I'm looking at SSB for my boat the ICOM-M802 has two RF conectors one to
the Autotuner and the other for DSC Receive.

If i opt to only use one antenna for thr Autotuner AT-140. Will i be able
to use the DSC function of my radio? if so with what linitations?

Bill

bill, i'm not positive but i'm 90% sure you won't be able to. i use my
own icom, the ic-706mkiig, as an example ... it has two antenna
connectors too, one for HF and one for uhf/vhf. if i don't connect an
antenna to the first i can't use HF, and if i don't connect an antenna
to the second i can't use uhf/vhf. well, i CAN .. but i won't hear
anything since i won't have an antenna lol. i'm betting it's the same
with the icom-m802 (nice radio btw), that it just won't do the function
if it doesn't have an antenna. what i'm saying is that in the 706mkiig
there is no switch to say, "hey, radio, use the other antenna instead
because that's all you've got", instead it simply goes to the antenna
that it's expecting to have for certain frequencies and if the antenna
isn't there then it just gets lousy reception and that's the end of it.

"purple_stars" wrote in message
ups.com...
bill, i'm not positive but i'm 90% sure you won't be able to. i use my
own icom, the ic-706mkiig, as an example ... it has two antenna
connectors too, one for HF and one for uhf/vhf. if i don't connect an
antenna to the first i can't use HF, and if i don't connect an antenna
to the second i can't use uhf/vhf. well, i CAN .. but i won't hear
anything since i won't have an antenna lol. i'm betting it's the same
with the icom-m802 (nice radio btw), that it just won't do the function
if it doesn't have an antenna. what i'm saying is that in the 706mkiig
there is no switch to say, "hey, radio, use the other antenna instead
because that's all you've got", instead it simply goes to the antenna
that it's expecting to have for certain frequencies and if the antenna
isn't there then it just gets lousy reception and that's the end of it.


You could get a diplexer to connect both antenna ports to one antenna

It looks like the CF-530 is what you need:

http://www.cometantenna.com/products...ID=6&childID=0

http://search.cartserver.com/search/...keywords=cf530

The MX62 also looks like it will work:

http://www.rfparts.com/diamond/mx62m.html

http://search.cartserver.com/search/...go.x=21&go.y=9

These products are also available at

http://www.hamradio.com/

and

http://www.universal-radio.com/catal...m/cduplex.html

Here are some other links:

http://search.cartserver.com/search/...go.x=15&go.y=8

http://www.diamond-ant.jp/ama2/eng_ama_2_7_6.asp

http://www.marcucci.it/english/prodo...a.asp?ID=13229

http://www.hfelectronics.be/Ant/DIAMOND/MX-3000.htm

"Larry" wrote in message
...
"Ted" wrote in newsUw0g.2986$An2.2357
@newsread2.news.pas.earthlink.net:

You could get a diplexer to connect both antenna ports to one antenna



Sue him when you blow the hell out of it. These diplexers are for using
two radios on WIDELY SPACED-IN-FREQUENCY DIFFERENT BANDS! THEY DO NOT
DIPLEX WHEN BOTH RECEIVERS ARE ON THE SAME HF BANDS!

This nonsense will blow the DSC receiver's front end....I guarantee it.

DO NOT HOOK BOTH COAX CONNECTORS TOGETHER THROUGH ANYTHING!!

Geez....


Relax and take a deep breath larry before you pop a vein in your neck.

I was responding to a comment about the two antenna connectors being
designed for separate HF and VHF bands. That misconception about the M802
has been corrected. The ports on the diplexers I listed are band isolated
so if you did connect it to the M802 it wouldn't work properly but would not
"blow the DSC receiver's front end". You should stop and think before you
fuss.

In article . net,
"Ted" wrote:

You could get a diplexer to connect both antenna ports to one antenna

It looks like the CF-530 is what you need:

http://www.cometantenna.com/products...ID=6&childID=0

http://search.cartserver.com/search/...egory=newprice
s&maxhits=200&keywords=cf530

The MX62 also looks like it will work:

http://www.rfparts.com/diamond/mx62m.html

http://search.cartserver.com/search/...egory=newprice
s&maxhits=200&keywords=mx62&go.x=21&go.y=9

These products are also available at

http://www.hamradio.com/

and

http://www.universal-radio.com/catal...m/cduplex.html

Here are some other links:

http://search.cartserver.com/search/...egory=newprice
s&maxhits=200&keywords=duplexer&go.x=15&go.y=8

http://www.diamond-ant.jp/ama2/eng_ama_2_7_6.asp

http://www.marcucci.it/english/prodo...a.asp?ID=13229

http://www.hfelectronics.be/Ant/DIAMOND/MX-3000.htm


that could solve Purple_stars delema, but wouldn't solve the OP's
original problem, or answer his question......

The answer to the OP's question, is NO, you need the second antenna
for DSC to function.....

Thanks guy for the info! Since the M802 is HF along with the DSC. What coud
i do for a receiving antenna?

My boat which is all aluminum makes a great ground plane. On the Xmit/Rec
side i'm planning on a 23' whip. As for the DSC REC antenna, can i use a
shorter antenna, what options do i have to run a long wire, can i lay it in
an insulated surface in a zigzag pattern. Or must it be pulled straight from
the balun?

Bill


"Larry" wrote in message
...
"Wet-n-Wild Bill" wrote in
m:

If i opt to only use one antenna for thr Autotuner AT-140. Will i be
able to use the DSC function of my radio? if so with what linitations?



Nope. M802 requires one transmitting antenna through the autotuner and
another receiving antenna for its separately-scanning DSC receiver. Ours
on Lionheart is hooked up to the handrail bolt through the toerail. It
was
cheap and dirty as there's no room for another antenna, like a whip, that
wouldn't be in the way of sailing it. I was going to change it, but it
works just fine, what little actual HF DSC traffic is ever transmitted for
it to receive.

If you don't hook up the 2nd receive antenna, you won't have HF DSC
receive
scanner capability.

DO NOT TRY TO PUT A COAX T INTO THE TRANSMIT LINE AND BLOW THE HELL OUT OF
IT! I've seen two stupids, already, who did. It isn't pretty at 150
watts
into the DSC receiver...

"You" wrote in message
...
In article . net,
"Ted" wrote:

You could get a diplexer to connect both antenna ports to one antenna

It looks like the CF-530 is what you need:

http://www.cometantenna.com/products...ID=6&childID=0

http://search.cartserver.com/search/...egory=newprice
s&maxhits=200&keywords=cf530

The MX62 also looks like it will work:

http://www.rfparts.com/diamond/mx62m.html

http://search.cartserver.com/search/...egory=newprice
s&maxhits=200&keywords=mx62&go.x=21&go.y=9

These products are also available at

http://www.hamradio.com/

and

http://www.universal-radio.com/catal...m/cduplex.html

Here are some other links:

http://search.cartserver.com/search/...egory=newprice
s&maxhits=200&keywords=duplexer&go.x=15&go.y=8

http://www.diamond-ant.jp/ama2/eng_ama_2_7_6.asp

http://www.marcucci.it/english/prodo...a.asp?ID=13229

http://www.hfelectronics.be/Ant/DIAMOND/MX-3000.htm


that could solve Purple_stars delema, but wouldn't solve the OP's
original problem, or answer his question......

The answer to the OP's question, is NO, you need the second antenna
for DSC to function.....

agreed

"Wet-n-Wild Bill" wrote in
:

My boat which is all aluminum makes a great ground plane. On the
Xmit/Rec
side i'm planning on a 23' whip. As for the DSC REC antenna, can i use
a shorter antenna, what options do i have to run a long wire, can i
lay it in an insulated surface in a zigzag pattern. Or must it be
pulled straight from the balun?



You could use another 23' whip away from the transmitter's whip. The
receive antenna is not tuned. The 23' whip is naturally resonant around 10
Mhz, so that would be great for the whole HF band, better around 8-12 where
most of the receiving is done, anyway. Just ground the shield of the coax
to the hull and the center conductor to the whip, isolated from the hull.

If one didn't care about receiving DSC during transmit, wouldn't it be
possible to use an antenna relay, or a manual coaxial switch? I have never
seen the latter, but I am sure they must exist. There is little enough room
for hf antennas on a sailboat, but I really like your hand rail solution for
GRP boats.

the owners manual is he

http://www.icomamerica.com/support/manuals/ic-m802.pdf

On page 37, If I read it correctly, it says that the dedicated DSC receiver
and seperate DSC antenna is for scanning DSC distress/safety channels only
for distress, urgency and safety DSC messages. All other DSC functions are
available through the main antenna.



"Bjarke Christensen" (nej, det skal selvfølgelig
være med K da jeg er dansker) wrote in message
. dk...
Don't mess around with switches. To much risc. Check if it can be
confugured for a lower rate DSC (class D) where send/receive takes place
on the same (primary) antenna.

Bjarke

"Steve Thomas" wrote in message
...
If one didn't care about receiving DSC during transmit, wouldn't it be
possible to use an antenna relay, or a manual coaxial switch? I have
never
seen the latter, but I am sure they must exist. There is little enough
room
for hf antennas on a sailboat, but I really like your hand rail solution
for
GRP boats.