Re: Topband: ADC Overload from MW transmitters

Hi Jim Clearly in a large US city, there is going to be a whole larger degree of difficulty than here. Perth is still pretty much a small city in world terms, with a population of about 2 million. In addition to the ABC transmitters, we have about half a dozen other transmitters, but only

Re: Topband: ADC Overload from MW transmitters

I think the problem here is some people read this as a SDR radios never overload, or are superior in every case. Apparently one person thought they were junk because multiple modest strength signals would add up to overload them, and that triggered the response that was misinterpreted to mean

Re: Topband: ADC Overload from MW transmitters

SPAM !! > From: w...@w8ji.com > To: topband@contesting.com > Date: Mon, 19 Oct 2015 10:58:44 -0400 > Subject: Re: Topband: ADC Overload from MW transmitters > > I think the problem here is some people read this as a SDR radios never > overload, or are superior in every case. > > Apparently

Re: Topband: ADC Overload from MW transmitters

This has been an interesting discussion. I heard a rumor that a very prominent and successfully competent multi-multi contester in IL was going to an all SDR multiple computer control set-up. Which would seem to be problematic in light of this discussion? Anyone else hear this? Bruce W8RA

Re: Topband: ADC Overload from MW transmitters

I'm still of the opinion --right or wrong-- that there will *always* be hams using analog technology that will be able to out-hear anyone using an SDR (even DDS) to copy very weak CW signals at the low end of 160. *But I have an open mind.* I think it was Barry N1EU that disagreed with me on that

Re: Topband: [Bulk] Re: ADC Overload from MW transmitters

Not having any particular axe to grind, I'll pile on a bit with some comments. 1. The superhet/SDR vs direct sampling radio manufacturer and technology competition is and will continue to be very good for the ham community. 2. The early days of CD audio yielded, "I can't stand the sound"

Re: Topband: ADC Overload from MW transmitters

I'm still of the opinion --right or wrong-- that there will *always* be hams using analog technology that will be able to out-hear anyone using an SDR (even DDS) to copy very weak CW signals at the low end of 160. *But I have an open mind.* I think it was Barry N1EU that disagreed with me on that

Re: Topband: ADC Overload from MW transmitters

-Original Message- From: MIKE DURKIN Sent: Monday, October 19, 2015 10:47 AM To: topband@contesting.com Subject: Re: Topband: ADC Overload from MW transmitters SPAM !! Mike-- Can you explain this opinion? In my experience, almost anything Tom takes the trouble to publish is well

Re: Topband: [Bulk] Re: ADC Overload from MW transmitters

This is not true- higher sample rates are just as effective in reducing overload as higher bit resolution. The higher sample rates reduces the probability of multiple signals happening at the same time and overloading the ADC. In addition, the higher rate allows for capturing smaller

Re: Topband: ADC Overload from MW transmitters

On 10/19/2015 11:59 AM, bruce whitney via Topband wrote: This has been an interesting discussion. I heard a rumor that a very prominent and successfully competent multi-multi contester in IL was going to an all SDR multiple computer control set-up. Which would seem to be problematic in light

Re: Topband: ADC Overload from MW transmitters

Rudy Bakalov via Topband wrote: > This is not true - higher sample rates are just as effective in > reducing overload as higher bit resolution. ... > The higher sample rates reduces the probability of multiple signals > happening at the same time and overloading the

Re: Topband: ADC Overload from MW transmitters

If i must Tom never mentioned what type of SDR would be wiped out by moderate signals ... That in its self has three problems ... NO filtering? (should this be called -- comparing apples to apples, not apples to turds) poor ADC (real cheap soundcard 8bit)? insanely bad phase error in

Re: Topband: ADC Overload from MW transmitters

On Mon,10/19/2015 10:07 PM, MIKE DURKIN wrote: Tom never mentioned what type of SDR would be wiped out by moderate signals ... Tom cited an SDR wiped out by a VERY STRONG IN-BAND local signal. 73, Jim _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: ADC Overload from MW transmitters

Mike-- It is obvious that you do not know who Tom is. and-- the word SPAM followed by six exclamation points IS an expletive. also-- I did not put forth any opinion about ADC or SDR. Bill--W4BSG -Original Message- From: MIKE DURKIN Sent: Tuesday, October 20, 2015 12:07 AM To:

Re: Topband: ADC Overload from MW transmitters

If there is one transmitter per band and no duplex, I think it would work fine. (If you can get old timers to use knobless radios.) External filters would easily correct any problems. The issue is duplex on one band at high local signal levels, where an external filter would be much too

Re: Topband: ADC Overload from MW transmitters

Does that mean "don't bother me with facts, I've made up my mind?" Tom presented his experience. He's a damn good engineer, so we should pay attention to it. Much earlier in this thread, I observed that most serious contesting stations using more than one transmitter will have bandpass