[ARC5] SCR274 field test

[Brian]

Hello J,

You are looking at only the steady-state current. Elsewhere in the manual 
you will find the start-up current listed. You need to allow for 120 A 
start-up on the transmit dynamotor.

73 de Brian, VK2GCE.

On Sunday, July 19, 2015 10:28 AM , you said:

I was hoping that I could run the dual rx/tx setup off of my  jeep battery, 
but it seems it needs a stiffer deep cycle type to keep up with the load in 
transmit. The jeep batter sagged badly and for that matter so did the deep 
cycle battery (11v under full load), but it was sufficient to keep things 
working.
I think i'm missing something about the nature of dynamotors and batteries 
...
With the two transmitter filaments ( 4X 1625) @ 2a and the rx pulling about 
2.5a, that's a constant 4.5a, add the dyno in stanby which bring the the 
total cw break-in receive mode 7.5a.
The dyno says 9a @ 12V continuous duty for 440v @ 200 ma .That should be a 
max of 16.5a a key down. So how can 16.5 amps draw a 130AH battery down to 
11v from it's fully charged resting voltage of 12.6v ? ( it recovers on key 
up)
When I was using a SMPS, it sounded good, now I've got some chirp due to 
power droop.What say you experts?
BTW, I was doing this in "original spec" using a very short wire antenna of 
about 35 feet on 80 meters in NVIS config. Loads right up at about 50% 
inductance with coupling also about 50%. I like to stick a NE-2 ( leads 
shorted together) in the antenna clip on the bc-442 to see how bright I can 
make it glow. It tracks well with antenna current.