Paul,
It looks like you are ignoring the fact that your power supply is less
than 100% efficient.
Power into the supply does not equal power out of it.
The readings from your Astron current meter are more realistic for the
DC Current requirement.
73,
Don W3FPR
On 3/5/2014 3:16 PM, Paul Grigorieff wrote:
OK, here are some new readings, taken with a Kill-A-Watt power consumption
meter. The readings in transmit mode were taken by keying down in CW for a
few seconds and waiting until the meter reading stabilized.
I have an Astron 70A power supply powering a Rigrunner that then supplies a
K3, a KAT500, and a PigKnob. The P3 is plugged into the K3. There is a
set of speakers, which draw .06A AC as well.
K3 in RCV mode .92A AC, or 84W 6 DC at 14v
K3 in XMIT, 15W out 2.7A AC, or 240W 17A DC "
K3 in XMIT, 50W out 3.7A AC, or 342W 24A DC "
K3 in XMIT, 100W out 4.7A AC, or 438W 31A DC "
How do these look to everyone? I'd like to get them close to right so that
I can calculate my battery needs for emergency operation.
Something else I don't understand is the ammeter on the front of the
Astron. When the K3 is turned on, the Astron's meter jumps up about 1A
DC. When the K3 is transmitting at 15W, the Astron's meter reads about 7A
DC. At 50W transmitted power, it reads 11A DC. And at 100W out, it reads
15A DC. Quite a difference from the measured and computed DC amps listed
above. What is going on here? Simply an innaccurate Astron meter?
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
