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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

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

I warmed up the computer and asked it. Says a 90c is 600hz. If that works for you I have one. Dave

Hi Bob. The 90c is the cw filter for the 301. I’m not finding the spec on that straight away but I think it is 500hz. I have plenty of them and will trade with you. Confirm the band width. 73 Dave

I have installed in my radio a 250HZ cw filter, 8999.3 khz does anyone have a 500HZ filter they would like to sell or trade for the 250 hz filter I have?? Robert KH2BR

Turning the anti trip did not work, swapping out the vox unit board did not help so today I will spend my time tracing wires. Robert KH2BR

Make sure the anti trip is up.

I soaked the mode switch with Deoxit and that did not fix the problem. I turned the vox gain all the way down and that did not help? BUT !!! ,,,? I discovered what is causing it. When the? CW key