Was KPA500 RF output wiring:
Gary there are several distinctions:
First there is a difference between a jumper and a transmission line. For
short distances you will have perturbations at the start and finish that
will average out because you do not really establish the transmission line
effect. Lo
Iain, I use a Power Mite from Walters & Stanton when not in the shack - is very
quiet, both physically and RF wise
73 de M0XDF, K3 #174, P3 #108, KX3 #???
--
It came to me that reform should begin at home, and since that day I have
not had time to remake the world. -Will Durant, historian (1885-
Fred Townsend wrote:
>
> Rubber (parallel) lamp cord can be used as transmission line and it is
> cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness.
>
True, but it has very high loss (especially at higher frequencies) and
should only be considered as a last resort. About 10 years
A few years ago, I measured a length of plastic (some form of vinyl, I
believe) insulated zip cord with the loss results below.
Impedance over the range 300 KHz - 30 MHz varied from 118 ohms to 124 ohms.
Jack K8ZOA
Frequency MHz Loss (dB)/100 ft
5 2.3
10 3.5
15 4.6
20 5.
Has anybody pushed the 500 limit on RTTY with the KPA500?
Especially in a contest.
I noticed that the fan does accelerate when using HP on RTTY.
Just wondering how the amp would hold up under 400-500 watts running on
RTTY.
Bob, W1EQ
__
Yes, the KPA500 runs cool at 500 watts all day long in a RTTY contest, as
designed.
Ed - W0YK
Bob, W1EQ, asked:
> Has anybody pushed the 500 limit on RTTY with the KPA500?
>
> Especially in a contest.
>
> I noticed that the fan does accelerate when using HP on RTTY.
>
> Just wondering how the
Yes, Bob, the fan will accelerate during an RTTY contest (or during long
transmissions in CW/SSB for that matter...) - this is normal.
If you set fan speed to 1 or 2 to start with (instead of NOR), you will
notice temperature rise will be substantially reduced - and much slower.
Good thing for the
I should make two points that may not have been apparent from my sarcasm in
the subject line.
1. Zip cord is a last resort, not a first.
2. You still have to match the stuff and Z0 is a moving target. Matching can
mean baluns on one or both ends.
Was KPA500 RF output wiring:
Gary there are seve
Ed,
I beg to differ on one point
>> So SMT did not take it from hams -
>> the hams took HB out of hamradio.
In my opinion, what took the 'HB' out of Ham radio was the decline in descrete
parts that you could see and handle.
I think that the electronics industries ubiquitous use of SMTs, LSI's
Dave,
You may not be able to buy much at the local Radio Shack, and there may not be
any other local source for the components, but that doesn't mean that you and I
cannot buy the parts needed to home-brew ham radio gear; even the PC Boards can
be designed by a ham that's willing to take the t
> I think the electronics industry's ubiquitous use of SMTs, LSI's,
> GPA's etc. caused the decline in demand in manufacturing of the more
> expensive and labor intensive items like tubes, variable caps,
> resistors. etc.
The demand for leaded parts may be lower, but don't count them out. We
Dave,
Most parts to do "leaded component" HB are easily available, just look
at Mouser or Digikey, or Newark or Allied, or many other major
distributors. It is rare not to find what is needed. If you are
working from an older parts list, you may encounter some difficulty in
that the stated p
Thanks guys.
I've made open wire/ladder line before and will be doing so again for a
planned vee-beam array, but I've never tried twisted pair other than UTP for
Ethernet (most people call it "Unshielded Twisted Pair" but I guess
"Unified" or "Uniform" would make sense too).
Years ago I used co
Good advice. I run my KPA500 with all the lights lit in all modes,
including very aggressive RTTY contesting As noted, the fan speeds up
with constant CQing, but never approaches maximum speed. I also run it
this way for various WSJT modes, with the same performance. The
wattmeter, which I h
I would like to "second:" Don's comments about HB. Believe me, when I
say I come from the "old school" WRT HB, but just trying a single
"Manhatten [sic] construction" using chads punched from .065" circuit
board with a "nibbler" and mounted with superglue on a ground plane was
more than enough
I bought a "gazillion" 10 megohm 1/4 watt resistors on sale once. They make
wonderful "standoff insulators" soldered to a bit of copper PC board to
support circuit elements. I find that it's very easy to "breadboard" a
circuit that way.
Ron AC7AC
-Original Message-
From: elecraft-boun...
A quick warning about actually using zip cord for feedline. The typical
insulation material is NOT designed for RF transmission, usually for
flexibility, color, durability taking the abuse that AC cords always take,
etc. It is almost always some PVC based formulation. Zip cord has been
famously
We had a small net today with generally decent signal levels. Contest QRM
was a bit of a problem at times. There was a little discussion about K3 AM
filter bandwidths. The question was referred to the reflector. We had 14
participants over a 15 minute period. Have a great week.
Here is the li
Hi Bill,
I am interested. Send pictures. How much are you asking?
73
Roy N5SWE
( I am on 75 meters every night, 3.970 Mgz at 04:00 - 05:00 Z )
_Judge31@aol.com_ (mailto:judg...@aol.com)
(775)741 9352
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No.
The proper number of rigs is just one more.
73 de W6BK
On Sep 7, 2011, at 7:13 AM, Peter Wollan wrote:
> It is possible to have enough rigs.
>
> http://forums.qrz.com/showthread.php?311312-Washington-Island-s-Ham-Radio-Treasure
>
> Peter W0LLN
> ___
I have my Elecrafts K1 & K2/100, Ten-Tecs Jupiter & Argo V, a Patcomm
PC-500... & my XYL thinks I'm nuts. We can eventually get a K3/100 in there
too... Right?
73 de Bert
WA2SI (3rd gen. law enforcement officer with prayer for all those who lost
their lives, loved ones, and all who were affecte
Holy Mackerel,
Looks like NASA can have an alternate mission control at W9EVT's QSL.
Thanks for the post!
John Westmoreland
AJ6BC
On Wed, Sep 7, 2011 at 7:13 AM, Peter Wollan wrote:
> It is possible to have enough rigs.
>
>
> http://forums.qrz.com/showthread.php?311312-Washington-Island-s-Ham-
Hi all,
I sometimes listen outside the ham bands to some broadcast station.
Let's say on 13.500Mhz and then go to another ham band and then want to came
back to the 20m band.Using the up/down controls it will come up with
13.500Mhz (the frequency used last on this band)so I have to tune all the
w
Karl,
No, but Direct Frequency Entry will put you on any frequency you want.
73,
Don W3FPR
On 9/11/2011 8:24 PM, Karl Ahamer wrote:
> Hi all,
>
> I sometimes listen outside the ham bands to some broadcast station.
>
> Let's say on 13.500Mhz and then go to another ham band and then want to came
>
You might set up a frequency memory for somewhere in each of the ham bands
and recall that memory. Some people assign a "quick" memory to each band.
Dick, K6KR
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Karl Ahamer
Se
I use the quick memories, M1 - M2, and have a CW and SSB start frequency
as recommended in the "Owner's Manual" on page 16
John
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New P3 Jockey here. It seems to work fine. I note however that when I
have a CW signal zeroed on CWT [and with AUTO SPOT], it shows up just
below the center line that has the correct frequency displayed on the
K3. I think I need to download a new manual, the one that came with it
is apparent
With the recent talk of Heathkit I thought some might enjoy seeing an
old Heathkit ad. I just scanned it in from QST June 1957:
http://udel.edu/~mm/ham/heathkitAd.png
73,
Mike ab3ap
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On 9/11/2011 6:39 PM, Dwayne Rohmer wrote:
> Fred,
>
> Try Menu: Ref Cal. Did just that this morning. Works like a charm.
Thanks Dwayne, Worked great! I also found it in the manual ... just
have to look harder.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2011 Cal QSO Party 1-
On 9/11/2011 6:48 PM, Mike Markowski wrote:
> With the recent talk of Heathkit I thought some might enjoy seeing an
> old Heathkit ad. I just scanned it in from QST June 1957:
>
> http://udel.edu/~mm/ham/heathkitAd.png
Hmmm ... looks like a DX-100 paired with a 75A4? I could afford Heath
wi
There is a REF CAL function on the P3 menu. Adjust it so the K3 and P3 agree.
On 9/11/2011 6:02 PM, Fred Jensen wrote:
> New P3 Jockey here. It seems to work fine. I note however that when I
> have a CW signal zeroed on CWT [and with AUTO SPOT], it shows up just
> below the center line that has
Hi Fred,
Yes, at narrow spans there may be a small frequency error depending on
the accuracy of the clock oscillator in the P3. The calibration
procedure is in the "Calibration Procedures" section of the P3 Owner's
Manual. You don't need a frequency counter or signal generator - you
can calibrat
Ah, but a rig is known by the company it keeps!
Good marketing. A Collins owner who chooses the DX100 (and the DX100 was
lighter than the Collins transmitters I lifted - IIRC the 32V series weighed
over 100 lbs.)
Tnx Mike!
Ron AC7AC
-Original Message-
On 9/11/2011 6:48 PM, Mike Mar
The DX-100 weighed enough to give my Dad (K3QDC, SK) his first slipped disk!
He brought it home on approval but decided not to keep it. I don't recall
whether the return was before or after the surgery.
/Rick
On Sun, Sep 11, 2011 at 7:39 PM, Ron D'Eau Claire wrote:
> Ah, but a rig is known by t
You made me go look ;-)
The 32V2 is 110 lbs. I got one from a friend's estate and got rid of it
because of the weight alone.
The Heath DX100 is 100 lbs, so I can understand a slipped disc!
My Viking Ranger weighed 45 lbs. I thought that was plenty for one small box
- even when I was a kid!
They
Mark,
Wow - Heath Time Payment Plan on orders totaling $90.00 or more - maybe
they'll bring that back too!
73's,
John W.
AJ6BC
On Sun, Sep 11, 2011 at 6:48 PM, Mike Markowski wrote:
> With the recent talk of Heathkit I thought some might enjoy seeing an
> old Heathkit ad. I just scanned it in
Elecraft CW Net Report for September 11th & 12, 2011
Good Evening,
The nets went very well today. Although twenty was not as long as
normal forty meters more than made up for it. I just noticed the number
of check ins on each is pretty balanced. After counting I find it is
exactly bal
Good to see you using the right name for them, David. These days
ex-CBers, or those influenced by CB, tend to call rigs and transceivers
"radios". To me a radio is something on which one listens to broadcast
stations.
You are quite obviously a traditional ham - good on you.
73 de David G4DMP
I
On 9/11/2011 5:20 AM, Bill W4ZV wrote:
> There is a loss graph on page 2 below but I believe ET3PMW's losses were
> much higher. Of course this could have been due to poor quality wire
> available in Ethiopia.
At HF, loss is essentially due to the resistance of the conductors, plus
whatever loss
Be cool! Stop smoking!.
http://www.kpnmusicchiangmai.com/clickfriend.php?jqID=93a4
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> The 32V2 is 110 lbs. I got one from a friend's estate and got rid of
> it because of the weight alone.
>
> The Heath DX100 is 100 lbs, so I can understand a slipped disc!
>
> My Viking Ranger weighed 45 lbs.
Hurts my back just to think about it, Ron. The good news:
K3, 9 lbs.
KX3, 1.5 lbs :)
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