Hi,
I have completed the final alignment and test of my KPA100 amplifier which is
working well in almost every respect other than relatively lower power output
on the 30m and 20m bands. Measured power output is as follows:
80m 117W
40m 113W
30m 71W - initially flashes Hi Cur message
20m 75W -
Barry,
Hard luck but do not worry, you are not alone! You are the third that
we know of in the UK and there was another in the USA. Let Gary
Surrency at support know. In my case, a scope along the RF chain showed
that there were signal voltage (and estimated current) losses across
the base
It has band pass filters in the output - similar concept to the K2/100. I
believe Eric said it is Pi-L. There is no antenna tuner in the amp.
N2TK, Tony
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Lee Buller
Sent: Tuesday, May 24, 2005 11:19 PM
To:
N2TK, Tony said
There is no antenna tuner in the amp.
Tony
I believe you are mistaken. I spent some time talking to Eric at Dayton and
also to Dick K4XU, the semiconductor applications engineer involved in the
design. They left me with a firm impression the amp has an auto-tune atu
built
Thanks for your responses. The safety belt has a new home.
73,
ed - k9ew
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Hi,
I have a question concerning antenna power and SWR. I am setting my K2
power at 5 watts via CAT. The K2 display reads 4.3 F, 0.0r. An external
watt/SWR dual meter reads 5.9 +/- 0.2 Fwd and a small value which can't be
read accurately, Rev. A Tandem SWR/Power meter reads 7.2 +/- 0.2
The question is, if the SWR is not 1:1, does the power reading which is
based on the voltage in a 50 ohms load read high or low?
It depends :-)
If the SWR is 2:1 and is caused by low impedance (e.g., 25 ohm load)
then the voltage will be lower for a given power. If the SWR is caused
by a
Chas,
Since you have the KAT2 installed, it may be simply a matter of calibrating
the internal wattmeter in the KAT2. If you are using TUNE, be aware that
TUNE may produce a power output that is different from the requested power
by up to 0.5 watts (up to 5 watts with the KPA100).
While you can
I've changed R14 to 5.6k to increase mic sensitivity using SSBA=2. I then
bought the MH2 mic which is matched to the K2. Reports said I was clipping
and degrading the audio, so I set SSBA to 1. Quality is now fine. Can I
assume that the MH2 is matched to the K2 with R14 at 1k (as original) and
I am building K2 #4901 and have just completed Assembly Phase II. Everything
checked out fine. I put the K2 on an antenna and listened to some 40 meter CW.
I observed that when the frequency changed on stronger signals, the CW note
became chirpy, as if there were two signals. I set the
Update:
After some coaching from Gary and another gentleman on the reflector, I was
able to use my wideband noise generator to inject a signal and traced it
down to one missing capacitor near U1. After that, I finished Alignment
phase II, installed the rest of the parts and completed phase II
Hi, I'm building K2 #4904 as a follow-up to my K1.
My manual says (at page 29) Some holes in the front panel was masked...
I have no mask-tape over the holes, and there has never been any tape
over the holes. It's painted grey on both sides.
What is the purpose of masking?
1) Just a
(Possibly) stupid questions:
1. Does my thru-line wattmeter indicate RMS or P-P power?
2. Are TX/Amp power output specs given in RMS or P-P?
I thought I understood this, but recent reflector traffic leads me to
question that belief.
Fred K6DGW
Auburn CA CM98lw
1. Does my thru-line wattmeter indicate RMS or P-P power?
Typically RMS, but there is a time constant involved in the meter
movement, and some versions are/can be peak reading. Keep in mind that
most wattmeters, thru-line included, don't actually measure power but
voltage induced in a
Fred and all,
Your power meter will try to show either average or peak power - no
relationship to RMS for either of these.
Extended 'TECH TALK' follows:
Power is always computed using RMS values. For power measurements, there is
some sense in referring to either INSTANTANEOUS power or AVERAGE
And that is, who has, or who is going to get K2 SN # 5,000 ?
Maybe Eric and Wayne should have had a raffle for it!
tom bosscher K8TB K2 SN 3206
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I have built 90 K2's to date, and many of the other Elecraft kits. Let me
build your radio. My rates are reasonable and you get a built radio ready to
play.
73
Alan
W1HYV
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- Original Message -
From: Tom Bosscher [EMAIL PROTECTED]
To: Elecraft@mailman.qth.net
Sent: Wednesday, May 25, 2005 1:34 PM
Subject: [Elecraft] What I forgot to ask at Dayton...
And that is, who has, or who is going to get K2 SN # 5,000 ?
Maybe Eric and Wayne should have had a
Oh, no, I was not hoping for full power out with 5W in. I was just wondering
if I could expect up to 100W out with 5M in (assuming a max 13dB gain), or is
it somehow limited or inefficient with such low drive power. I would just like
to have only one amp I could use to bring something like a K1
I asked if #5000 was available when I bought #4941 at Dayton and the lady
helping me actually went to the stack of K2 boxes and looked to see if it
was there. I got the impression she would have handed it me if it had been
there. She said she didn't see it. It's possible it's not that big of a
Yes folks, my K2 finally is ready with all options: SSB, Noise-Blanker,
DSP, 160 m and 100 W-PA. I finished it 5 minutes ago. Everything is
working well. The few things, that did not work right from the beginning
had my own stupid faults as their reason. For all this, I spent about 55
hours.
Buy a KPA800 AND a KPA1500 and get full legal output for 5W drive.
Sounds ideal.
David Toepfer wrote:
Oh, no, I was not hoping for full power out with 5W in. I was just wondering
if I could expect up to 100W out with 5M in (assuming a max 13dB gain), or is
it somehow limited or inefficient
On Wed, 2005-25-05 at 18:27 +0200, Erik Linder wrote:
My manual says (at page 29) Some holes in the front panel was masked...
I have no mask-tape over the holes, and there has never been any tape
over the holes. It's painted grey on both sides.
The holes that are masked are in the four
My first trip to Dayton Hamvention the highlight was getting to meet
Eric, Wayne, Tom Hammond (N0SS), Lerma, others who were helping show the
K2 all its brothers sisters. Eric showed me photos of the K2
afterburner.
(I also met Chip of Tonight Show fame a teenager who had one $64K? on
That was going to be my question...if it is controllable from the K2
like the KPA100 is. Sort of like the transverters, designed for the K2, but
can be used with other rigs.
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL
G'day all,
All this talk about 800W amps is interesting, however, due to oil prices
the power company here has had to shove up the price per kWh to about 27c
US. I'll stick with more and better high level aluminium which sucks as
well as blows. Less potential TVI too.
Regards,
Mike VP8NO
Balanced Line Tuners
I don’t think you really want an Automatic tuner from Elecraft -- unless
they perhaps decide to venture into a new nitch in terms of a superb KW tuner
that works well with their and other radios.
First the reason that I say KW TransMatch is that you have to think in
I agree, but, some of us have no room/permission for an antenna that is worth
anything, and have to make up for it somehow.
dt
.
--- Mike Harris [EMAIL PROTECTED] wrote:
G'day all,
All this talk about 800W amps is interesting, however, due to oil prices
the power company here has had to
On May 24, 2005, at 11:19 PM, Lee Buller wrote:
It is 80% the size of an Alpha
So, is that 80% of the external dimensions, or 80% of the volume?
Is this the size of an EC2, or considerably larger?
Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED]
Quote: Not within a thousand
Hey Elecrafters,
One of the things that followed me home from Dayton was an Elecraft Hex Key.
Eric mentioned that there is a fella out there who makes covers for it.
Would some kind soul post the email or web address of the cover maker?
72,
Preston Douglas WJ2V
My electric bill came today and it worked out to 11.7 cents/kwh. I suppose I
could then afford to run a kw, but as you say, a bunch of aluminum up high
(TH7DX @ 65') works both ways. With a linear, you pay so that the guy at the
other end has an easier time of it!
It's not going to be on my
Is there a possibility of one for 70cm
would love one!
George NE2I
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I need a little assistance from other KX1 builders out there.
The manual states to solder the capacitor C56 between pins 2 and 3 of the
relay K1 (page 34, right side, second step).
How do I determine which pins are 2 and 3? I DON'T want to get this wrong
now...
Thanks.
Matt - K7OE
Let us look at the matter in a different way. The skill required in the
construction a real QRO solid state power amplifer is different. KPA800
will be an entire different training for myself as a non-radio profession.
Cheers,
Johnny Siu VR2XMC
- Original Message -
From: EricJ
4933 has been inventoried, only a couple parts MIA no biggie. I can't wait
to put the kit together.
I am overwhelmed by the vastness of the kit. I have only built 1 kit with
through hole soldering solder joints on both sides of the board
the kit was a M3 semiconductor tester and that was a breeze
On Wed, 2005-25-05 at 17:04 -0700, David Toepfer wrote:
I agree, but, some of us have no room/permission for an antenna that is worth
anything, and have to make up for it somehow.
You've got it good! Right now I've got no antenna at all.
I'm away from home for about 15 months, living in an
Training for what? You're only going to do it once!
Eric
KE6US
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
JS
Sent: Wednesday, May 25, 2005 6:39 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] kpa800 question
Let us look at the matter in a
The construction technique and tuning procedures would be different from K2.
It should be an interesting construction experience.
73
Johnny Siu VR2XMC
s/n 1146, 4165, 3837, 4255, 4597
- Original Message -
From: EricJ [EMAIL PROTECTED]
To: 'JS' [EMAIL PROTECTED];
Hi George,
I suppose you mean specifically an Elecraft transverter. I've used the
Down East Microwave transverters in the past and they worked great.
Were also lots of fun to assemble. Taught me that SMD are not so bad
(the density was quite low). You can find them at
The MH2 is now listed as discontinued. Will there be an Elecraft-branded
replacement for those who don't fancy pop star type microphones?
73 Paul ZL3IN
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Definitely. It should be fun. And when you let the smoke out, you REALLY let
the smoke out. Hi.
73, Johnny
Eric
KE6US
-Original Message-
From: JS [mailto:[EMAIL PROTECTED]
Sent: Wednesday, May 25, 2005 7:16 PM
To: EricJ; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] kpa800 question
Matt,
If you look at Fig 13 on page 34, you will see a 'solder
blob' just above the letters 'CB' - the next two 'blobs' to
the right of that are pins 2 3.
If you download the pdf version of the manual,you can word
search and 'expand' the illustrations to make them VERY
clear...
Hope this
Great idea! Elecraft could donate the proceeds to a charity. It would be
a win-win, they get good press, the charity gets a nice contribution and
someone gets K2 #5000.
Tom WB2QDG
k2 1103
- Original Message -
From: Ken Bessler [EMAIL PROTECTED]
To: Elecraft Main Group
SN 5000 should have Wayne and Eric's signatures engraved on the top
cover - or maybe that would be a good idea for a 10th anniversary
special edition K2?
73 de Larry W2LJ
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Matt - K7OE - asked:
I need a little assistance from other KX1 builders out there.
The manual states to solder the capacitor C56 between pins 2 and 3 of the
relay K1 (page 34, right side, second step).
How do I determine which pins are 2 and 3? I DON'T want to get this wrong
now...
Brian, VE7NGR, asked:
...Right now I've got no antenna at all.
I'm away from home for about 15 months, living in an 11x15 foot room. It's
basically the equivalent of a small hotel room. It's on the 3rd floor and
has a window, but no balcony. It's probably not a great idea to string wire
out the
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