Re: Topband: ADC Overload from MW transmitters

<< What do we do with them?>> We do what we are! Gentlemen !giving always a good example. Even almost 40 year later worth reading W1BB. W1BB>> GENTLEMENT BAND!!??? ---Shall stress the importance of keeping this UNIQUE band "The GENTLEMEN! Band", as its reputation has been for so many

Re: Topband: ADC Overload from MW transmitters

Thank you for posting that JC ! I have never read that before and it is very appropriate. Rich K7ZV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of JC Sent: Friday, October 23, 2015 5:58 AM To: 'topband' Subject: Re: Topband: ADC Overload from MW

Re: Topband: ADC Overload from MW transmitters

Great advice indeed. On Fri, Oct 23, 2015 at 7:57 AM, JC wrote: > The BEST WAY to handle them is TO PAY NO ATTENTION WHATSOEVER NOT EVEN > MENTION it or them ... The WORST thing to do is to TAKE NOTICE of them, > talk about them, call them names, retaliate, etc.

Topband: ADC Overload from MW transmitters

Thanks for the reminder JC.    Remember. 160 meters was not included in most ham gear not so long ago. It's a gift we should treasure.   73 Bruce-k1fz   BOG antenna notes have been updated at a new address.   www.qsl.net/k1fz/bogantennanotes.html     On Fri, 23 Oct 2015 08:57:38 -0400,

Re: Topband: ADC Overload from MW transmitters

M SPAM ... (with a guys voice trying to sound like a old > > woman) Flying Circus any one? > > > > > >> From: bayc...@mediacombb.net > >> To: patriot...@msn.com; topband@contesting.com > >> Subject: Re: Topband: ADC Overload from MW transmitters &g

Re: Topband: ADC Overload from MW transmitters

t see that structure ... > > Id like to know what SDR was so poor. > > > > SPAM SPAM SPAM SPAM ... (with a guys voice trying to sound like a old woman) Flying Circus any one? > > > > > >> From: bayc...@mediacombb.net > >> To: patriot...@msn.com; topban

Re: Topband: ADC Overload from MW transmitters

I guess it was a SDR-1000 or Flex5000 73 Peter -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MIKE DURKIN Sent: Dienstag, 20. Oktober 2015 08:08 To: topband@contesting.com Subject: Re: Topband: ADC Overload from MW transmitters Come on Bill

Re: Topband: ADC Overload from MW transmitters

>> From: bayc...@mediacombb.net >> To: patriot...@msn.com; topband@contesting.com >> Subject: Re: Topband: ADC Overload from MW transmitters >> Date: Tue, 20 Oct 2015 00:52:15 -0500 >> >> Mike-- >> It is obvious that you do not know who Tom is. >> and--

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

<vk...@arach.net.au> To: <topband@contesting.com> Sent: Monday, October 19, 2015 8:07 AM Subject: 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

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

Re: Topband: ADC Overload from MW transmitters

On Mon, 10/19/15, Tom W8JI <w...@w8ji.com> wrote: Subject: Re: Topband: ADC Overload from MW transmitters To: topband@contesting.com Date: Monday, October 19, 2015, 10:58 AM I think the problem here is some people read this as a SDR radios

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

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: 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

by almost anyone .. check it out, if not again. Not sure if i should really send this .. but, what the hell. > From: bayc...@mediacombb.net > To: patriot...@msn.com; topband@contesting.com > Date: Mon, 19 Oct 2015 17:41:41 -0500 > Subject: Re: Topband: ADC Overloa

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

@contesting.com Subject: 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

Re: Topband: ADC Overload from MW transmitters

complicated. - Original Message - From: "bruce whitney" <zuce...@yahoo.com> To: <topband@contesting.com>; "Tom W8JI" <w...@w8ji.com> Sent: Monday, October 19, 2015 11:59 AM Subject: Re: Topband: ADC Overload from MW transmitters This has been an i

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

Topband: ADC overload from MW transmitters

G’day For those topbanders, who have medium wave stations nearby and are thinking about trying a DDC/DUC SDR, you may find the comments below from Phil VK6APH/VK6PH (in answer to a query on the Apache Labs reflector a few years ago) of interest. Phil lives line of sight from the Australian

Re: Topband: ADC overload from MW transmitters

On Sun,10/18/2015 8:59 PM, Steve Ireland wrote: Phil lives line of sight from the Australian Broadcasting Transmitter installation in the northern suburbs of Perth. There are three AM transmitters there which run 24 hours a day, seven days a week: 6PB at 10 kW on 585 kHz; 6RN at 20 kW on 810

Topband: ADC Overload

I always marveled with my TT Orion 1, before I died, on SSB when a very strong signal was on frequency that often a weak one would stand out in the noise suppressed band. Never found out if this was from the DSP or earlier analog string. N0UU _ Topband Reflector Archives -

Re: Topband: ADC Overload

I have used Orions and agree, the NR (not noise blanker) is remarkably effective for marginal, below the noise level, signals on SSB. This was definitely DSP techniques. Other more modern DSP rigs (e.g. K3, Eagle) do not have that exact feature in their DSP. I'm not saying that K3 and Eagle DSP

Re: Topband: ADC Overload

It might be a matter of terminology, but the technique actually involves RAISING the AGC Threshold so that gain compression only kicks in on the strongest signals and there's a linear gain curve for everything below that level. From s1 to s9 is a delta of ~48dB, so a full implementation of K3NA's

Re: Topband: ADC Overload

Perhaps an alternative analogy would be helpful here... Each of the many signals can be imagined as its own phasor. One end of the phasor is anchored on the origin (0 V) and the other is spinning around the origin at the frequency of the signal with a length equal to its amplitude. Since the

Re: Topband: ADC Overload

Yes, *raise* the trigger threshold. tnx Mike / W5JR Alpharetta GA > On Oct 14, 2015, at 5:44 AM, Barry N1EU wrote: > > It might be a matter of terminology, but the technique actually involves > RAISING the AGC Threshold so that gain compression only kicks in on the >

Re: Topband: ADC Overload

Thanks Mike for explaining the context! I've done extensive weak signal listening with an Apache Labs ANAN-100D (DDC SDR running OpenHPSDR software/firmware) compared with a slew of highly regarded analog and hybrid (dsp i.f.) receivers and if anything, the SDR betters them slightly. My

Re: Topband: ADC Overload

​I though your original post was excellent, Jim, and right on the money.​ On Tue, Oct 13, 2015 at 1:29 PM, Jim Garland <4cx2...@miamioh.edu> wrote: > Having said that, here's the fly in the ointment. There are several > assumptions buried in the Central Limit Theorem, so its validity isn't as >

Re: Topband: ADC Overload

W8ZR > -Original Message- > From: James Wolf [mailto:jbw...@comcast.net] > Sent: Monday, October 12, 2015 9:45 PM > To: 'Jim Garland' > Cc: topband@contesting.com > Subject: RE: Topband: ADC Overload > > Jim, > > I sense a flaw in the CLT argument, which is

Re: Topband: ADC Overload

On Tue, Oct 13, 2015 at 8:26 PM, Stephen Hicks, N5AC wrote: > > The only AGC that exists is to map the total dynamic range (in excess of > 100dB) into the available "comfortable" dynamic range of your ear (the ear > has a total dynamic range of something around 130dB, but

Re: Topband: ADC Overload

That's exactly how I set mine up. Lower the AGC-T to where the band noise and weak/moderately weak signals aren't hitting the threshold. So maybe S4-5+ signals do hit the threshold. I'm able to still hear the "at noise floor" signals without pain in the ears from strong signals. They're loud,

Re: Topband: ADC Overload

On Tue, Oct 13, 2015 at 3:56 PM, Barry N1EU wrote: > But my main > point here is that a high end xcvr vendor should hopefully not hamstring > the receiver AGC with a lower dynamic range and prevent such techniques. > > Thanks for listening & 73, > Barry N1EU > ​You can

Re: Topband: ADC Overload

>"The favorable SDR averaging doesn't apply when the RF voltage at the receiver >input is dominated by one huge signal, and if that signal exceeds the >capability of the ADC in the radio, overload can definitely occur. So, >although I believe that nearly all manufacturers will soon migrate to

Re: Topband: ADC Overload

] On Behalf Of Stephen > Hicks, > N5AC > Sent: Sunday, October 11, 2015 9:24 AM > To: topband@contesting.com > Subject: Topband: ADC Overload > > Rick, > > I hope it's not an issue for me to post here directly. I am posting here > because I believe that amateur r

Re: Topband: ADC Overload

Then what if we *deliberately* inject hundreds, if not thousands of discrete RF carriers into our SDR receivers from say...an internal RF carrier or noise generator, mixed with the desired RF signal to mitigate OL caused by a few strong carriers? It would be interesting to see the math and

Re: Topband: ADC Overload

Hi Guys It's well know the ability to copy weak signal near strong carriers. I run a QS1R using HDSDR all the time shearing the same RX antenna with my IC7800. In the last 10 years only once I worked a new country on 160 listening on the SDR that I was not able to copy using the IC7800. David

Re: Topband: ADC Overload

On Mon, Oct 12, 2015 at 10:28 PM, Mike Waters wrote: > But as a recent thread here* established, there is *NO* SDR that can > perform as > well as a good ear-brain combo for copying the very weakest of signals > buried in the noise. Maybe someday, but the future has not

Re: Topband: ADC Overload

Hi Barry, Thanks for your input. Yes, I believe we included direct sampling digital receivers (SDR) versus superhet receivers. The post I made here today is not complete; rather that re-post everything, I included a link to the early August discussion, which explained in detail what I meant.

Re: Topband: ADC Overload

An SDR is better for several things, yes. One advantage is that near-perfect extremely narrow filters can (and do) exist in software. But as a recent thread here* established, there is *NO* SDR that can perform as well as a good ear-brain combo for copying the very weakest of signals buried in the

Re: Topband: ADC Overload

sting.com] On Behalf Of > Stephen Hicks, N5AC > Sent: Sunday, October 11, 2015 9:24 AM > To: topband@contesting.com > Subject: Topband: ADC Overload > > Rick, > > I hope it's not an issue for me to post here directly. I am posting > here because I believe that a

Topband: ADC Overload

Rick, I hope it's not an issue for me to post here directly. I am posting here because I believe that amateur radio has a huge educational component and ultimately incorrect information services no one. I got started when I was 12 and really knew very little about the hobby. My journey, like

Re: Topband: ADC Overload

I hope it's not, too. :-) SDR fascinates me, and I intend to experiment with the technology on 160 meters starting with a Softrock Xtall Lite 9.0 and the matching switchable BPF. 73, Mike www.w0btu.com On Sun, Oct 11, 2015 at 10:23 AM, Stephen Hicks, N5AC wrote: > > I