This summer I experienced an RFI problem with my
Astron RS-7A which was completely cured by connecting
the negative output terminal to the ground stud on the
back of the supply. Never had to do that before in
perhaps 15 years of owning the power supply - didn't
even know the supply was floating
Ron AC7AC posted:
When adjusting an antenna tuner, always tune up at reduced power. Ideally,
use only the minimum power needed by the SWR bridge. When faced with severe
SWR conditions such as exist while adjusting the tuner, almost any rig will
draw excessive current.
That is my
Hi
I thought I may have had a RFI problem with my K2/100 that I recently bought
but it wasn’t that.
When I hit the tune button sometimes the K2 would start tuning and then half
way through do a reset.
In the end I measured the current into the 100 watt stage and found that
as the tuner tried
- Original Message -
From: Paul Webb [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Thursday, December 08, 2005 4:31 AM
Subject: RE: [Elecraft] K2/100 RFI problem using Astron 20A
Hi
I thought I may have had a RFI problem with my K2/100 that I recently bought
but it wasn’t that.
When I
December 2005 10:34
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2/100 RFI problem using Astron 20A
I have the Ten-Tec Orion supply which is an Astron 20A and also experienced
that symptom as recently as yesterday. When I run on a car battery I do not
notice it.
After the reset I lost my
@mailman.qth.net
Subject: Re: [Elecraft] K2/100 RFI problem using Astron 20A
I have the Ten-Tec Orion supply which is an Astron 20A and also experienced
that symptom as recently as yesterday. When I run on a car battery I do not
notice it.
After the reset I lost my sidetone. Luckily I asked Don
Off center feeding of a dipole antenna greatly enhances feed line radiation
which most often causes a new set of problems. This is why you usually see
the Windom style type antennas having to use some form of a line isolator in
the feed line. It's much simpler to stay with center feeding
If the K2/100 is properly fused according to the instructions, it should not
draw more than 20 amps without opening the fuse!
Perhaps the crowbar voltage on the supply is set too low?
Why not tune up at reduced power?
Ron AC7AC
___
Elecraft
Paul Webb wrote,
I thought I may have had a RFI problem with my K2/100 that I recently bought
but it wasn’t that.
snip
But I found that my 20 amp PSU could not cope with some of the very short
current drain that it was asked for and dropped its voltage which caused the
k2 to reset half way
Steve, W2MY wrote:
Just a note to all about Astron Power supplies in general. The Astron
linear power supplies that I have owned were very nice, but please realize
that the 20 in in their name, I believe, is for a tempory peak amount of
amps...
Is the supply linear or a switcher?
So far, no one has asked!
On Dec 7, 2005, at 7:15 PM, Elmore's wrote:
I am in the testing phase of my KPA-100 construction using an
Astron 20A power supply. When I attempt to adjust the power of the
K2 in Tune mode it will reset at levels between 40-90W
So in the end I have a 17AmHr Gell pack here that I float across the PSU’s
output this will help the PSU cope with the odd high current pulse and also
act as a standby Supply in the event of a mains failure.
That's what I do, except that the battery is bigger (80 AH or so). My
theory is
I am in the testing phase of my KPA-100 construction using an Astron 20A
power supply. When I attempt to adjust the power of the K2 in Tune mode it
will reset at levels between 40-90W depending on the band selected. I tried
adjusting the power using a battery and I was successful to 100W
Jim,
The first thing to check in a situation like yours is the DC path from the
power supply and inside the supply itself. The entire DC path must have a
very very low series resistance - if it does not, the voltage will sag
drastically under load and the K2 will shut down due to the
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