I have been running 100w output using AFSK A in the RTTY contest and I have
been monitoring my PA temp via the meter. I have my fan set for FN2 constantly
on, and the temp has only reached 45C.
Ken..G0ORH
CW4EVER
Sent from my iPhone
On 24 Sep 2010, at 17:47, Dave Hachadorian
I normally run 50W in CW or any digi mode, because I feel more comfortable
running well within the ratings, but I will always crank it up to 100W when
needed.
In a contest, you're listening half the time anyway, so 50% duty cycle and
the K3 will take it even at 100W output.
-
Julian, G4ILO.
Hi Ray,
Actual on the air results lead me to completely disagree with your
statement. With my old rig I ran at half power on RTTY. During contests if I
could not get a response from the other station by the second call I would
just twist the power knob to full and 90% of the time I would get the
I really thought that someone else would have picked up on this, but
since I haven't seen it yet, here goes.
One post indicated that moving from 50 to 100 watts was doesn't
matter but that going from 500 to 1kw, well, OK.
Hey, both are 3db and the relative change in power for either will be
Here is a copy of a posting I made on 20090312:
Here is a copy of a posting I made on 20090312:
I did an experiment on my two K3's - key down at 100 watts
for four minutes while noting PA Temp and fan speed. Both K3's
behaved
identically and both leveled off at PA Temp = 64C after
about 3
First I want to thank all who responded to my FSK question earlier
this week. The information was helpful and appreciated.
Now, one more. How much power can I safely use with FSK? I have made
several contacts so far at about 50 watts. Can I use more? there is a
RTTY contest this weekend, and I
The specifications for the transmitter in the Owner's Manual say 100% 10
min 100W key-down at 25 C ambient, so RTTY at 100 watts is within spec
even for extended transmissions, and an RTTY contest with its short
transmissions should be no problem at all at 100 watts.
You can monitor the
I've become a firm believer in air flow during rtty contests. I use a 24
volt 5 inch muffin fan
blowing air down into the K3 across the PA fins. I run the fan with about
12 volts which
cuts the noise down somewhat. Looking at the PA temp while doing this, it's
hard to get
it up much over 35C
The K3 has the best heat dissipation scheme I have ever seen in a 100W
transceiver. Though Wayne and co. don't want to hear about us doing it,
some of us have done the brick on key thing at 110 watts for a long time,
and watched the temp level out in the 50's. Fan comes on, goes to high, and
There seems to be some variation in this. I often run around 70W and
the temp usually tops out around 60 - 65C. It's gone as high as 72C
on a warm day.
73
--
Joe KB8AP
On Sep 23, 2010, at 1:03 PM, Guy Olinger K2AV wrote:
...
some of us have done the brick on key thing at 110 watts for
reason to do things.
73,
Mark
- Original Message -
From: Guy Olinger K2AV
To: Mark n2qt
Cc: elecraft@mailman.qth.net
Sent: Thursday, September 23, 2010 4:03 PM
Subject: Re: [Elecraft] FSK power
The K3 has the best heat dissipation scheme I have ever seen in a 100W
On Thu, 23 Sep 2010 14:28:41 -0700, Joe Planisky jp...@jeffnet.org
wrote:
The variation is probably due to a difference in ambient shack
temperature.
All of my ham radio equipment runs cool due to it's being in a
computer/server room with it's AC system set to 75F.
BT 73 ES GUD LUK
DE N5GE,
The difference in power between 50 watts and 100 watts is essentially
insignificant. If you can't work 'em at 50 watts with the antenna
you have... 100 watts ain't gonna make the difference. Period. 500
watts... 1KW.. OK.. maybe that'll help.
Just because the rig can take it... the
Well, you know what they say about opinions.
If you're jabbering away with some locals across town they might never know the
difference. But three dB can make a difference, especially on RTTY and in
contests.
Try telling a contester that the Kilobucks he just spent to stack another Yagi
on
No, I don't think that is normal variation. 72C is 162F. I think that is
too high and reflects something else. You would be well served to chase
that down.
Are your fans running at max at that temp? Do the fans blow out to the rear
or pull air in? What is your supply voltage showing on DISP
Hi folks- 3 db in my qrp world is HUGE.
On Sep 23, 2010, at 7:15 PM, Wes Stewart wrote:
Well, you know what they say about opinions.
If you're jabbering away with some locals across town they might
never know the difference. But three dB can make a difference,
especially on RTTY and in
If the RTTY demodulator is of the FM type, i.e., a limiter followed by
a discriminator (or, more likely these days, the software version of a
limiter and discriminator) 3 dB difference between two signals could
well cause the stronger signal to capture the limiter and suppress the
weaker
On 9/23/2010 4:37 PM, Ray Sills wrote:
The difference in power between 50 watts and 100 watts is essentially
insignificant.
Any contester or DXer will tell you from experience that this is NOT
TRUE. When you're 20 dB over the noise and QRM, 3dB doesn't matter, but
when you're on the edge of
On Sep 23, 2010, at 4:37 PM, Ray Sills wrote:
The difference in power between 50 watts and 100 watts is essentially
insignificant.
Whether 3 dB of power difference is important depends on band conditions.
Alex (Mr. CW Skimmer) VE3NEA has a nice set of measurements that he'd made a
few years
Do note that the 72C reading was on a day when it was probably around
32C (90F) in the shack. Normal summertime temps in the shack are
closer to 27C (80F). Otherwise:
Are your fans running at max at that temp?
Oh yes. They kick into leaf blower mode around 55C.
Do the fans blow out to
I run rtty at 75watts. No problems of course. Going to 100 is about 1.2 dbs.
Not worth worrying about I suspect.
John N1JM
--
View this message in context:
http://elecraft.365791.n2.nabble.com/FSK-power-tp5563724p5565605.html
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