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Author Topic: 2 meter adjustable power output  (Read 3958 times)
WA1ESO
Member

Posts: 1




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« on: October 01, 2013, 05:58:38 AM »

I am looking for a simple 2M transmiter or amplifier that alows for continuous adjustable output 1 to 10W.

Are there any modules or kits around that provide this kind of operation? Simple RF signal for test purposes is all I need.

Perhaps someone here as something in their workshop that they would like to sell.

Please contact me directly.

WA1ESO(at)JUNO(DOT)COM

WA1ESO@JUNO.COM

TNX & 73

JOHN
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W7AIT
Member

Posts: 491




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« Reply #1 on: October 01, 2013, 11:40:33 AM »

Kenwood TS-2000 is continuously power adjustable from 100 watts down to 5 watts on 2 meters.
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WB6BYU
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Posts: 13486




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« Reply #2 on: October 05, 2013, 06:02:19 PM »

Probably the simplest solution would be a low power source, perhaps an HT, feeding
a power amp with a variable attenuator between them.  A pair of PIN diodes with
a DC bias provided through a pot should provide sufficient power control, and by
putting it before the amp you don't have to do the attenuation at high power.

Otherwise, check the schematic for most 2m FM rigs that have selectable output
power levels and you usually find a DC control internal to the rig.  I did this
with an old Wilson HT:  the low power switch just added a resistor in series
with the power lead to the driver stage, so I replaced it with a screwdriver
adjust pot to allow anywhere from 4W down to a few mW.  If you need more
power, add a small amp after that.
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