Sal M. Onella wrote:
"Wet-n-Wild Bill" wrote in message
...

forgot to mention: the freq of theWeather Fax is the same as the SSB 2-25
MHZ

Bill


"Wet-n-Wild Bill" wrote in message
news
I have an ICOM M-802 SSB and a Furuno FAX-30 (Weather Fax Reciever)

onboard

my boat. The ICOM M-802 has a dedicated receive port for DSC Receive.

Can

I share the FAX-30 Antenna with the DSC receive port of the SSB? if so

what

coupler should i use? (The SSB Xmit/Rec antenna is 3meters away)

Bill




http://www.furuno.com/Furuno/Doc/0/A...FAX30%20Operat
or%27s%20manual%20d1%201.22.2003.pdf

They talk about a coupler in Section 7, but are not specific. As I dislike
t-connectors on principle, I would use a 50-ohm power divider. They
correspond to the action of a TV cable splitter but an actual TV cable
splitter would not perform well at HF and below You can build your own in a
metal project box, using a Y configuration with a 25-ohm carbon resistor in
each leg to maintain some semblance of impedance matching. Maybe you can
find an old TV cable splitter that you can gut for the purpose. For
receive-only, the antenna length is not critical. I recall Navtex specifies
a whip antenna of several meters; Navtex is on two freqs near 500 KHz, so
it's not far from the AM broadcast band. Hm-m-m ... What does a car radio
antenna look like???

Good luck.



Impedance matching shouldn't be an issue for the OP since he is using an
active antenna. A short whip at at 500 kHz presents a terrible mismatch
to a "50 ohm" receiver input so the active antenna matches impedance,
usually with an FET source follower, and may provide gain as well. The
more interesting question is how the active antenna "works" over the
entire HF range without retuning!

The potential problem with a tee is that it provides no isolation
between the two receivers. But I doubt that would be a problem. All it
takes is a couple of dollars and a few minutes to find out.

Chuck