[Elecraft] Problems on 40M with 100 watt section

[Rich McCabe]

Also, just noticed the book says the CAL CUR should be set for 3.5A. Mine 
was down to 2.5. I am guessing some software I am testing did this. But now 
that I have that bumped up, my current is much higher. Like 3.25.

Rich

----- Original Message ----- 
From: "Rich McCabe" <r.mccabe at 1967z28.com>
To: <elecraft at mailman.qth.net>
Sent: Saturday, March 18, 2006 7:58 PM
Subject: Re: [Elecraft] Problems on 40M with 100 watt section


> Well as it turns out, my current draw is high. About 2.48 according to the 
> K2 display. This was at around 8 watts (2:00 position) on the band I 
> checked. But all bands appear to be around that 2.45-2.5 range.
>
> I checked the finals to make sure there is no short to ground and they did 
> not. Although there was about 3.5 K resistance on both of them. I assume 
> this is normal.
>
> I checked the voltage on the finals during xmit and they were 13.4,  .6 
> and 0 as they should be.
>
> Time to search the archives. Any comments would be appreciated.
>
> Rich
> kd0zv
>
> ----- Original Message ----- 
> From: "Ron D'Eau Claire" <rondec at easystreet.com>
> To: "'Rich McCabe'" <r.mccabe at 1967z28.com>
> Sent: Saturday, March 18, 2006 5:49 PM
> Subject: RE: [Elecraft] Problems on 40M with 100 watt section
>
>
> Yeah, you definitely have a problem "farther up the line" from the KPA100.
> You should see 10 watts, minimum, on all bands from the basic K2. I'd 
> start
> by physically removing the KPA100 and testing again.
>
> In addition to feeding power from only the coaxial plug, you can disable
> your KPA100 by going into the secondary MENU commands. Also, it does not
> kick in until you set the POWER control at 10 watts or above even with the
> high-current supply enabled. You can hear a relay click when the KPA100 is
> switched in.
>
> But you've determined that the problem is not in the KPA100 itself. Not 
> this
> problem at least. First you need to make your K2 produce 10 watts or more 
> on
> all bands without it. Ten meters is usually the lowest output band with 
> some
> K2's barely making 10 watts, but on other bands, especially 40, most K2's
> will produce closer to 15 watts at full power.
>
> Do you hear relays switch when you change bands?? One thing that causes
> frequency-specific issues in K2's is if something is amiss in the circuits
> that switch in the correct output filter for each band.
>
> Ron AC7AC
>
> -----Original Message-----
> From: Rich McCabe [mailto:r.mccabe at 1967z28.com]
> Sent: Saturday, March 18, 2006 3:23 PM
> To: Ron D'Eau Claire
> Subject: Re: [Elecraft] Problems on 40M with 100 watt section
>
>
> Ron and Tom,
>
> Tom, yes have a scope and can resport to that if needed. Not an expert 
> with
> it, but can make it work :)
>
> Ron, I tried doing the low power thing as you suggested by removing power
> from the 100watt unit and using the small Power cord.
>
> 160 was 9 watts, 40 was 6 watts. The rest of the band went into HI CUR as 
> I
> rotated the dial up to about 1 or 2 oclock and got to 7 or 8 watts.  So 
> the
> "problem" is further up the line than I thought.
>
>
> 73,
>
> Rich
> kd0zv
>
> ----- Original Message ----- 
> From: "Ron D'Eau Claire" <rondec at easystreet.com>
> To: "'Rich McCabe'" <r.mccabe at 1967z28.com>; <elecraft at mailman.qth.net>
> Sent: Saturday, March 18, 2006 5:01 PM
> Subject: RE: [Elecraft] Problems on 40M with 100 watt section
>
>
> You should see 100 watts on ALL bands so, yes, those are down. Are you
> making a minimum of 10 watts out on all bands with the KPA100 disabled?
>
> I don't have a KAT100 myself, so I won't speculate on what might have 
> caused
> your original issue beyond the obvious observation that, apparently, it
> wasn't really out of the circuit in some way. It may not have been tuning,
> but clearly there wasn't a 50-ohm non-reactive path through it either.
>
> Ron AC7AC
>
> -----Original Message-----
>
> Ron,
>
> This was into a dummy load.
>
> I had it into the KAT100 which was disabled and unplugged. So only the
> feedline was left connected though the ATU. Once I removed the KAT100 it
> worked.
>
> With the AT removed I did check power output into a dummy load and got the
> following
>
> 160- 131 watts
> 75- 118 watts
> 40- 119 watts
> 20- 54 watts
> 17- 55 watts
> 15 -98 watts
> 12 - 78 watts
> 10- 99 watts.
>
> So 20 and 17 are down and 12 slightly??
>
> So I am thinking it must be ATU related and not the 100watt amp section.
>
> Thanks
>
> Rich
> kd0zv
>
>
>
>
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