The only reasonable way to get power output readings on different bands is
to make all measurements using your dummy load. Various SWR conditions can
throw the readings off quite a bit, even at perhaps 1.5:1 SWR.
73,
Lloyd Rasmussen, W3IUU, Kensington, Maryland
Home: http://lras.home.sprynet.com
Work: http://www.loc.gov/nls
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of tom behler
> Sent: Thursday, June 30, 2011 6:09 PM
> To: [log in to unmask]
> Subject: Wonder if these TS590 output power readings sound reasonable?
>
> Hi, all.
>
> Well, I have done some fairly extensive testing on the output power
> readings
> for my TS590, and I wonder if what I'm seeing is what can be reasonably
> expected.
>
> Let me start with some general background:
>
> First of all, I took the voltage reading from my Astron RS35 linear power
> supply, and it read about 13.8 volts--right where I had hoped it would be.
>
> Then, I took a bunch of SWR and output power readings, on various bands
> and
> frequencies, using my DXCC and Windom antennas.
>
> My best readings were found on 80 meters, where I could get my Alpha Delta
> DXCC antenna down to an SWR of 1.2 to 1. I can get reasonably low SWR's
> on
> other bands and frequencies with the DXCC or my Windom, but without an
> antenna analyzer, the 80-meter frequency with the DXCC was the lowest I
> could get. All readings were taken with the internal automatic antenna
> tuner off.
>
> With a 1.2 to 1 SWR reading on 80 meters, my LDG Tw1 gave me a forward
> power
> reading of 95 watts, and a reflected power reading of 1.2 watts.
>
> Just for kicks, I had my sighted XYL look at the watt meter on the TS590,
> and she said it was pegged at the maximum 100 watt level. My XYL also
> approximated my output power using the meter on my Tentech 238A manual
> tuner, and she said it looked to be just a hair below 100 watts.
>
> Interestingly, for reasons which I can't quite figure out, my output power
> reading was slightly lower when I used a dry dummy load. Specifically,
> the
> readings ranged from 90 to 93 watts with the dummy load connected after
> the
> TW1.
>
> Do these readings seem reasonable?
>
> Actually, I'm wondering if my TW1 is slightly off callibration.
>
> If so, does anyone know how or whether the TW1 can be callibrated?
>
> I'd be interested in any thoughts anyone has.
>
> 73 from Tom Behler: KB8TYJ
|