[Elecraft] K2/100 RFI problem using Astron 20A

[Stewart Baker]

Used to have a Windom up here. The RF from it got into everything:-
K2 PSU, Computer, UPS, Telephone and Alarm system.
Changed to a balanced (Doublet) antenna, end of problems.

73
Stewart G3RXQ

On Thu, 8 Dec 2005 12:04:13 -0000, Paul Webb wrote:
> HI Tom
>
> It seems to happen more when the ATU needs to work harder to find a=
 match,
> I have a 40m Windom up here and I can load it on all bands with the K2,=
 but
> it has to work hard to get me a match on 160m/80m and this is normally=
 when
> it happens, its not a problem since I put a float battery across the=
 PSU's
> output.
> I have had it mess up some of the settings too on my K2 when it happens,
> mostly on the DSP settings like turning the RTC menu option to OFF
> All the best
> Paul
> M0BMN
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Tom Althoff
> Sent: 08 December 2005 10:34
> To: elecraft at 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 W3FPR for advice
> before I tore the radio apart.   He pointed me to the sidetone source=
 menu
> and I got it working again.
>
> My problem ONLY occurrs on 40M.   Is yours band specific Paul?
>
> My DC wire between the Astron and the K2 is 18 inches which is how far=
 apart
> I keep the units.  It also has a large ferrite filter around it.
>
> Tom K2TA
> Greenwood Lake, NY
> K2/100 #1117
>
> ----- Original Message -----
> From: "Paul Webb" <m0bmn at yahoo.co.uk>
> To: <elecraft at 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=92t 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 to find a match the current drawn would
>
> Go up and down as you would expect as the load changes.
>
> 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 through its tune cycle .
>
> I was going to look for a better PSU , till I found how much a new one=
 was!
>
> So in the end I have a 17AmHr Gell pack here that I float across the=
 PSU=92s
> 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.
>
> I guess others have found the same problem?
>
> 73
>
> Paul
>
> M0BMN
>
>
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