[ARC5] ARC-116 Curiosity

[Scott Johnson]

There is a forward/reflected power bridge that is causing the power to fold
back to protect the PA.  The original PA in the 116 was very glass jawed, it
was upgraded with a new PA module at some point, with a PA that used five
MRF321s in place of the early RCA devices.  The 321s are emitter ballasted,
and much tougher.  Amazing technology for the time, probably a little too
far reaching for an Army helo.  Now you need the ARC-115!

 

Scott V. Johnson W7SVJ

5111 E. Sharon Dr.

Scottsdale, AZ 85254-3636

H (602) 953-5779

C (480) 550-2358

 <mailto:scottjohnson1 at cox.net> scottjohnson1 at cox.net

 <mailto:scott.johnson at ieee.org> scott.johnson at ieee.org

 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf
Of Robert Eleazer
Sent: Friday, April 27, 2018 12:29 PM
To: arc5 at mailman.qth.net
Subject: [ARC5] ARC-116 Curiosity

 

I already mentioned that I got my ARC-114 30-70 MHZ FM transceiver up and
running.  Now I'm trying to get my similar ARC-116 20-400 MHZ AM on the air
as well.  I am using the same power supply, interface box and mike preamp
with an ATR-20 mike.

 

I have found that the ARC-116 receives Okay and if I transmit into a 50 ohm
dummy load through a  CW watt/SWR meter it works okay.  Power output shows
as about 4 watts, which probably is inaccurate and you can heard the
modulation both through the headset sidetone and over a nearby receiver. But
if I connect a cliplead as an antenna instead of the wattmeter the set more
or less refuses to transmit, as is seen both in the lack of current drain
and only a faint signal heard over the nearby receiver.


How do it know to do that?  Y'all have any ideas as to what is going on?

 

Thanks,


Wayne

WB5WSV     

 


 
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