[Mich VHF UHF Society] RF Attenuator

Roger Cox rgcox2 at gmail.com
Fri Feb 26 10:38:27 CST 2016


Mike,

Here is a nice online attenuator calculator:
http://www.microwaves101.com/encyclopedias/attenuator-calculator

Also, as Tom mentioned, small coax cable (RG-178, RG-316, RG-58, etc.) is a
good attenuator at VHF and UHF.
http://www.timesmicrowave.com/calculator/

73 Roger W8IO

On Fri, Feb 26, 2016 at 11:14 AM, Tom Bosscher <tom at bosscher.org> wrote:

> Mike,
>
> Two ideas,
>
> 1. Attenuators and dummy loads are relatively cheap on Ebay.
>
> 2. Got some RB-58? Make your very own attenuator based on the length of
> the coax. I had to drop a broadcast Fm exciter output by 3 to 4 db, and I
> use 100 feet of RG-58 to do that.
>
> Tom K8TB
>
> p.s., I would set the attenuation level based on the regular power level
> of the exciter/driver. That way you don't have to worry about pulling back
> the power, ever.
>
>
>
> On 2/26/2016 11:07 AM, C. Michael Long wrote:
>
> I recently picked up an old MMT 1296-144 transverter.  This particular
> transverter takes a maximum of 300mW input.  I am currently unable to test
> it since the lowest output on my radio is 1W.  I am looking for tips,
> equations, etc on how to design and build an attenuator to both test and,
> if it works, eventually use this transverter.
>
> Thanks,
> Mike
> W6RP
>
>
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