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Hi all,

and thanks for welcoming me into the group. I'm Pino IK2HEW and own an FT-301D since I was sixteen. After more than 25 years I've powered up it again and now I'm trying to restore it.
I have a couple of questions for experts. Despite my research, I never got an answer.
Does anybody know the use of the 3.5 mm jack below the rubber plug on the rigth side of the case ?
It disconnect power to the premix board and route the signal coming from the jack to the RF board in place of the one coming from the premix.
The second question concern the know differences between the FT-301D and FT-301AD versions.
I never found any document on this subject.

Thank you all in advance for your help.

Pino.

Pino,
Benvenuto.

The 3.5mm jack is an undocumented feature to break and connect to the RF CARD directly. Why, I no idea but the schematic shows it. Patso. Perhaps a way to use only the RF CARD and PA for factory test purposes?

The different models are low power variants but documentation does not exist.

Cheers,

Randy
Arizona USA

Hi Randy,

thank you for your answer, I also made the same hypothesis but there is no need of an accessible point for maintenance with the cover closed.
Just rotate the jack 90 degrees and you save an hole and a rubber plug.
I also made another guess about a possible synthesizer accessory, never sold.
At that time, as far as I know, no amateur transceiver had memories and Yaesu already proved its "capabilities" with the FT-225's memory unit accessory.
May be that somewhere, somebody have an hidden picture.....
Or just an idea to connect there a DDS to the FT-301...

About the "A" version, digital, with booster unit installed, as visible on advertising, have you ever heard about differences with the non-A ?

Thank a lot again.

Cheers,

Pino.

At 02.20 02/06/2020, you wrote: