[Elecraft] Yet another KX-1 Question

[Glen Johnstone]

OK.  As promised.  My findings!

All component values were correct.
All soldering was done to the correct pads.
All the joints looked good....until....
 I took a really close look at T2's leads.

On the bottom they looked great but on the top (really hard to see)
they were not bonding to the pad.  Either I didn't strip off enough enamel 
or shoved the lead in too far or both.

Anyway, you folks were correct.  I applied a little heat, a little more 
solder, waited a few seconds and voila'...
You can guess the outcome.  Thanks for assist!

72,
Glen, NK1N


----- Original Message ----- 
From: "Glen Johnstone" <glen at leelynn.com>
To: "Ron D'Eau Claire" <rondec at easystreet.com>; <elecraft at mailman.qth.net>
Sent: Monday, June 26, 2006 11:14 AM
Subject: RE: [Elecraft] Yet another KX-1 Question


> Ron,
>
>  Thanks for the info.  You are correct about the testing.  I wouldn't have 
> even done my test except it 'sounded' low.
>
>  I'll be troubleshooting tonight.  I may have miswound T2 or goofed on a 
> component sub or better yet, soldered 'em to the wrong pads.  I'll post my 
> findings.
>
>  73,
>  Glen, NK1N
>
>  PS. I know you meant "origanal KX1".
>
> Ron D'Eau Claire <rondec at easystreet.com> wrote:
>  Glen, NK1N wrote:
> I agree on the receiver sensitivity. I aligned my 2 band KX-1 with a -103
> dBm signal. When I used a -73 dBm signal (standard S9), I got 4-5 bars on
> the S-meter for 40 and 20. Perfect!
>
> After building and installing the KXB3080 and doing all the RX alignments,
> I find the -73 dBm signal barely lights 2 bars on 20. Hmmm.
>
> I expect the KX1 20m circuitry was compromised to pull it down to 80m.
>
> -------------------------------------
>
> Just the opposite Glen.
>
> The receiver front end circuitry was redesigned to operate very 
> efficiently
> across the 80-20 meter range. The original KXB3080 uses a simple
> capacitively-coupled input circuit. The KXB3080 mod replaces this with a
> transfomer-coupled input.
>
> I wouldn't suggest how effective looking at the "S-Meter" is for 
> evaluating
> receiver performance. I haven't tried it. Running actual SN+N/N 
> sensitivity
> tests, I found the end result was actually slightly *better* receiver
> performance on all four bands.
>
> Ron AC7AC
>
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