[AK-VHF] LMR 400 loss at 70cm

[Brandon Clark]

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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