Good Morning "Richards":
With my learner's permit in hand, I wonder how you
tested output - CW... SSB ... or some more exotic
measure?
I am way past a "learner's permit"........BSEE with extensive RF
experience......heh heh I tested it in both CW and SSB modes using keydown CW,
pulsed CW and audio pulsation............the results were da' same..
Also what is the error tolerance (+/-) of the meter, I
have read some have as much as 10% variance +/-
and if so, it could be that you are getting 95 watts out
and reading only 85 ?
Good idea cept' I have multiple (3) Bird 43 wattmeters with 3 separate
sensors............all read the same +/- 1 watt and have I further verified the
RF power with an oscilloscope that has in place a current calibration sticker.
Also, when you tested, what was the load - antenna, or
dummy load, or can/do you test at a point earlier in
the system? I am taking it that the "lab grade" 50 ohm
load is a high quality dummy load (i.e., a known quantity)
As my initial E-mail stated in part: "Yet, when the RF output power is measured
with a lab-grade 50-ohm load ..........."............I actually checked with
two different lab-grade loads, not antennas!
..
Regards,
Val / W5PUT
--- On Thu, 12/10/09, Richards <jruing@ameritech.net> wrote:
From: Richards <jruing@ameritech.net>
Subject: Re: [TenTec] Omni VII Query
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Date: Thursday, December 10, 2009, 7:48 AM
With my learner's permit in hand, I wonder how you
tested output - CW... SSB ... or some more exotic
measure?
Also what is the error tolerance (+/-) of the meter, I
have read some have as much as 10% variance +/-
and if so, it could be that you are getting 95 watts out
and reading only 85 ?
Also, when you tested, what was the load - antenna, or
dummy load, or can/do you test at a point earlier in
the system? I am taking it that the "lab grade" 50 ohm
load is a high quality dummy load (i.e., a known quantity).
I am not being critical... just looking to learn and apply
a limited knowledge at this point.
Thanks.
============= JHR ==================
Val Erwin wrote:
> Omni VII-ites'
>
> I have an Omni VII that is appx. 2 years old. Over time, I have noticed a
> gradual decrease in RF output power.
>
> With 13.8 VDC measured at the radio power connector, the Omni VII digi-panel
> states: "Power 100W". Yet, when the RF output power is measured with a
> lab-grade 50-ohm load and either a Bird 43 or a calibrated oscilloscope, the
> measured RF power is actually on the order of 85 watts output, regardless of
> band.
>
> I suspect I have an aging component sitcheeashun'..........Is there an
> internal control to crank the RF back up to spec??
>
> TNX in advance for any feedback.........
>
> Val / W5PUT
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> TenTec@contesting.com
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>
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