at 70cm

[Paul Kiesel]

Yes, the connectors are almost certainly adding to the loss. N-type connectors are called for on 432. Also, the switch isn't helping, either. Is the switch necessary? If not, it might be possible to use less coax, too. 

73, Paul K7CW
--------------------------------------------
On Fri, 8/3/18, Brandon Clark <kl7bsc at gmail.com> wrote:

 Subject: Re: [AK-VHF] LMR 400 loss at 70cm
 To: ak-vhf at mailman.qth.net
 Date: Friday, August 3, 2018, 7:37 PM
 
 Hi Tom,
 Yep,
 something is wrong with your setup. The lost for a 25-foot
 run should
 be just under 1 decibel. I use
 that same coax extensively in my mobile
 contesting setup. What kind of connectors are
 you using, and what shape are
 they in? I
 would check that as the first thing that is likely to go
 wrong.
 
 Times microwave has
 a online calculator tool that is really useful. I keep
 it bookmarked for my various VHF projects:
 
 http://www.timesmicrowave.com/calculator/?productId=56#form
 
 Brandon
 
 On Fri, Aug 3, 2018, 18:07 Tom Elmore <tom at telmore.com>
 wrote:
 
 > Does anyone use
 LMR 400 ultra flex on 432? I am surprised what I am
 seeing
 > for loss on short cable runs. 
 My 432 transverter sits across the room from
 > the amplifier and is fed with about 13
 feet of LMR 400 then the amp feeds
 > and
 antenna switch probably another 10 feet away or so and with
 400 watts
 > out of the amp I am loosing
 almost 100 watts by the time it gets to the
 > alpha delta 2 port switch. The antenna
 analyzer isn't showing much loss but
 > the wattmeter sure is. I thought maybe I
 would loose a couple of watts
 > between
 the two different cable runs but not nearly 100.
 >
 >
 >
 > Thank You
 >
 >
 >
 > Tom Elmore
 >
 > Anchorage, Alaska
 >
 >
 >
 >
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