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ts 130 as qrp rig
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Reply
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by KD5SBO on August 3, 2009
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I know a ts130 is not technically a qrp rig, but is there a way to decrease output to 5 watts or less? Thanks in advance for any suggestion.
73's
KD5SBO
TERRY
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RE: ts 130 as qrp rig
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Reply
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by KU3X on September 12, 2009
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I had a TS 130 many years ago but if I remember correctly, for CW just turn the Carrier level control
down. That will get you to very low power.
As for SSB, you have to turn your mic gain back. I'd turn on your audio processor when doing that. If you
have the use of a PEP watt meter it will be very helpful. If not, the way you can really check to see if you are at the power level you want to get to is to borrow a Kenwood SM 220 monitor scope and a good watt meter.
Watch the deflection on the scope as you key the rig in CW as you watch the wattmeter. Once you turn your power level down to, let's say 5 watts, look closely at the monitor scope. Look where the signal peeks and remember it. Now put your rig in the SSB mode and talk until your scope shows the same peeks.
This is not a QRP user friendly rig for portable operations. But it is do able.
When you bias the 100 watt finals down to only 5 watts output power they still eat up a lot of current. You'll probably still draw around 7 to 8 amps of current with only 5 watts output power. If you are doing this while plugged into power supply at home, who cares if it draws that much current? But it sure does shorten the charge cycle of a battery. That is one of the reasons it is always better to get a rig designed for low power operations.
The Yaesu FT 817 and the Icom IC 703 rigs draw about 400 ma on receive and about 1.9 amps transmitting at 5 watts out.
Good luck,
Barry, KU3X
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