On 9/29/2012 9:12 PM, Robert G. Strickland wrote:
> What I'm curious about is whether some such device, at the feed point of a
> doublet,
> in turn fed by window line is of any use [assuming an appropriate tuner at
> the radio
> end of the line]. You have said, accurately so, that a current choke
I have the KX3 #1877. It came with AFX MOD already set to delay.
I still have VFO A tuning noise beginning at 20M. Sometimes low on 20.
Sometimes moderate. But, as you move up the bands, it gets progressively worse.
This tops my very short list of "things I'd like changed". I really hope it's a
On 9/30/2012 12:02 AM, Jim Brown wrote:
> YES! That is EXACTLY what I have repeated, over and over again. It has
> NOTHING to do with coax. Coax, if it is not decoupled by a common mode
> choke, simply ADDS to the imbalance that is already present. EVERY
> transmission line needs a common mode
There was recently a short exchange about the suitability of new
machines running WIN 7 for station use. I was in the process of taking
delivery on a 3rd generation work-station running WIN 7 (32) to replace
a "terminal" DELL XPS 420. I have now checked the new machine out on my
station functio
Phil,
It is great that you actually know the length of your feedline - most do
not.
I am not questioning how well your antenna/feedline combination works.
All I am trying to get across is that for any claims about how easy a
particular antenna is to tune (with a tuner in the shack), the length
Mike,
I picked up on your "horrible antenna" words.
Yes, with no antenna, or a "horrible antenna", you may hear some VFO
tuning noise in the KX3, but that is usually covered up by band noise
with a normal antenna connected (except on 6 meters and maybe 10 meters
where the band noise is low).
Y
For Sale – K1-4 with the following options. I started 1 Circuit Board,
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Noise Blanker. I paid
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David casualobse
As I am not sure of this stuff I need to ask the following question.
The example below is based on a doublet antenn which has a feed point of
close to 50 ohms. So the ladder line is not what you want to transform
so I understand that a 1:1 is correct.
However if you have an antenna such as a
> In the old days, when RFI did not exist (few of us are old enough not
> to remember TVI in the 50s), the Windom MIGHT have been a good idea.
> Today, with RF noise sources everywhere and home stereo rigs full of
> Pin One Problems ready to bring RF into equipment and detect it,
> Windom antennas
Don,
You must think "system" rather than individual components. Also with
antennas and feedlines, the "where is it connected" is a required parameter.
A halfwave dipole in infinite space has a feedpoint impedance of 70
ohms, but brought down to practical heights, the feedpoint impedance is
cl
Is there any problem operating the KPA500 vertically rather than
horizontally (handle side up)?
I operated most of the TX QSOP yesterday at around 500 watts, and only
saw the temperature reach about 50 degrees C; however, the upper right
part of the case did get warm.
- 73, John, N0TA
_
> However if you have an antenna such as a loop which has a feedpoint
> impedance of closer to 200 ohms then a 4:1 would make sense to me.
> The reason is I need to reduce the feedpoint resistance of the
> antenna as I do not change the resistance based on the feedline.
The "problem" with this lo
Let me rephrase what Joe is stating - in an unmatched feedline
situation, the feedline characteristic impedance is not to be
considered. It does not matter whether it is 50 ohms, 300 or 450 ohms -
that characteristic impedance is NOT what is being matched. The feedline
acts as an impedance tra
On 9/30/2012 5:37 AM, gold...@charter.net wrote:
> So am I correct in my understanding or just totally out in the weeds.
There may be more to it than that. First, no matter what feedline or
matching system you use, there should be a serious common mode choke at
the feedpoint. Second, is this a
Thanks to all who answered. The problem turned out to be too much
voltage drop. I bypassed the terminal strip between the PS and the rig
and all is well.
73, Mike NF4L
On 9/29/12 11:52 AM, Mike wrote:
> This morning while playing in the RTTY 'test, I answered a CQ by sending
> my call nine time
> in an unmatched feedline situation, the feedline characteristic
> impedance is not to be considered. It does not matter whether it is
> 50 ohms, 300 or 450 ohms - that characteristic impedance is NOT what
> is being matched.
That's incorrect. The feedline characteristic impedance *must* be
con
I believe Joe meant to say "...higher impedance results in lower currents..."
--[snip]
Within limits, most tuners are better able to handle high impedance
mismatches than low impedance mismatches because losses tend to be
resistive in nature and the lower impedance results in lower currents
and t
Am running my fairly new kpa-500 in the rtty contest. It is situated out
in the open.
it from 220v and during the run it's current runs at 10a and 64-74v. The
temp starts at 35c and as I run it slowly creeps up to 55-57c and kicks
out with the error message of "Pwr In High".
I'm only driving t
Dwight.
Something is wrong. Mine at 400-500 watts gets to about 65C during
bunches of RTTY CQ's. It probably can go higher. Fan kicks in at
expected values. 240v line.
73 de Brian/K3KO
On 9/30/2012 14:53, DGB wrote:
> Am running my fairly new kpa-500 in the rtty contest. It is situated out
>
My specs:
250 watts out
10 watts drive
64 volts
8.5 amps
240 V line
Temp has got up to 52c @ 300 watts.
Haven't seen any warnings, but the fan kicks in more often as expected.
I'm uneasy running it at 500 watts during a contest.
Joe Hutchens ( AJ8MH )
http://webpages.charter.net/aj8mh-
I thought about this for a couple seconds... I have seen some rigs have
a rather large difference in power out between mark and space tones.
With a small difference in drive I would expect to see a large
difference in power out of the amp with these radios. I've also heard
some radios with a
Hmmm... I run my KPA500 @ 500W on RTTY most of the time. 120V AC. 15/10 I
usually run barefoot @ 100W. KPA500 tops out @ ~68C. Sounds like somthing is
wrong for you.
73,
Fred K6DGW
Sent from my Samsung Epic™ 4G
DGB wrote:
Am running my fairly new kpa-500 in the rtty contest. It is situat
Good afternoon all, almost done putting my KX3 kit together I have the roofing
filter installed and when asked to on page 32 of assembly manual to fit the top
and bottom covers of the KX3 I have a fitting issue. The top left is not
fitting flush as is the top right corner is. It seems to me the
> The temp starts at 35c and as I run it slowly creeps up to 55-57c and kicks
> out with the error message of "Pwr In High".
does it read 35 degrees C when the amp is cold? and is it that hot in
your shack?if this is the reading from a cold start I am guessing
the temp sensor is not cal
On 9/30/2012 7:53 AM, DGB wrote:
> Anyone have a similar problem, makes it useless for rtty contesting and
> running. No problems in CW contests at full bore!
Something is broken. I get 500W out on 6M (the most difficult band)
with modes like JT65, ISCAT, and FSK441 for 48 seconds on each
tran
Hi Mike, I had to file off the small bumps on the edge of the filter circuit
board to get mine to fit properly. This was okayed by Elecraft. Be sure to
wear an ESD strap while doing this. Just a thought. Todd
Sent from my iPhone
On Sep 30, 2012, at 11:41 AM, Mike Weir wrote:
>
> Good afte
Elecraft CW Net Report for September 23rd & 24th, 2012
Good Afternoon,
We had a good twenty meter net last week as shown by the following
list. Conditions were good into many places. Some QSB but it was
fairly slow. Forty meters was better than it had been too. However,
when the net sta
I love the KX3 and especially the RX I/Q output feature which I run into
HDSDR. I would like to always use the KX3/panadapter as my visibility into
the band but occasionally use another 100W rig for transmit. (Until the
Elecraft 100W PA is available.) I would like to be able to use something
like
John,
In theory, you shouldn't have any issue running older 32-bit
applications on a Win7 x64 computer. The 64-bit processors (and
theoretically the OS) are designed to handle running 32-bit
applications, albeit slightly less efficiently than 64-bit apps.
Just thought I'd throw that in for go
The only issues you might find are the really old 16 bit programs and DOS
ones.
Fred/N0AZZ
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ian Kahn - Ham
Sent: Sunday, September 30, 2012 4:26 PM
To: tpcj1...@crocker.com
Cc:
Hi, Ian...
I know that most applications will run just fine on a 64-bit machine. I
was worried about applications, e.g. add-in cards, that require separate
drivers. Some that I have seen are marked that the driver is 32-bit only
and that it won't run on the 64-bit machines. I have a couple of c
Hi Mark,
if using separate antennas as you describe, why don't you simply key the KX3
to TX at the same time you key the other TRX? You could even reduce the
KX3's power to 0 watts. Should be the simplest solution, just share PTT
between both, no need for an firmware option. ;-)
73, Olli - DH8
Olli,
Excellent idea! I just tried it and it works well. I think rather than
setting the KX3 up for 0.0W transmit, I'll leave that setting alone and turn
VOX off. That way I won't be unnerved by having the TX light illuminate and
I'll also have the VOX/no VOX indicator on the screen that I can
Hi OM,
I presume you're using the BY-1 alone without an external keyer? If so, tap
the K2's MENU button, scroll through the Main Menu options until you reach
INP (for the key/paddle INPut), then hold EDIT (same button), then select
PDLn if your paddle is wired "normally." Tap the MENU button twic
__
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I don't trust any computer that weighs less that 5lb, but then I
don't text while driving, carry on a conversion on my cell phone
while having dinner with a friend or play games on an iPod at the
symphony. If I did I might feel I needed a tiny computer.
73,
Tom
Amateur Radio Operator N5GE
ARRL Li
Hi Gang:
I think I am experiencing an issue with the sub receiver on my K3. On all
bands but 10M I can set the A VFO and B VFO to the same frequency and hear
good audio on A and B VFOs. Even with a strong signal, on 10 M I *sometimes
do not hear the signal* (Typically SSB) on VFO B. On all but
Hi;
I have K2 ser. # 5621 and the KPA 100 which was working perfectly.
Now when I push the ptt switch on the mike, I get no indication of output
either in high power or low power.
The ammeter on the p/s does not move.
Does someone have an idea where to check?
Earl, VE3VI
_
Hi Dave,
This is most likely a difference of antennas between A&B receivers. I
had the same problem at first too, with this K3. Maybe your sub RX
antenna doesn't work so well on 10m? Swap antennas between A&B, then
see what happens on 10m. The sub RX audio should take the place of
main RX if i
Check lo/hi bandwidth setting of vfo B on 10m band. Probably you have a
very narrow setting on vfo B for this band
Edu yy4gmj
On Sep 30, 2012 8:52 PM, "Dave Weiss" wrote:
> Hi Gang:
>
> I think I am experiencing an issue with the sub receiver on my K3. On all
> bands but 10M I can set the A VFO
I ran RTTY on my K2/100 for several years at 100W. I did the same thing
as Mark. An old computer muffin fan with a little screen over the top
velcro-ed to a small patch on the KPA100 heat sink ... right rear area,
if I remember correctly. It blew down on the heatsink, made no noise
that I co
Don (and others),
One problem down, one to go.
I believe I have solved the modulation issue. I started fresh and did all
alignments, from Freq calibration, PLL, Filters, BFO passband (with your
excellent descriptions on how to use Spectrogram). Especially the BFO was way
off. I am not sure i
In a recent message, John Ragle writes
>
>I know that most applications will run just fine on a 64-bit machine. I
>was worried about applications, e.g. add-in cards, that require separate
>drivers. Some that I have seen are marked that the driver is 32-bit only
>and that it won't run on the 64-bit
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