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Oh. And PS. I modified a few of the IF boards per Roland. He’s a smart guy, has a doctorate in electronics! Way smarter than me but the IF mod didn’t work right. Had a side effect so I put all of

The filter on the NB board is only on the hi power models. Forget the computer stuff. You need a tone generator and a signal generator. I use a IFR 1200S and a Motorola two tone generator to adjust

The 301 had a couple of bugs out of the gate. One is the “crab walk” problem on the pre-mix board and the other major one is the one your working on. I wrote an a alignment procedure for the one

Dave, Thanks for the mails. Yes, please send a copy of your alignment procedure. You clearly have a lot of experience with these old things. Agreed, no service manual, as such (not like for the

Digging into this a little more today. Using my SDR transceiver as a narrow-band, RF spectrum analyser, I checked the DSB TX IF signal going into the Filter Unit. Audio fidelity from the mic. I

Hi to all in the group! I'm close to the end of repairing an FT-301D transceiver and trying to get the transmitted audio quality sounding anything like 'nice'. It's proving surprisingly challenging.

Hi Chaz The problem is known to occur with the VOX-UNIT on a >40 year old device. Q604 is only a comparator that switches the relay RL-1 (TX) when pin6 is LOW. This can have the following causes: 1.

Hi, all, I see there was some other thread about a vox problem, but no resolution posted. ?I’ve been tracing the schematic and reading the manual and taking measurements, but I’m having an issue

Thanks !!!? This morning I found one on ebay and if it is a dud, I will get back to you. Bob..KH2BR

I’ve probably got some driver boards untested. I have lots of parts, Bob. I’m just about to fire up this 301s 7 H xxxxxx

Does anyone have or know of a substitute for the 10 watt amp finals ?? the original part number is a s10-12 Rober KH2BR

It is a FT301 analog that needs the amp and is arriving thursday. It may need other things so I better wait so please reserve a 600hz filter for me and the amp if you have one. I could use my Juma amp

I undestand completly Bob. I have a 600 khz filter as I had mentioned. 25 bucks.. I have also RF decks if you wish to put it on the back of the one you have coming. Make sure it isn’t an SD. SD’s

I have? radio number one that has only a ssb filter and it is strapped to the AM and CW position. The problem with a ssb filter being used in CW is that strong stations near my operating frequency

Not sure I follow Bob. Did you strap the SSB filter to the CW filter slot on the filter board? I actually have a mod to select all there filters on the front panel but it’s a lot of work. AM filter

I dont know how to send a private message on here, so this is the only way. Dave How much do you want for the 600HZ cw filter?? I discovered that the SSB filter will not cut it in CW mode. Or Do you

Ok, Here is the symptom. Even with the symptom and it is not a solid fail. The radio works ok even with the symptom. with no key plugged into the key jack, rotating the mode switch thru all of its

That sounds like a fun problem. I need to hear the symptoms again. I ran into something similar once and it was a problem with the VOX stuff I haven’t worked on one of those in years and the memory

The manual is just better than nothing barely. Hi

600 is to wide.. I have a sotabeams DSP filter here that I will try. It may be better then any mechanical filter. They have trace comparisons between a collins filter and sotabeams. Very impressive