Actually I have done that...picked a quiet portion of several bands and ran
several minutes of "testing" messages at 100 watts out. The Murch components
were all cool to the touch and the Vectronics has barely discernable
warming. Thing is, I could never find out where the 20 watts loss was being
dissapated on 160.
Too bad no one is making the old link coupled transmatches anymore...I have
a Johnson Matchbox..the 250 watt version...that I use for a basis of
efficiency testing.
Nothing I have ever homebrewed or anything commercialy available nowadays I
have tried can really match the balance or efficiency ability of the old
Matchbox, as far as matching to either one of my delta loops fed with 450
ohm ladder line.
----- Original Message -----
From: "Gary Hoffman" <ghoffman@spacetech.com>
To: <tentec@contesting.com>
Sent: Monday, June 30, 2003 6:39 PM
Subject: Re: [TenTec] T tuner (transmatch) losses?
> That is an interesting comparison.
>
> Now, I wonder what would happen if you repeated that test with an actual
> antenna in the place of the dummy load. That might represent a worst case
> load. Of course, try not to qrm anyone in the process ! :)
>
> 73 de Gary, AA2IZ
>
>
> ----- Original Message -----
> From: "denton" <denton@oregontrail.net>
> To: <tentec@contesting.com>
> Sent: Monday, June 30, 2003 8:01 PM
> Subject: [TenTec] T tuner (transmatch) losses?
>
>
> > Hi all...anyone running a Murch UT-2000B? Have been following the TT
users
> > group and I compared the Murch to a Vectronics 1500....according to my
> > wattmeter connected to a 50 ohm dummy load, I get at most 4 watts loss
out
> > of the Murch compared to the Vectronics....which indicated 20 watts loss
> on
> > 160!
> > ----- Original Message -----
> > From: "tongaloa" <tongaloa@alltel.net>
> > To: <tentec@contesting.com>
> > Sent: Monday, June 30, 2003 7:02 AM
> > Subject: [TenTec] 2A GA Omni A, Omni D at w4rrw
> >
> >
> > > Stayed til about 2AM, too old for all night. OmniA 20/80 OmniD 40/15
> > > probably should have swapped though as no filters in D made it a bit
> > > of a chore copying on crowded 40m CW. I can't imagine anyone
> > > working FD without QSK. Swapped out homebrew KW T net
> > > tuner for the MFJ on 40 and man what a difference. Must have been
losing
> > > half
> > > the output power heating up the MFJ innards.
> > >
> > > -bob
> > > ah7i/w4 op at w4rrw
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> > >
> > >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
|