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Old 25-10-2017, 09:06   #31
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Get to South Africa with a "buddy boat" in VHF distance who can do weather or If you have an iridium phone, send your daily position to Sam, SAMMN, at zs1sammnet@worldonline.co.za and he will send your daily WX and warnings. Or send me a PM and I will route you via sat phone SMS. If you have no sat phone, a buddy boat is your option.

When you get to SA you can have your 802 repaired at Multisource in Johannesburg.

You need to soon make a move out of the region as cyclone season is soon to start.

John.
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Old 25-10-2017, 09:10   #32
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Forgot to say: Start listening to Sam on 14.316 MHz @ 11:30 UTC and see if you can receive him - he tx's to the Indian Ocean first then swings his beam to the Atlantic.

John
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Old 25-10-2017, 14:56   #33
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

One solution not yet mentioned is to buy a manual tuner for the short term use of your radio. Not as convenient as the auto tuner, but pretty fool proof... and inexpensive, too!

FWIW, I've used a manual tuner (MFJ Versa tuner II) now for over thirty years of maritime mobile service. Cost something like 150 bucks when new, still going strong.

Jim
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Old 25-10-2017, 15:57   #34
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Quote:
Originally Posted by Jim Cate View Post
One solution not yet mentioned is to buy a manual tuner for the short term use of your radio. Not as convenient as the auto tuner, but pretty fool proof... and inexpensive, too!

FWIW, I've used a manual tuner (MFJ Versa tuner II) now for over thirty years of maritime mobile service. Cost something like 150 bucks when new, still going strong.

Jim
Turns out the M802 of the OP is simply not putting out RF.

But I too have used a manual tuner when I was having trouble with the AT-140. The SWR loss at typical HF frequencies associated with having the tuner at the radio end of the coax going to the backstay was not debilitating, and I was still able to make connections without undue trouble.

Chip
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Old 25-10-2017, 18:04   #35
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

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Originally Posted by SoonerSailor View Post
Turns out the M802 of the OP is simply not putting out RF.

But I too have used a manual tuner when I was having trouble with the AT-140. The SWR loss at typical HF frequencies associated with having the tuner at the radio end of the coax going to the backstay was not debilitating, and I was still able to make connections without undue trouble.

Chip
No need to run coax to the backstay. GTO15 works fine and has little effect upon the SWR. Becomes part of the antenna, of course, and may be awkward to route through the cabin.

As I have posted many times, I just run the whole rig as my antenna, no insulators other than the hull. In this case, the feed from the tuner to the chainplate is a mighty 18 inches long!

But this is a digression from the OP's dilemma, so I'll bow out.

73,

Jim
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Old 25-10-2017, 18:21   #36
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Oops. I meant coax to the non functioning AT-140.
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Old 26-10-2017, 00:50   #37
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Bill,
Quote:
Originally Posted by btrayfors View Post
All this long-distance guessing is disturbing to me, in the extreme. For want of a good SWR/power meter and a dummy load....
...THEY ARE WIDELY AVAILABLE...
...but I'm really tired of this when the resolution is very simple and cheap.
I agree, and these should be aboard before leaving home, as they are NOT widely available. They would have expedited diagnosis in my case, but certainly not resolution.

Quote:
Originally Posted by btrayfors View Post
Don't ignore the tuning/control cable...
...Tuners do go bad, too.
As indicated above, the control cable was not the issue (though it did need overhaul), nor was the tuner itself. The problem was in the transceiver/transmitter, and yes, with an SWR/power meter, I would have known this much sooner than I did.

Dirk
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Old 26-10-2017, 03:47   #38
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Quote:
Originally Posted by btrayfors View Post
All this long-distance guessing is disturbing to me, in the extreme. For want of a good SWR/power meter and a dummy load.......

NO BOAT SHOULD LEAVE PORT WITHOUT THESE TWO VITAL PIECES OF GEAR. FOR A TOTAL INVESTMENT OF UNDER $100 THEY ARE WIDELY AVAILABLE AND WOULD IMMEDIATELY HELP TO DETERMINE THE PROXIMATE CAUSE.
You will spend a bit more than Bill proposes but I suggest this SWR/power meter: https://www.universal-radio.com/cata...ters/2140.html because it provides valid numbers at VHF as well as MF and HF.

I use this dummy load http://amzn.to/2zQm7jy . Power handling is limited but you can turn down the power from your HF/SSB and get quite good data. It's test equipment, not in use all the time. I have two.

Total cost around $200.
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Old 03-11-2017, 08:18   #39
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Thanks for the great tips.
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Old 03-11-2017, 08:22   #40
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Resolution: After nine weeks without comms, our new radio arrived here in Reunion this afternoon. It's installed and working fine. When we get back to the states, I'll probably send the old one back to Icom for a new transmitter board.

Thanks again to everyone who chimed in!
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Old 03-11-2017, 13:45   #41
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Re: Icom AT-140 tuner with M802 HF radio (SSB) stopped tuning

Quote:
Originally Posted by btrayfors View Post
All this long-distance guessing is disturbing to me, in the extreme. For want of a good SWR/power meter and a dummy load.......

NO BOAT SHOULD LEAVE PORT WITHOUT THESE TWO VITAL PIECES OF GEAR. FOR A TOTAL INVESTMENT OF UNDER $100 THEY ARE WIDELY AVAILABLE AND WOULD IMMEDIATELY HELP TO DETERMINE THE PROXIMATE CAUSE.

Sorry for the rant, but I'm really tired of this when the resolution is very simple and cheap.

Don't ignore the tuning/control cable. The connectors at each end are a disaster....not waterproof and very prone to corrosion and breaking when you attempt to remove them. Also, I've seen a NEW control cable defective in a NEW 802 installation in Annapolis. Apparently it was stressed too hard during installation, and had broken conductors inside. Replaced the wire and bingo: everything now worked.

Tuners do go bad, too. However, the AT140 is an excellent piece of gear and it is very well waterproofed....unlikely to be compromised inside. EXCEPT, as mentioned, sometimes the mechanical connections inside are not tight, especially for the ground.

FWIW,

Bill
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