[RFI] RFI from Astron power supply

[Dave Hachadorian]

----- Original Message ----- 
From: <rrath at charter.net>
To: <rfi at contesting.com>
Sent: Saturday, May 26, 2007 12:28 AM
Subject: Re: [RFI] RFI from Astron power supply


> The model is RS-35m. I have not made contact with the 
> company, I thought
> I would ask the people that use them first; to see what 
> you have done to
> remedy your RFI problem - - what works and what does not 
> work.
>
> The power company RFI guy and myself checked the S-unit 
> noise level on
> shore power and then hooked up to his power inverter from 
> his truck. No
> change. He then used his HF radio and a 102" whip -- for 
> receiving -- and
> the noise level; parked just outside the building and 
> about 15' away from our
> base radio, he had an s-7 noise reading. We then unhooked 
> the p.s. from
> the inverter and his HF radio dropped to an s-3 noise 
> level. Re-hooked the
> p.s. to his inverter and his HF radio jumped back up to an 
> s-7 noise.

The Astron RS-35M is a very reliable analog power supply. 
I'v been using one for years with no problems. This supply 
won't generate noise unless something is radically wrong.

I'm trying to understand your setup here. Are you saying 
that he had a power inverter hooked up to his battery and 
the noise level in his receiver increased when you plugged 
your RS-35M into the inverter? Power inverters are 
notoriously noisy. I'll bet the noise increase came from his 
own inverter, when it was loaded down by the RS-35M!

Dave Hachadorian, K6LL
Yuma, AZ









































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