[VHFcontesting] Bias Current for Gemini 70-1K Amp

[K3SK at buckwalter.co]

Fixed.    Defective clam-on ammeter.

 

 

K3SK

 

From: Fred Stefanik <n1dpmfred at gmail.com> 
Sent: Sunday, June 29, 2025 1:01 PM
To: K3SK at buckwalter.co
Cc: Moon-Net at groups.io; VHF Contesting <vhfcontesting at contesting.com>
Subject: Re: [VHFcontesting] Bias Current for Gemini 70-1K Amp

 

What else is powered in the RF deck without PTT enabled?  If this is ONLY the pallet current it should draw nothing until PTT is enabled.

1 Amp with PTT no RF is correct.  

I suspect you're measuring something else too.

73

Fred

K1FMS 

 

On Sun, Jun 29, 2025, 10:46 AM David R Buckwalter via VHFcontesting <vhfcontesting at contesting.com <mailto:vhfcontesting at contesting.com> > wrote:

 



What should I see for device DC current on the Gemini 70-1K amplifier?    I
replaced the Ampleon ART1K6FH device due to failure.    With the new device
installed the DC supply to the RF deck draws 1 amp powered on at idle.  When
PTT is engaged the current rises to 2 amps.   In an earlier conversation
with Roger at the DX Shop implied 1 amp Idq was what I should see.  The 2
amp reading seems high to me, but with no technical documentation on this
amp, I have nothing to base it on.  There is an adjustment on the RF deck
that is most likely for setting Idq.   Should I set this back to 1 amp with
PTT and no RF drive?





K3SK  

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