One good reason I can think of is if you are running RTTY through your
standard 100 watt rig, you would want to limit power out to 30 watts or so.
Use an amplifier to get100 to 200 watts out on RTTY with out frying the rig.
If you don't use power you can't break the DX pileups from stations that can
run 1Kw.
I hope that answers your question.
Mike
-----Original Message-----
The maximum power output on 30 meters (10 MHz) is 200 watts in the US. I
don't think most folks know that. Why would you use an amplifier on 30
meters?
73
Jim W7RY
----- Original Message -----
From: K4elv@bellsouth,net
To: amps@contesting.com
Sent: Monday, April 07, 2008 9:50 AM
Subject: [Amps] Viewstar PT 1000a
Good day to the group. I am new to the group and was hoping that someone
out there may have an idea to help me with a problem I am having with this
PT 1000a.
I purchased this unit new at Dayton in 1983. I haven't used it very often
but never had any problems with it until recently. Previously I only used
it on the major bands 160 -10. With about 50 - 60 watts in I could get 400-
500 watts out depending upon the band. Now I have been getting active on
the WARC bands and this has been my problem. 30 meters was no problem, but
18 and 24 Mhz are another story. Besides having difficulty tuning up (very
critical final dip) I was getting some arcing at the band switch on both
bands, and no amplification on 18 mhz.. i.e., 50 watts in - 50 watts out!
Also, the arcing was more pronounced on 18 mhz.. I thought of VHF parasitics
and recalled I had a parasitic kit I had bought years ago from AG6K. I
installed the kit in both the anode and cathode of the 3-500. By the way I
have tried 2 different tubes. I have stopped the arcing on all bands but 18
(if I try to tune up on that band). Still no amplification on 18. I am
having proble
ms
with the resistors in the anode parasitic choke over heating on 24 and
28 mhz, so I still have some adjusting to do with the coil length on the
choke. I've followed the schematic and the unit appears to be wired
correctly for 18 mhz. SWR on the input doesn't appear to be a problem
except on 18, where it'll hit 3:1 with 50 watts of drive even tuning into a
dummy load. By the way, all efforts at tuning have been into a dummy load.
I have cleaned the carbon path on the band switch, but that doesn't effect
the arcing the next time Itry to tune up. The arcing is between the switch
contact closest to the wafer mounting screw.
Any thoughtswouldbe appreciated.
73 Mike K4ELV
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