[Elecraft] KAT100 and external watt meter question

Fri Jan 31 19:31:00 2003

Thanks a lot for the advice. TLDetails is a great little prog.

73, Bole

> -----Original Message-----
> From: George, W5YR [mailto:[email protected]]
> Sent: Saturday, February 01, 2003 12:47 AM
> To: Bozidar Benc; Stuart Rohre; elecraft
> Subject: Re: [Elecraft] KAT100 and external watt meter question
> 
> 
> With TLDetails, I found a combination of R and X for the load that
> produced a 10.3 dB loss in the RG-213 coax for a length of 100 feet on
> 20 meters, and produced an SWR of about 11:1. I didn't have to
> calculate it - took the easy way out!   <:}
> 
> IF you want to do it manually, get a Smith chart and start fishing for
> values of load that result in the SWR that will give 10.2 dB loss in
> 100 ft of RG-213 on 20 meters. The loss data comes from the tables in
> the Handbook as Stuart suggested. But recall that there is a
> semi-infinite set of combinations of R and X that will fit on that SWR
> circle on the chart.
> 
> Hope this answers your questions. BTW, there are many good
> transmission line analysis programs available these days. I just
> happen to prefer TLDetails . . .
> 
> 73/72, George
> Amateur Radio W5YR -  the Yellow Rose of Texas
> In the 57th year and it just keeps getting better!
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> K2 #489  IC-765 #2349 IC-756 PRO  #2121 IC-756 PRO2 #3235
> 
> ----- Original Message -----
> From: "Bozidar Benc" <[email protected]>
> To: "Stuart Rohre" <[email protected]>; "elecraft"
> <[email protected]>
> Sent: Friday, January 31, 2003 5:32 PM
> Subject: RE: [Elecraft] KAT100 and external watt meter question
> 
> 
> > Yes, coax losses are easy to find
> > (http://www.radiobooks.com/products/techinfo/coaxloss.htm for
> example), but
> > I guess that they are for the case when SWR is 1:1.
> >
> > What I would like to know is how George calculated the 10.3 dB loss
> in his
> > example.
> >
> > Bole
> >
> >
> > > -----Original Message-----
> > > From: [email protected]
> > > [mailto:[email protected]]On Behalf Of Stuart Rohre
> > > Sent: Saturday, February 01, 2003 12:05 AM
> > > To: Bozidar Benc; elecraft
> > > Subject: Re: [Elecraft] KAT100 and external watt meter question
> > >
> > >
> > > There is a loss table in ARRL Handbook for typical coax losses
> > > under various
> > > SWR conditions.  Also in many Antenna books.  Actually a good
> > > question, and
> > > there are likely such charts on the web.   Google.com search
> keywords:
> > > "Coax SWR losses" or similar combinations.
> > > 72,
> > > Stuart K5KVH
> 
> 
> 