Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Rich,
The radio is a 300 watt INPUT radio. At the best linear efficiency you
could expect ~60% output on the radio, or 180 watts peak. I know there
are those who say they get way more then that reading, but they are either
running into an uncalibrated meter, or are putting more the 300 watts into
to the rig. And I can see the hate mail coming on this :-)
I would do the following: 1) you know you have an improper mic impedence,
get that fixed. 2) see how many watts are coming out in CW mode.
#2 will get you and idea how good your RF chain is in the TX. I would
expect about 150 watts OUTPUT on CW. That should be easy to measure, but
don't leave the rig in CW mode "key down" too long. The sweep tube finals
are not made for "key down" duty. Seems to me that the TR3 did not need a
key in the jack to be "key down" aka the key jack is closed by default.
Was easy way to tune the rig as I recall.
#1 will get good audio into the radio. Then see what your peak reading
watt meter says. BTW, do both the CW and the SSB on peak reading mode of
the meter. Peak reading modes are basically a "hang" amplifier. Charge
a cap and use its voltage to driver the meter via a set of internal amps.
The peak on CW, is *basically* what you would expect to see on peak of
SSB if your meter is working correctly. Also, for CW on peak, you should
see you meter go up quickly on keying the rig, and then slowly go back to
0 when you let off the CW carrier. If it does not, then your peak meter
is not working as I would expect it to.
73,
Ron WD8SBB
On Sun, 20 Jan 2008, Rich Carter wrote:
"Rich Carter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Ron
I'm using a Daiwa HF wattmeter on the peak setting. While I realize the
meter should show a low reading, I would expect that a I should need to
reduce the RF gain from max to prevent overdriving the rig. Since the rig
lacks speech compression, I don't know what I should measure, but I would
expect a 300W rig to drive at least 10W or or more. What do others see on
their meters?
It seems to me that the collins mic I have is not matched properly. I have
my hands full alignment issues. It may be best for me to replace the mic
with something that is known to work with this rig.
Rich - KE1EV
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