I am borrowing this K2. I have had it for 2 weeks. The owner just had it
back from elecraft for some issues.
It worked as advertised for almost 2 weeks. When I turned it on the other
day I got the INFO 80 message.
Looking at a few things I found that the +6 volt regulator had the output
pin not
Ed,
You may see both 4.9 MHz and some other frequencies at Q22 - it all
depends on the input signal and the VFO frequencies - thay can produce a
number of mixing products.
Do you have the problem on one band? If so, check the menu to see if RX
ANT has been turned on - that is a per band
Before supper was working. Left on and went to supper. Came back from
supper and no display but power is on. No sig heard. Turn power switch off.
When I turn it back on no display and loud hum in headphones. Then I hear some
motor boating and headphones go dead. Check input voltage. SW off
Geo,
First step --
Take the top cover (or KPA100) off and measure the resistance between
the collectors of Q7 and Q8 to ground.
What is the serial number of this K2? Alternately, how old is it.
My first suspicion is that the PA transistors have gone bad (shorted),
but your resistance
It's a sad day at KD0R. #6708 is in the hospital. I noted this
afternoon that there was only 0.1 w shown as output during TUNE. And
the outboard power meter was not wiggling. I read the manual, then
opened things back up to inspect. When I got the heat sink off the
problem was obvious.
I have not used the K2 in some time, and tonight I notice that both 60m and
40m sound dead (all signals are very weak) and I have no power output- I
have not measured with an inline meter but there is nothing on the K2
display. All other bands seem fine.
I have the KAT2 in CALS mode since I use
Stephen,
Add a capacitor to your antenna lead and use it to inject signals into
the K2 (AKA Cheap and Dirty Signal Tracing) first at W1, then at pin 3
or 5 of J13 (on the K60XV board), then at the cathode end of D6. The
first place you hear signals more or less of the proper strength will
: [Elecraft] K2 dead xmtr
Hi Don. The levels are high everywhere in the chain up through the bases
of Q7-8. Requested power is immaterial in this case, since the ALC sees
zero detected power, and therefore is pegged at 5v all the time.
I measured the levels with a scope, and divided the p-p
: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 dead xmtr
Hi Don. The levels are high everywhere in the chain up through the bases
of Q7-8. Requested power is immaterial in this case, since the ALC sees
zero detected power, and therefore is pegged at 5v all the time.
I measured the levels
unlikly because that kind of fault would drag the
receiver
way down too.
73,
Don W3FPR
-Original Message-
From: Larry Phipps [mailto:[EMAIL PROTECTED]
Sent: Sunday, December 11, 2005 10:46 PM
To: [EMAIL PROTECTED]
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 dead xmtr
Hi
because that kind of fault would drag the
receiver
way down too.
73,
Don W3FPR
-Original Message-
From: Larry Phipps [mailto:[EMAIL PROTECTED]
Sent: Sunday, December 11, 2005 10:46 PM
To: [EMAIL PROTECTED]
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 dead xmtr
Hi Don
OK. I'm hoping someone has seen this before I start tearing into things
(and tearing my hair out).
My K2 started to lose power yesterday. Within an hour, the output
dropped to close to zero (1mW on 160m, 40mW on 10m). There are no signs
of distress or burning odors.
I checked the ALC...
Larry,
Exactly where are the RF levels higher than normal? Obviously not at the
output of the Low Pass filter or you would have power output (unless you
have the tuner and have set it to ANT2 instead of ANT1 or something like
that).
With the requested power set at 5 watts, send us the RF
Hi Don. The levels are high everywhere in the chain up through the bases
of Q7-8. Requested power is immaterial in this case, since the ALC sees
zero detected power, and therefore is pegged at 5v all the time.
I measured the levels with a scope, and divided the p-p values by 2.82
to compare
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