On Sun, 28 Aug 2005 12:57:06 GMT, "Bill Smith"
wrote:

Hello all,
My station consisted of an Icom 706MKIIG, the AH-4 tuner and a 360ft loop at
60 feet. The tuner is mounted at the loop on the roof with about 100ft of
coax to the rig.

I just purchased a Kenwood TS-870s with built in tuner. I'm running it on
the same feedline and thru the unpowered AH-4. The built in tuner works fine
and all seems good.

Question: I want to remove the AH-4 to go with my 706 for mobile/remote use.
Would a 1:1 balun work in place of the AH-4 to connect the loop to the
feedline? I work 15 thru 80 most of the time.


Smitty,

I have more questions than answers. The AH4 is designed to match a
single wire (whip) antenna working against ground as best I can
figure.

http://home.comcast.net/~hamlakemn//ah4/ah4.htm

You say your loop is at 60' but the tuner is on the roof at the loop.
Is the roof 60' high?

Is this a real closed loop? If so how is the tuner connected?

With more loop parameters known, maybe it could be modeled to
determine whether a balun will function okay and whether the mismatch
on the coax will be acceptable.

What kind of coax are you using?

The '870 is a fine radio...got one myself.