[Antennas] Extending Feedlines

[Reginald Mackey]

could you direct me to a text on this subject that you state on the theory
of the losses  here in your statement in "every connector inserts loss into
the transmission line? Additionally, how to do you compute  those losses?

Thanks in advance,

Reggie

----- Original Message -----
From: "A10382" <a10382@snet.net>
To: "Nathan, Kevin" <KevNathan@DSB.WA.GOV>; <antennas@mailman.qth.net>
Sent: Sunday, April 21, 2002 3:40 PM
Subject: Re: [Antennas] Extending Feedlines


> Hmmm.. not start a debate?  how silly...
>
> Every connector inserts some loss into the transmission line.  You already
> have:
>
>             Transceiver             1
>             SWR meter             2
>             Tuner                        2
>             Antenna switch(?)    2
>             Antenna                    1
>                                             ----
>                                               8
>
> Just how many more do you want to add?  A barrel is two (2) more!  Will
the
> barrel be outside or in?  I'd vote for inside, even it means shortening
the
> existing line somewhat.
>
> The other potential problem is ending up with two SLIGHTLY different
lines -
> unless you buy EXACTLY what you already have - same manufacturer and same
> model# line.
>
> As connector do add some loss, are you DXing a lot of weak signals or able
> to do fine now?  The higher tower and better ground plane (and change in
> impedance and SWR from being farther from earth will probably more than
> offset  2 more connectors.
>
> <<---  END OF MESSAGE --->>
> ----- Original Message -----
> From: "Nathan, Kevin" <KevNathan@DSB.WA.GOV>
> To: <antennas@mailman.qth.net>
> Sent: Friday, April 19, 2002 12:27 PM
> Subject: [Antennas] Extending Feedlines
>
>
> > Hi All,
> >
> > It's been a few years since I've thought of doing this and I just don't
> > remember the specifics.  I am moving my vhf/uhf collinear from a rooftop
> > tripod to my tower.  Right now there is one single piece of RG8 feeding
> it.
> > However, this isn't long enough to reach the top of the tower.  At these
> > frequencies, approximately how much do you all think I would lose going
> > through a barrel to add coax, which I already have,  rather than
incurring
> > the expense of purchasing one long run of new stuff?  How about the same
> > thoughts for six meters?  I don't want to start a debate here but am
just
> > looking for some kind of consensus before I head to the radio store
> > tomorrow.  <GRIN>
> >
> > Thanks much and 73.
> > Kevin, K7RX
> >
> > Kevin Nathan, Independent Living Coordinator
> > Dept. of Services for the Blind
> > 3411 S. Alaska
> > Seattle, Wa 98118
> > Voice:  (206) 721-6450
> > Cell:  (206) 604-4767
> > Toll Free:  (800) 552-7103
> > Fax:  (206) 721-6403
> > Email:  kevnathan@dsb.wa.gov
> >
> > - - -
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