FW: [Elecraft] K1-4, Low Power on 1 Band only

[Richard Klingensmith]

Randy,

I had some similar problems while building my K1. I found I had a bad solder 
joint in a couple of capacitors in the Premix filter of the filter board. I 
believe it was c22 but I'm not sure without a diagram to look at. My problem 
was intermittent output on 30m and I believe I had low output sometimes. I 
didn't find it until I started wiggling parts as a last resort.

Good luck.

Rick
WA3TUU
K1 1859


>From: Randy Tompson <rtompson at infionline.net>
>To: elecraft at mailman.qth.net
>Subject: [Elecraft] K1-4, Low Power on 1 Band only
>Date: Wed, 14 Jul 2004 20:57:46 -0400
>
>Thanks for any advice anyone can give me.  I'm certainly no EE....  I've 
>reviewed the past couple of years of archives for this reflector, and 
>haven't found my exact problem spoken to.
>
>I purchased a K1-4 on eBay, and find it has sufficient power on 3 bands, 
>but low power on 1 band.  My seller says he'll stand behind the sale, that 
>he was unaware of the problem (didn't use 30 meters).
>
>mHz       Power out (OUT set for 5.0 watts)
>====	    =============================
>7.075             5.0
>10.075           1.3   (transmitting into an Elecraft DL1)
>14 .075          5.0
>21.075           3.8
>
>I have good audio volume on 30 meters.   Power output is correct for OUT 
>settings below 1.3 watts, limits out at 1.3 watts for OUT settings above 
>1.3 watts.
>
>Each of the tests I've run already has failed to isolate a problem:
>
>a.  Correct capacitor value markings on C22 thru C34
>
>b.  Correct # turns on L4, L5, and L6
>
>c.  Visually inspect solder joints, L4 thru L6, C22 thru C34, C1 thru 6, 
>CA-CH.
>
>d.  Continuity/solder connections L4, L5, L6
>
>e.  Correct 30 meter crystal value markings.
>
>f.  Visually inspect 30 meter crystal solder joints, crystal can ground 
>solder joints.
>
>g.  Peak 30 meter filter trimmer caps (C5, C6, CE, CF) while transmitting 
>at OUT = 2.0 watts.
>
>Again, thanks in advance for any advice...
>
>Randy Tompson
>WA4CIT
>K2 1086    K1 85     K1-4 1505 (on 3 of 4 bands)
>
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