开云体育

I ran across a funny one in one of my 301's.?

I am fairly certain that Yaesu did ship their radios with Trio Kenwood speakers installed..

Pic posted under funny.

did <NOT> ship

Jim and the group,

Per notification sent to the group. I have added a folder in the 'Files' section with what information I have here regarding filters. No, I don't speak Japanese either!

Interestingly, the filter board in my FT-301D has UK, after-market units installed in the AM and CW positions. The after-market CW filter is a 250 Hz bandwidth unit, whereas the stock Yaesu part is, I believe, 600 Hz bandwidth. Presently, I have this three-filter board installed in my FT-301, which I have recently finished repairing. It sounds nice on all modes. I have not yet done the ELCON mods to improve the matching around the IF filters.

My FT-301D is still in pieces. I need to re-fit the VFO which I had apart to fix and assemble and install an ELCON replacement digital display board. The filter board in the D has only two units fitted - the Yaesu stock SSB and CW ones. The picture I posted to the folder shows the links needed on the board for the AM receive signal path to pass through the SSB filter in the absence of a dedicated AM one.

One experiment I intend to try on this two-filter board is the trick that is commonly used on Drake TR-7 radio.There's a roofing filter (XF301) on the IF unit, separate to and ahead of the mode-specific / channel filters. XF301 is shown as type '9M20A', so I'm guessing it's 20 kHz BW at the nose. I intend to make up and test a 'dummy' AM filter, comprising a 'T' pad attenuator (500-Ohm Z, 6 dB loss), with 150 Ohm series arms and a 680-Ohm shunt arm. 20 kHz is really way too wide for AM on congested bands but might be usable.


Like you, I am also curious as to the differences between and FT-301D and an FT-301AD. I have never seen the AD variant here in the UK. Maybe the AD just had the last of the model changes rolled-up into the production run. Somewhat like the FT-101F (which, again, I have never seen an example of on this side of the pond) vs. FT-101E.

Regards,

Mark, G4FPH.

Hi Mark,

I also have two after-market filters that mostly have unintelligible writing on them. I <think> one of them is an Inrad/FoxTango (Blue lettering/sticker) 250Hz CW and the other might be a Wilson 6KHz AM with the correct center frequency. At least that's what the person I purchased it from told me. At some point I will sweep them on the spectrum analyzer and see how they look. But it's not a high priority for me right now. I don't run across filters for 301's very often. It's been my experience that CW filters are more available than AM filters. Comparatively speaking I don't think there were that many 301's sold and even fewer filters for them. No one really can really charge very much for them because the radios themselves aren't worth that much..

The rigs (that I am aware of) that used these same filter's (center frequency) were DZ-Kit's original Sienna rig - and they stopped offering the optional filters for sale about the same time that Inrad discontinued them (which was a looong time ago), the Yaesu FT-7b, R-530 (old Galaxy receiver??). So if anyone ever runs across any of these rigs, take a peek inside - you might find gold (in dem der hills).

Dayton/Xenia is next month - anyone going? One can usually find something they are looking for, but you might have to pay more than you want.