[VHFcontesting] Yaesu FT100D problem on 6m

[Tad Danley]

After my D model was updated at the factory I still had some 
intermittent issues on 6 and 10 meters. The final fix for mine was a 
very short and stout ground lead from the radio directly the the frame 
of my Durango.

Tad Danley, K3TD

On 2/12/2015 10:50 AM, Dave Olean wrote:
> 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 at fidmail.com>
> To: <gmitch at iowatelecom.net>
> Cc: "vhf contesting" <VHFcontesting at 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 at 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 at 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 at 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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