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Doc! You are thinking of a different radio. I've had my hands on many of these radios. Every one works like I said from the factory. No extra boards. I have seen what you are talking about somewhere but not in a TS-440.

Railroading? Too heavy. I have enough heavy stuff. It gets heavier every day.

yes along with its cousin the 1011c siltronix

I have the ts-430 kenwood with the optional 6kc AM filter which is much closer to 8kc and it's an awesome AM transceiver.

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I U 212

HiDef,
Every one of them that you've had your hands on may do the fast freq change with a fast spin. But what I'm talking about was a very slow frequency change with just a 'normal' turn of the knob. Not a Mhz per rev of the knob, but a 10 Khz change(?), huge 'fine' tune difference. To the best of my knowledge Inrad was the only source for those modules (or actually it was IRC, International Radio and Crystal, at the time, in Florida). That module was the only thing I wish I had kept when my '440 bit the dust. Oh well.
- 'Doc

What ever that rate of change was per rev of the knob, the module slowed it down by at least a factor of 10.

I just tried one. Slowly tuning I got 12 khz per 1 revolution on CW and ssb. AM was 60khz per revolution. If I fling the tuning knob it moves much faster but I cannot tell just how fast per revolution.

Now think of the 'fine' tuning if that were slowed down by a factor of 10.
- 'Doc

AM on 75 does not include as many boat anchors as it did in the past. Home brew class E, flex radios, and modified rice boxes with an amplifier are gaining popularity now. I use to run a FT-101ZD however it was a little harder to get right then a FT-101E because you have to bypass the width crystal filter in AM to get receive bandwidth. In fact the optional FT-101ZD AM filter is 100% useless in RX without this mod.

I now use a Kenwood TS-940SAT with a modification I designed. The modification is done in two steps. First is removing AM modulation from the IF strip entirely and modulating one of the RF stages. The second deals with Hi-Fi and changing various caps and the feedback loop used on the mic amp IC. The results are amazing once you back the ALC down.

I've done this type of modification to many HF rigs made around the 1990's including the IC-781. Unfortunately I only took the time to fully document the procedure for the TS-940S. If anyone has one of these and is interested in the mod with pictures, Just send me a message trough this site. As good as the FT-101 series was on AM, the modified TS-940S is much better in terms of power and newer features.

The radio will easily modulate a 50 watt carrier to over 100% positive peaks. When the radio was undergoing this mod at one point I had the response opened up from 1 Hz to 100 KHz! I later bypassed the input to the audio amp to knock the high end down to just below 10 KHz to keep things within reason.

The mod has worked flawless in the 940's as I did about 7 of them for people a decade ago. All switching is done automatically off the mode switch in AM. The only function that is lost is the AM monitor in TX. That could be restored by adding a detector, I just never bothered. The mod is clean, nothing is hacked and it can be easily reversed although you'll never want to. By adding one switch the mod can be switched out on AM to compare the before and after effects of modulating the RF stage or IF stage.

then you obviously havent heard shockwaves kenwood

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