[ARC5] Smart People: Multi-Set Current Corn-fusion

[Mike Feher]

Dave -

 

When you have just one set on, did you include the off current of the other
sets. How were the measurements made? 73 - Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of David Stinson
Sent: Sunday, December 3, 2017 9:09 AM
To: ARC-5 <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net
Subject: [ARC5] Smart People: Multi-Set Current Corn-fusion

 

Dear People Smarter Than Me:

 

I'm confused.  Bumped-up the RAX "burn-in" to 100V

B+, which is provided to all three receivers from

the same buss, using a current-limited supply so if any of the old parts
decides to "shuffle off this mortal coil," the supply will shut that down.

Did some current measurements with all sets in the same operating mode:

 

All sets connected and off:  13 mA, within 1 mA of expected.

LF set playing alone: 30 mA (has fewer stages than the others).

LoHF set playing alone: 41 mA.

HiHF set playing alone: 46 mA (about 10% "hot,"

will check).

but:

All three playing normally at once: 83 mA.

 

Ummm... shouldn't that be like 117 mA?

 

Anybody got an idea?

 

73 OM DE Dave AB5S

 

 

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