Codan to Alinco dx 70th
Submitted: Wednesday, Jun 22, 2005 at 13:12
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Erol vk2np
Hi
Forum
Im wanting to match a Codan 8558 antenna to a Yaesu FC707 manual tuner to Alinco DX70TH HF rig, does anyone have any ideas on making this config work, also i require the wiring setup to the milspec plug on the antenna, such as power, earth, etc,
my thoughts were to run the coax from the antenna to the tuner the the rig, and manualy operate power to the antenna from within the car to change the impedance, i can
check the VSWR with the inbuilt VSWR metre in the Yaesu,
the car is an 80 series cruiser, i also carried out the impedance mod inside the antenna, suggested for the 80 series..
Your thoughts and help would be greatly appeciated..Thankyou..vk2np
Reply By: Erol vk2np - Wednesday, Jun 22, 2005 at 15:23
Wednesday, Jun 22, 2005 at 15:23
Hi all
Ok now im getting confused, to my understanding of the Codan setup is this,, the rig, to the 8551 autotuner then to the 8558 antenna, ??? this is correct isn't it.?
Now i would only be using the manual tuner for fine tuning if nessersary and more for checking the vswr, my main conern is the pinout on the antenna so as to run power to adjust the tuning coil for the different bands..
Many thanks to you all for your help keep the replies coming..
Regards Erol vk2np :-)
AnswerID:
116902
Follow Up By: Footloose - Wednesday, Jun 22, 2005 at 15:27
Wednesday, Jun 22, 2005 at 15:27
The 8551 is an interface from a Codan 8525 that drives that 8558. This isn't necessary for an amateur tranceiver.
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Follow Up By: Michael Carey - Wednesday, Jun 22, 2005 at 15:51
Wednesday, Jun 22, 2005 at 15:51
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.
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