With walky talky power typically around 5 watts this can be done with 4
cavities instead of the 6 or 7 needed for higher power, for the 600kc
ham vhf band split this each of these could be made from 3 3lb coffee
cans soldered together with 1/4 wave folded dipole antenas inside, save
one end and slide it in and out to tune for your frequency, use another
end to keep the insects from getting inside - if you measure from the
protruding element of one can to the next the connecting cable has to be
an electrical 1/4 wave - the coax velocity factor will be used in the
math equation to build this, 2 cans will be used for each rx and tx this
allows one side to operate without affecting the other, if you can get
this to work well you may be able to use just one antenna but you will
probably have to use 2 until you tune each side independantly.
Does anyone have a photograph or a diagram of this "coffee can duplexer"?
Bob Carter
Operations/Engineering--Max Media Radio Group/NC Division
WGAI-NewsRadio 560 AM Stereo .., WCXL 104.1 Beach 104..., WQDK 99.3
Q-Country..., WWOC 94.5 WaterCountry 94.5
---------------------------------------------------------------------------------------------------------------
Mid-Atlantic Engineering Services--providing radio stations with engineering
services in the middle eastern Atlantic area.
e-mail:[EMAIL PROTECTED],[EMAIL PROTECTED]
------------------------KC4QLP Amateur Radio------------------------------------------
Skywarn monitor-AKQ-Wakefield Va
www.qsl.net/kc4qlp
Echolink node # 56703 -- 145.250 VHF,440.850 UHF (PL 131.8)
_______________________________________________________
* List owner:
Group name: Echolink-Open-List
Group home page: http://groups.yahoo.com/group/Echolink-Open-List
Group email address: [EMAIL PROTECTED]
Yahoo! Groups Links
- To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
- To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
- Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
