Dave,
What does the asterisk after the heat sink temperatures represent?
73..de John/K4WJ
At 03:57 PM 12/11/02 -0500, Dave Bowker wrote:
>Here is some data that may shed light on the discussion dealing with 962 PS
>heatsink tempeature. These tests were performed on an OMNI-VI Option 3 and
>961 power supply today.
>
>73, Dave, K1FK
>Fort Kent, ME
>~~~~~~~~~~~
>
>NOTE: The VI Option 3 has the Ovenaire MC43-1G crystal oven master
>oscillator which is NOT powered up during times that the 961 PS is ON and
>the VI is OFF (Early production OMNI VI+ radios before the TCXO was
>incorporated maintained power to the oven when the VI+ POWER switch was in
>the OFF state).
>
>Temperature and AC current data taken with B&K Precision Model 390 DVM with
>Type K thermocouple probe attached to 961 heat sink at top of fin adjacent
>to Q1. The VI was in the transmit mode for 10 minutes at 100 watts output
>into a dummy load, at which time the temperature stabilized at the reading
>indicated. Output power was monitored with a Bird 43 wattmeter, 250 watt
>3-30 MHz slug and with 0% reflected power from a Bird #8141 dummy load.
>Relative humidity for all meaasurements was 35%.
>
>Test Parameter 961 Input (amps) 961 HS Temp
>
>961 OFF (ambient) 0.00 16.0* C
>
>961 ON/VI OFF 0.30 20.0* C
>
>961 ON/VI Recv 0.62 27.0* C
>
>961 ON/VI Xmit 3.35 61.5* C
>
>
>
>
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73..de John/K4WJ
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John/K4WJ in Pembroke Pines, FL
QTH 26 00 51 N
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K8PXG from 18 Jun 59 to 11 Feb 97
K8WJ from 12 Feb 97 to 07 Apr 97
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