I recently received a recent e-mail pertaining to the current draw of the
Omni VII. Thought I'd share the exchange as others might have the same
question.
<snip>
Hello Bob!
Always enjoy the technical discussions on the various TenTec grouPS and
am amazed at the patience and diplomacy you demonstrate during what
otherwise could be difficult exchanges.
I know we have discussed the OMNI VII current vs. power out on the
various bands. I admit that I have lost those e-mail exchanges and wonder if
you have a matrix of power / current drawn by band that you could send my
way. I seem to have rather high current, with reasonable SWR and would like
to run a similar matrix on my 07.
<snip>
My response and findings:
This morning I did a quick run through the bands and noted the amp meter on
the power supply.
160M - 16.5A
80M - 19.2A
60M - 19.5A
40M - 17.5A
30M - 18.0A
20M - 19.2A
17M - 20.5A
15M - 16.7A
12M - 20.8A
10M - 17.8A
6M - 19.8A
These measurements were made as my station is configured, thus the output of
the Omni VII goes through a 2 position coax switch. From there through the
Centurion amp input. From the output of the Centurion {The power meter is
on the line between the Centurion amp and the tuner selector switch} to
another coax switch that selects one of 2 tuners. One of the 4 outputs of
the 238 tuner has an external 50 ohm load that was used for these
measurements. Hence, there are several switches, the path through the amp
although it was off, various cables and such. Noted that these do actually
contribute to a bit of loss in power. Power output on all bands was noted
to be ~90 watts +/- 5 watts. From this info I can see that the radio might
draw some ~22 amps on some bands and load configuration.
As I recall, the last time I did a RF transmit power alignment on the bench
the radio produced 100 to 105 watts on all bands. This was done with the
Bird 43P and a 50 ohm load and only short coax jumpers to connect the
required pieces of equipment.
Time for a commercial: - I have a Diawa CN-801 HP power meter that I have
found compares very favorably with my Bird 43P and a known accurate slug.
Actually I like the Diawa better than the Bird 43P for station use as the
Diawa has peak hold and a couple of other nice features not found on the
Bird meter.
Hope this helps.
73
Bob, K4TAX
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