Stan: If you are running the HTX-100 on Low, you should have no problem with
the TX even with a major antenna fault. At 25 watts, you can have long-term
issues even with a perfect match.
On High power, a 50 CFM or bigger fan is advisable due to the PA running at
about 35% efficiency in Class AB. So, with 25 watts out, you need to dissipate
around 50 watts of heat. Running at 5 watts, the ckmbination of the PA resting
current and low efficiency will result in around 13 watts of heat to
dissapate. Even with this, a modest fan is a good idea. With my second beacln,
I used a 5" power supply fan.
Between 4 different QTH's, between 1979 and 2005 I ran a beacon on 28.287 MHz,
WB1DNM, KA1YE, KE2DI, KB2YTW & NQ2RP. Heat is your enemy. Keep the heat under
control and everything else takes care of itself...
73, Keith, WB2VUO, TC-ARRL WNY Section Amherst, NY
Sent from my Galaxy Tab® A
-------- Original message --------From: Stan Stockton <wa5rtg@xxxxxxxxx> Date:
9/17/17 19:19 (GMT-05:00) To: hfbeacons@xxxxxxxxxxxxx Subject: [HFbeacons]
Little help with setup
Toward the end of October I plan to set up a ten meter beacon at my QTH on
Cayman Brac and leave it running.
My question is:
What is the EASIEST way to protect the rig (HTX-100) if something goes wrong
with the antenna and the SWR goes high? Haven't tried to figure out what the
worst case SWR would be with a dummy load in parallel in the house and the coax
either open or shorted at the antenna. I'm not worried about power going into
a dummy load. The antenna will be a quarter wave vertical within ten feet of
the salt water and it will be plenty loud. Would rather activate a coax relay
and send all the power to the dummy load if the SWR went high but not sure what
the least expensive solution is to do that?
Thanks... Stan, K5GO
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