Codan to Alinco dx 70th

Yes I saw the post but was a bit confused with it, had to read it 10 times and think carefully. At this stage can't add anymore to Jim's post below.

Sorry Erol I'm not familar with the Codan gear. So the Codan tuner is external to the antenna. Plug it in to your Yaesu tuner hit the 10 watt button on the Alinco and see how it tunes. If your tuner is manual why do you need pinout info. Those codan antennas a relativity small aren't they, you may do better with a base and a 3 metre whip.

Sorry guys, I am familiar with the Codan stuff...intimately :)) The 8558 is an autotune antennae. It consistes of a base and a whip screwed into the top. The aerial will tune 2-30 meg but unlike its big brother the 9350, is susceptable to earthing problems.
If he has an 8558 then there is no need for an inline tuner, as the imput Z of the autotune is around 50 ohms, the same as the coax he plugs into his radio. The autotune does all the tuning necessary for a good match. Putting another tuner inline adds to losses and makes tuning up a lot more complex than it needs to be.

The 8551 is an interface from a Codan 8525 that drives that 8558. This isn't necessary for an amateur tranceiver.

The 8551 is the controller for the 8588 antenna. In later 8528 series radios, they had an internal board fitted and the radio software controlled the stepper motor in the antenna body while looking at the VSWR as measured at the antenna socket.
The 8551 has a microcontroller/stepper motor driver/VSWR bridge that does the same. In effect the control cables going from the 8551 to the radio are the same as the newer 9350 antenna.
Five control lines are :-

GND
+12V
Tune (take to GND to start tune process with RF present)
Indicator (gives tune pass/fail in conjunction with Tune line)
Scan

Also, there were several generations of the 8558 antenna. The 'A' series were all quite good, built by hand. 'B' and 'C' were a little nasty, built with a polycarbonate body that didn't seal against the top and base properly.
The 'D' series went back to a fibreglass body and were better than 'B' and 'C' series.
All pale in comparison to the 9350, which has all the smarts to run the antenna in the base of the antenna.

Please don't ram 400W into the 8558! It will not like it very much at all...
To tune, (with an 8551) you need around 30-50 watts.
Voice peak type power at 100W will keep the antenna happy. CW and the like (eg. Selcalls and Data) have to be kept in check when using an 8558. Continuous use of high duty-cycle modulation will heat up the loading coil inside....

Michael, his limit is 400w PEP which equates to around 100w carrier.

I think 100w carrier is too much for the 8558. The 9350 antenna is rated at 125W PEP, I'm sure the 8558 would be similar.

Yep, 125w PEPrating on the blurb. However that only equates to around 40w carrier. I've always had around 80-100w carrier out without any ill effects on either an 8558 or a 9350.