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Mike and all, there must be quite a different scheme when trying to reducing Lightning storm “static” as opposed to very local noise or nearby bad power line noise, or your own light dimmer noise.

Richard , do you drive your engine at one speed? Sent: Sunday, June 9, 2024 9:16 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-117 noise limiter behavior Well, you are

Well my own contribution to this is spring, 1967, I owned a 1963 Austin-Healey Sprite Mark II (not the 'Bug Eye' one).....948cc engine.....needed to be rebuilt, so one night after work I pulled it,

OK – have fun. 73 – Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 Sent: Sunday, June 9, 2024 10:23 PM To: [email protected] Subject: Re: [HallicraftersRadios]

I am seeing a picture in my mind of a kitchen with motorcycle parts all over. Smells strongly of gasoline and kerosene. I don't remember where this comes from. Some low life I once had as friends

It IS periodic, not random. Each noise pulse has a definite signature. It is well above average random noise. A noise blanker of any sort desensitizes the signal channel during the noise pulse. In

Tom, Kinda like rebuilding a carburetor on the kitchen table! LOL Bob W4JFA [email protected]> wrote:

Rich – Ignition noise is far from periodic. It may approach that at a constant speed, and may be somewhat predictable in the same vehicle where the receiver is. An SX117 for example and most others

True, but a good approximation of the noise in the vicinity of the receiver antenna can be sampled and used to reduce the noise coming in along with the desired signal from the main antenna. The noise

Well, you are speaking of _random_ noise, like natural radio noise but blankers are intended to work on periodic signals such as ignition noise. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

I believe the Collins used this technique for the NB on the 75S and 51S receivers. Should really look. It has the advantage of a very wide band input. For ignition and other pulse noise the NB

And I wonder how many of them, *if married*, are no longer with us ??? hahahahaha Tom Latimer

It seems to me, that since noise is neither correlate-able or stochastic, elimination is not possible. Also the multiple antenna theory is out the window since RF generated noise travels at the speed

Another technique for reducing or eliminating noise was to introduce local noise to the front end of a receiver from a local "noise antenna." The amplitude and phase of that noise could be adjusted

There are some, who put entire chassis in the dishwasher as long as components like transformers and/or coils are removed. From our file department. *K2WH Bill's QRZ Biography (

Can't read the whole book:-) Look at any of the classical receivers, say a Hallicrafters S-40. That has a series diode noise limiter. I think the S-20R has a shunt limiter. Series limiters began to

Back to noise? stuff only Richard you say halli used a ?Noise ?LIMMITER ?, not a blanker? but it is an “unusual noise limiter arrangement” Is there a standard arrangement? And what is it?

I didn't believe it, till I used it, but for cleaning radios... chassis and all - "Scrubbing Bubbles"? works swell. TriFlo teflon lube is good for breaking loose Pot and Variable Cap shafts... a tiny

Well, that's useful to know. Actually, I have some Kroil, my local hardware store just began to stock it along with gun cleaning stuff. I agree that recommendations for cleaning based on experience

Anyone have an SX series S meter they wish to part with? SX99 I am working with needs one replaced. Plastic face is broken and cracked badly. thanks keith