Gary, I use a THP 1.5KFx with a F3K and went thru my share of
teething troubles. It turned out that my mic (from a nice Yamaha
headset) was overdriving the F3K, I reduced my mic gain to 0 and
adding an attenuating resistor in series with the mic.
I have never fiddled with the ALC settings, I may do that....
My biggest problem is when my antenna fails to tune well (which it
does sometimes on some bands), then the 1.5 SWR gets me the red
light. If I can keep the SWR to 1.2 (which I often can) then I am
generally good to go.
At 09:07 AM 9/21/2009, Gary Robertson wrote:
My ham shack consists of a Flex-3000, a Tokyo Hy-Power HL-1.2Kfx
Amplifier, Palstar AT-Auto tuner, G5RV dipole, Heil Pro-Set "IC"
Headset (using recommended cabling), and a Dell PC running XP. I am
using PowerSDR 1.18.2.
The vast majority of the time, everything works great, including my
use of the Tokyo Hy-Power amplifier. However, every once in awhile,
I trip the overdrive protection circuit on the amplifier, causing it
to go into standby mode. This overdrive tripping situation seems to
happen most frequently when I unintentionally raise my voice during
transmit to "emphasize" something to someone who is having
difficulty hearing me. While I appreciate the amp's overdrive
protection, I don't think that tripping it, even occasionally, is a
good practice.
When using the Tokyo amplifier, I reduce my drive setting to about
20 (depending on the band) and reduce my Mic Gain to 5. Based on
past comments on the Flex reflector, I have changed the ALC setting
under the DSP tab to 1 for Attack, 15 for Decay, and 500 for Hang.
All of these changes give me about 450 to 500 watts out on the
Amplifier. When viewing the ALC reading on transmit, it seldom
exceeds 0. STILL, I am occasionally tripping the Tokyo Hy-Power
Amplifier's overdrive protection circuits.
Any suggestions?? Has anyone using a Tokyo Hy-Power amplifier had
success with other drive, Mic Gain, or ALC settings? Should I change
some other settings on my Flex-3000? Thanks beforehand for your help
and suggestions!
Gary Robertson - N5UTM
groberts...@austin.rr.com
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