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I just got back from using my FT-857D and FC-40 in N. Maine on a
canoe trip. I used the FT-857D on battery (with a 14W solar pannel)
and the FC-40 connected to a random wire (~30-33m) most of the time
only about 10-15m high. I was using a sling to string the wires up
in the trees so I couldn't get too high. I also used about 25m of
counterpoise running on the ground.

I was able to get tuned fairly well on 20m and most of the time on
40m. 80m was generally a problem with the tuner as I got HSWR most
of the time. I didn't think 33m was close enough to 1/2? (40m) for
it to be a match problem on 80m.

Does anyone know the range of impedences that the FC-40 can match?

Another thing that I noticed is that on 80m my carrier would have
practically little SWR but my voice modulation (LSB) would peak the
SWR.

I also had some complaints while QSOing across the Atlantic about
QSB. This may be the becuase of the FT-857D sutting down due to HSWR
peaks.

I also tried using the FC-40 with a 5x10m vertical loop 2m off the
ground. This had the same tuning characteristics.

--jon

--- In YaesuTuner@..., "ab1ff" <ab1ff@y...> wrote:

I just got back from using my FT-857D and FC-40 in N. Maine on a
canoe trip. I used the FT-857D on battery (with a 14W solar pannel)
and the FC-40 connected to a random wire (~30-33m) most of the time
only about 10-15m high. I was using a sling to string the wires up
in the trees so I couldn't get too high. I also used about 25m of
counterpoise running on the ground.

I was able to get tuned fairly well on 20m and most of the time on
40m. 80m was generally a problem with the tuner as I got HSWR most
of the time. I didn't think 33m was close enough to 1/2? (40m)

for

it to be a match problem on 80m.

Does anyone know the range of impedences that the FC-40 can match?

Another thing that I noticed is that on 80m my carrier would have
practically little SWR but my voice modulation (LSB) would peak the
SWR.

I also had some complaints while QSOing across the Atlantic about
QSB. This may be the becuase of the FT-857D sutting down due to

HSWR

peaks.

I also tried using the FC-40 with a 5x10m vertical loop 2m off the
ground. This had the same tuning characteristics.

--jon

Jon & The Group:

There are about five FC-40 reviews on eham.net so far, some of them
dealing with wire length(s), and impedence the FC-40 did/did not
match (info that is sadly missing from the Yaesu brochure AND
manual). The reviews can be found at


As always, based upon your individual installation, you may find
differences.

Looks like an antenna analizer would be a good addition to the kit,
at least long enough to do some experimenting.

One other question: Jon, how did you terminate the loop? Just connect
it to the ground terminal of the FC-40, or what? Yes, I'm a newbbie
to the world of tuners and wire antennas. Thanks.


73
Gary
KC9DJQ

yes, I just conected the loop to the two connectors. I asked Yaesu
about using the tuner on balanced and unbalanced lines and they said
it should be fine. It worked well except for the QSB which I believe
came from excessive SWR.

73,
Jon
AB1FF

--- In YaesuTuner@..., "gkstemple" <gkstemple@a...>
<snip/>

One other question: Jon, how did you terminate the loop? Just

connect

it to the ground terminal of the FC-40, or what? Yes, I'm a newbbie
to the world of tuners and wire antennas. Thanks.


73
Gary
KC9DJQ

On the 540 foot loop I made for field day I used 25 foot of ladder
line from the tuner to the wire for my loop,,,,was 25 foot enough?
GOT ME but it worked well and I used it on several bands that day. I
only used 25 foot because I mounted the FC-40 on the tree next to my
tent and 25 foot was all the higher I could get the loop,,,,well I
was lazy I could have got it higher but ,,,well we all know how hot
the summer was here in the midwest this year,,,,I took what I could
get =)


--- In YaesuTuner@..., "ab1ff" <ab1ff@y...> wrote:

yes, I just conected the loop to the two connectors. I asked Yaesu
about using the tuner on balanced and unbalanced lines and they

said

it should be fine. It worked well except for the QSB which I

believe

came from excessive SWR.

73,
Jon
AB1FF

--- In YaesuTuner@..., "gkstemple" <gkstemple@a...>
<snip/>

One other question: Jon, how did you terminate the loop? Just

connect

it to the ground terminal of the FC-40, or what? Yes, I'm a

newbbie

to the world of tuners and wire antennas. Thanks.


73
Gary
KC9DJQ