The way I learned it was .5L = 468/f
where L is wavelength and f is the frequency in megahertz. Note
that this provides you with half the wavelength, not the full
wavelength.
Bill B.
P-19 #454, Dream Catcher
Nampa, ID
P.S. 144.39, for those of you that might be curious, is the
national APRS frequency.
Jim Nolan wrote:
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> West Wight Potter Website at URL
> http://www.lesbois.com/wwpotter/
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
>
> >From: Rye Gewalt <ryeg@vais.net>
> >To: charles@falk.net, Potter List <wwpotter@tscnet.com>
> >Subject: Re: Coax Connectors
> >Date: Fri, 10 Dec 1999 05:33:57 -0500
> >
> >Charles Falk wrote:
> >
> > > Would a couple of BNC or TNC connectors on RG58 pigtails be better than
> > > a PL259 on the cable from the mast connecting to an SO239 bulkhead
> > > connector on the cabin roof?
>
> The UHF connectors can handle alot more power than either BNC or TNC.
> UHF~2kW, BNC~10W TNC~25W. Also the UHF is less bothered by corrosion because
> of its large area. A UHF connector that can feed through the cabin roof is
> available from Pasternack Enterprises 949-261-1920, Irvine, CA. It is part
> #PE9114 UHF female to UHF female bulkhead mount. It costs $8.95 in single
> piece quantities. I would cover the outer portion with a rubber cap when it
> is not in use.
>
> Do not splice coax cable. You can get away with splices in short runs (less
> than 12" at 150 MHz) but on the boat the cable is 20-50 ft long. Any splice
> or impedance bump will seriously limit the match between the antenna and
> radio and could in some cases burn out the radios final amplifier. Use
> connectors to join cables.
>
> Also a better cable than RG58 and still the same size is RG142. It has half
> the loss but costs about 4 times as much. RG58 will have about 3 db loss per
> 100' at 150 MHz and RG142 will have about 1 dB. In a typical boat
> installation you will get about 60% more power to the antenna using RG142
> over RG58. RG58 is .40/ft in 100' qty, RG142 is $1.63/ft in 100' qty.
>
> Over and out,
>
> Jim Nolan P-19 #426 Panache
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