John,
No one seems to have direct knowlege of what is actually wrong. I
suspect that you need to find the SWR sensing circuit and follow the rf path
to the output fitting. It must be a significant length on 50 MHz at least to
ruin the 50 ohm path. The way to find it is to inject a signal with a SWR
bridge and sig gen right at the SWR circuit board and look towards the
output connector. You can see what the SWR is with a 50 ohm load in the
connector. Poke and prod to find what is making the SWR bad. An antenna
analyzer would work ala MFJ or Rig Expert. I have a homemade bridge that is
good to about 500 MHz along with a signal generator (with 1000 Hz tone) and
an HP 415E SWR indicator. It would work swell for this too. Otherwise, you
have to rely on your own lyin' eyes. I am thinking that a poor or missing
ground might allow a part of the circuit to lift and act as a tuning stub
and ruin the nice 50 ohm path. I wonder if there is any filtering after the
SWR circuit. It could be flakey. Without a schematic or seeing it, it would
be hard to guess.
Dave K1WHS
----- Original Message -----
From: "John Geiger" <af5cc@fidmail.com>
To: <gmitch@iowatelecom.net>
Cc: "vhf contesting" <VHFcontesting@contesting.com>
Sent: Thursday, February 12, 2015 4:36 PM
Subject: Re: [VHFcontesting] Yaesu FT100D problem on 6m
What was the fix for this? It is a late model (2L serial number range)
that should have the grounding mod done at the factory. It doesn't seem
to
have problems with any other bands, like some of them did. This is one
temperamental model, that is for sure.
73 John AF5CC
On Thu, Feb 12, 2015 at 10:12 AM, <gmitch@iowatelecom.net> wrote:
I had 2 of the "D" models that also did this as well as 3 of the pre "D"
models. I do
believe the "D" models I had (still have one) were the early models as
well.
I also had a FT-897 that did this as well.
73
Gene
N0DQS
-----Original Message----- From: Tad Danley
Sent: Thursday, February 12, 2015 6:19 AM
To: vhfcontesting@contesting.com
Subject: Re: [VHFcontesting] Yaesu FT100D problem on 6m
I think some early D models had this problem as well. I purchased my
FT-100D in 2000 and had the high SWR problem on 6 and 10. A warranty
trip to Yaesu fixed it with the additional grounding.
73,
Tad Danley, K3TD
On 2/12/2015 6:08 AM, Mike (KA5CVH) Urich wrote:
On Wed, Feb 11, 2015 at 8:54 PM, John Geiger <af5cc@fidmail.com> wrote:
I have not seen this problem in a FT100D before.
Mike asks
Are you sure its a "D"? This was a problem on the "pre-D" models, not
only on 6 but 10 & 12 as well. My "non-D" had to go back to Yaesu so
they could do the additional grounding that was necessary. They
repaired it and shipped it back to me at no cost. They also flashed
the firmware to the "D" firmware at the same time.
No problems since.
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