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Next: Question - shallow water operation
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External
Since: Apr 03, 2006
Posts: 11
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(Msg. 1) Posted: Sun Apr 16, 2006 10:47 am
Post subject: ICOM-M802 SSB
Archived from groups: rec>boats>electronics (more info?)
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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 |
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External
Since: Feb 16, 2006
Posts: 27
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(Msg. 2) Posted: Sun Apr 16, 2006 11:04 am
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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. |
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External
Since: Jan 21, 2006
Posts: 26
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(Msg. 3) Posted: Sun Apr 16, 2006 3:55 pm
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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hmmm wrong track I guess.....
802 is an HF only device. The reason for the two RF connectors is because
it's a class E DSC where you have to be able to receive DSC sentences
*while* transmitting. Therefore it's has to have two antenna's.
Remeber that even if we "spare-time-sailors" most often use VHF ch 70 for
DSC, it's quite possible to run DSC on HF.
/Bjarke
"purple_stars" <webnews1 DeleteThis @hotmail.com> wrote in message
news:1145210672.648571.98320@e56g2000cwe.googlegroups.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.
> >> Stay informed about: ICOM-M802 SSB |
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External
Since: Nov 05, 2005
Posts: 1354
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(Msg. 4) Posted: Sun Apr 16, 2006 4:57 pm
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Wet-n-Wild Bill" <snews.TakeThisOut@news.us> wrote in
news:F4adnXyZT4jWHt_ZnZ2dnUVZ_umdnZ2d@wavecable.com:
> 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... >> Stay informed about: ICOM-M802 SSB |
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External
Since: Nov 05, 2005
Posts: 1354
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(Msg. 5) Posted: Sun Apr 16, 2006 4:59 pm
Post subject: Re: ICOM-M802 SSB how to connect one antenna to two antenna ports on the back of the radio [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Ted" <Ted RemoveThis @nospam.com> wrote in news:DUw0g.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.... >> Stay informed about: ICOM-M802 SSB |
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External
Since: Apr 03, 2006
Posts: 11
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(Msg. 6) Posted: Sun Apr 16, 2006 6:08 pm
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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" <noone.RemoveThis@home.com> wrote in message
news:Xns97A7AC8994987noonehomecom@208.49.80.253...
> "Wet-n-Wild Bill" <snews.RemoveThis@news.us> wrote in
> news:F4adnXyZT4jWHt_ZnZ2dnUVZ_umdnZ2d@wavecable.com:
>
>> 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...
> >> Stay informed about: ICOM-M802 SSB |
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External
Since: Feb 24, 2006
Posts: 35
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(Msg. 7) Posted: Sun Apr 16, 2006 6:55 pm
Post subject: Re: ICOM-M802 SSB how to connect one antenna to two antenna ports on the back of the radio [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Larry" <noone.DeleteThis@home.com> wrote in message
news:Xns97A7ACF141135noonehomecom@208.49.80.253...
> "Ted" <Ted.DeleteThis@nospam.com> wrote in news:DUw0g.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. >> Stay informed about: ICOM-M802 SSB |
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External
Since: Feb 24, 2006
Posts: 35
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(Msg. 8) Posted: Sun Apr 16, 2006 7:27 pm
Post subject: Re: ICOM-M802 SSB how to connect one antenna to two antenna ports on the back of the radio [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"purple_stars" <webnews1 DeleteThis @hotmail.com> wrote in message
news:1145210672.648571.98320@e56g2000cwe.googlegroups.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.php?CatID=1&famID=6&childID=0
http://search.cartserver.com/search/search.cgi?cartid=a-6994&category=...prices&
The MX62 also looks like it will work:
http://www.rfparts.com/diamond/mx62m.html
http://search.cartserver.com/search/search.cgi?cartid=a-6994&category=...prices&
These products are also available at
http://www.hamradio.com/
and
http://www.universal-radio.com/catalog/hamantm/cduplex.html
Here are some other links:
http://search.cartserver.com/search/search.cgi?cartid=a-6994&category=...prices&
http://www.diamond-ant.jp/ama2/eng_ama_2_7_6.asp
http://www.marcucci.it/english/prodotti/schede/scheda.asp?ID=13229
http://www.hfelectronics.be/Ant/DIAMOND/MX-3000.htm >> Stay informed about: ICOM-M802 SSB |
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External
Since: Nov 05, 2005
Posts: 1354
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(Msg. 9) Posted: Sun Apr 16, 2006 8:51 pm
Post subject: Re: ICOM-M802 SSB how to connect one antenna to two antenna ports on the back of the radio [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Ted" <Ted.TakeThisOut@nospam.com> wrote in
news:CPy0g.3806$BS2.1925@newsread1.news.pas.earthlink.net:
> 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.
>
>
If we are helping the "average boater", who is not an electronics person,
any response to this thread about diplexers may lead him astray to putting
a diplexer in his antenna line, as this thread had nothing, whatsoever, to
do with VHF or AM/FM radio or diplexers.
I'd just hate to see him try a diplexer to such a nice radio as the M802,
in spite of the M802's shortcomings of the wide open cabinet with the
internal cooling fan sucking sea air into the circuits, a really stupid
design with its chinzy cable connectors, to boot.
He was looking for "the easy way out", some method of connecting those two
tempting connectors together to one cable....a path YOU were providing him
with I pray he ignores...
I don't even want him to put up a receiving antenna anywhere near the
transmitter's antenna for fear of taking out the DSC front end, which is
broad tuned for the whole HF band. >> Stay informed about: ICOM-M802 SSB |
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External
Since: Mar 06, 2006
Posts: 29
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(Msg. 10) Posted: Sun Apr 16, 2006 11:16 pm
Post subject: Re: ICOM-M802 SSB how to connect one antenna to two antenna ports on the back of the radio [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Feb 25, 2006
Posts: 7
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(Msg. 11) Posted: Mon Apr 17, 2006 1:08 am
Post subject: Re: ICOM-M802 SSB how to connect one antenna to two antenna ports on the back of the radio [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Nov 05, 2005
Posts: 1354
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(Msg. 12) Posted: Mon Apr 17, 2006 7:38 pm
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Wet-n-Wild Bill" <snews DeleteThis @news.us> wrote in
news:5JidnTW4CfsSd9_ZRVn-tg@wavecable.com:
> 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. >> Stay informed about: ICOM-M802 SSB |
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External
Since: Nov 28, 2004
Posts: 17
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(Msg. 13) Posted: Tue Apr 18, 2006 5:35 am
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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. >> Stay informed about: ICOM-M802 SSB |
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External
Since: Jan 21, 2006
Posts: 26
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(Msg. 14) Posted: Tue Apr 18, 2006 8:55 am
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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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" <sthoma20_lowspam_ DeleteThis @sympatico.ca> wrote in message
news:FV21g.1029$DR6.86955@news20.bellglobal.com...
> 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.
>
> >> Stay informed about: ICOM-M802 SSB |
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External
Since: Feb 24, 2006
Posts: 35
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(Msg. 15) Posted: Tue Apr 18, 2006 1:22 pm
Post subject: Re: ICOM-M802 SSB [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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the owners manual is here:
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" <BjarkeMC DeleteThis @grevestrand.de(nej, det skal selvfølgelig
være med K da jeg er dansker)> wrote in message
news:4444c8fc$0$67256$157c6196@dreader2.cybercity.dk...
> Don't mess around with switches. To much risc. Check if it can be
> confugured for a lower rate DSC (class D) where send/receive takes place
> on the same (primary) antenna.
>
> Bjarke
>
> "Steve Thomas" <sthoma20_lowspam_ DeleteThis @sympatico.ca> wrote in message
> news:FV21g.1029$DR6.86955@news20.bellglobal.com...
>> 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.
>>
>>
>
> >> Stay informed about: ICOM-M802 SSB |
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