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Re: [TowerTalk] [Amps] Response the "QSK switching time"

To: "kingwood" <>
Subject: Re: [TowerTalk] [Amps] Response the "QSK switching time"
From: "Bill K2OWR" <>
Date: Fri, 18 Dec 2009 17:29:37 -0500
List-post: <">>
:::: When I originally asked this question I mentioned that I needed a 12' 
So buying anything shorter would involve a method to join them, plus the 
shipping cost, which was part of the big problem.
In my case 6' or 8' still does not fit my need.
----- Original Message ----- 
From: "kingwood" <>
To: "Amp Reflector" <>
Sent: Friday, December 18, 2009 15:53
Subject: [Amps] Response the "QSK switching time"

> Greetings to all,
>        I started responding to each reply off line.  I am getting so many
> responses, and most are similar, so I am responding through the reflector.
>        The idea of increased IMD is something I have not considered.  I
> would certainly think that PIN's would be much better, in this respect, as
> they are much cleaner mixers than PN diodes.  But, how much cleaner is
> cleaner?
>        The idea of proper forward biasing is something that I have
> considered, and I certainly agree that switching diodes must be turned on
> "HARD" (Yes, I got it too), and had to avoid rectification during 
> switching.
> Both the HeathKit and Ameritron boards use 12 volts for forward biasing.
> Any comments would be appreciated.
>        I have to comment on Carl's thread.  I have not been able to get
> through to them lately, either.  My bone with them is that their Quality
> Control is awful, almost non-existent.  Since I have started messing with
> QSK, I have bought two QSK-5, stand alone units, from them.  One was dead
> right out of the box and the other failed within the first week of
> operation.  The one that was dead out of the box was caused by a short of 
> on
> the board from mounting too close together.  This one took out two PIN
> diodes an two of the hi voltage switchers.  The other one was simply cold
> solder joints.  I see this regularly on boards send in for me to repair.
> Often, just repositioning components, and/or reheating solder joints fixes
> the problem.  I do not think that new products should come out of the
> factory this way.  Antenna tuners should not be sold with a rating of 1500
> watts, when in actuality, their coils get so hot with 1500 watts that the
> solder melts and flows away, leaving an open circuit because there was no
> physical connection made before soldering.
>        Now, on the other side of the issue, I certainly do recognize the
> good that they do for the Amateur Radio Community, at large.  I just wish
> they had a little better quality control.
> 73 de Lon, K5JV
> 1110 Golden Bear Ln.
> Kingwood, TX 77339
> 281-358-4207
> 281-358-4234 FAX
> 281-795-1335 CELL
> _______________________________________________
> Amps mailing list


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