I was using it in an early simulator that did not have an FFT. BTW I got an "Easter egg" from one of the HP techs to disable autocal which allowed me to set up TEF on their 20Hz - 20Mhz analyzer which had a 3Hz wide crystal IF filter that you could offset from the LO. It worked quite well though the speaker project was a waste of time.
Howie you made me laugh. Back in 1971 I was working on an X-ray astronomy package for a balloon flight that sent telemetry data down to a Kennedy R2R data recorder (IIRC 7000' reels at 11/16 ips.). After the first test flight one of the programmers came and complained that I left off the EOF so her program tried to read the whole tape.
EOFs / Internet audio links
Scott,
I also had EOF issues transferring data from Gov't 8mm to DVD...weirdly placed or missing EOFs...had to manually reassemble some data sets based on framing alone. We transferred 10s of 1000s of these Exabytes to DVD...my biggest challenge was creating a manual and training operators to do the data reformatting.
I guess we have talked it all out, no mysteries left to solve in audio? I have been uber busy supporting the radio stations I am contracted with as they continue operations from remote locations with studios virtually vacated. This has done nothing but reaffirm my opinion of the internet as a really lousy audio conduit. I have 5-15 second buffers set up for almost all links and still see burstiness and latency exceeding this in some cases.
I love my microwave links! Virtually 100% uptime and milliseconds of latency...for $10k+...you get what you pay for.
Take care folks...
Howie
Scott,
I also had EOF issues transferring data from Gov't 8mm to DVD...weirdly placed or missing EOFs...had to manually reassemble some data sets based on framing alone. We transferred 10s of 1000s of these Exabytes to DVD...my biggest challenge was creating a manual and training operators to do the data reformatting.
I guess we have talked it all out, no mysteries left to solve in audio? I have been uber busy supporting the radio stations I am contracted with as they continue operations from remote locations with studios virtually vacated. This has done nothing but reaffirm my opinion of the internet as a really lousy audio conduit. I have 5-15 second buffers set up for almost all links and still see burstiness and latency exceeding this in some cases.
I love my microwave links! Virtually 100% uptime and milliseconds of latency...for $10k+...you get what you pay for.
Take care folks...
Howie
Audio is engineering based, thus deterministic. My understanding is that - psychoacoustics aside - it’s the fallacies left to be cleared.
I spend more and more night time on MW/SW AM listening.
George
"I spend more and more night time on MW/SW AM listening."
thanks George, learn something new every day
dennis h
thanks George, learn something new every day
dennis h
"I happen to believe that a major purpose of technical audio measurements is to assist in creating better subjective perception, and if that's not happening, then we are getting nowhere with the objective measurement."
A rewrite;
I happen to believe that a major purpose of technical audio measurements is to assist in creating better subjective perception; and if that has clear limitations currently, then we need to either improve them - or look elsewhere to account for such perceptions.
The actual quote seems to have an urgency to "close the book" on technical audio measurement. Then what, leave it all up to to time and instance variant human systems? The salesman's dream - "Dont worry, if you're a true audiophile, you'll definitely hear the difference tomorrow!"
A rewrite;
I happen to believe that a major purpose of technical audio measurements is to assist in creating better subjective perception; and if that has clear limitations currently, then we need to either improve them - or look elsewhere to account for such perceptions.
The actual quote seems to have an urgency to "close the book" on technical audio measurement. Then what, leave it all up to to time and instance variant human systems? The salesman's dream - "Dont worry, if you're a true audiophile, you'll definitely hear the difference tomorrow!"
Despite protestations to the contrary, I know all the designers here design based on firm engineering principles and the tweaks are well...their calling card.
I have also spent more time listening to radio, although it is to my local WXYC FM
Now we are remotely programmed and have an AutoDJ which between Live DJs pulls tracks from two sources: a playlist set up by the DJs and a Freeform library I set up and loaded over 2000 tracks into (and I'm only 25% done). Given the generes the station plays I had to limit it to jazz/rock/electronic/cosmiche/zeuhl, etc.
The result is there are long periods where it is (to my taste of course) an excellent freeform station...a personal Pandora if you will, if you must...although I wish you wouldn't.
Cheers!
Howie
Riding on the waves to Far East (till they fade away) 🙂
Dropbox - HDSDR_20200517_205852Z_6020kHz_AF.wav - Simplify your life
George
Attachments
Work has been busy for me, and yes the internet sucks for anything that needs latency controlled unless you pay the big bucks. At least with an E1/T1 line you had the bandwidth allocated to you and only you (mostly and it had other issues).
In the small amounts of free time work and kids have allowed I've been musing over experiments to try to optimise playback of mono LPs. Whilst I have no shellac I've a few of well abused mono recordings. What I have discovered is that I was completely wrong about one of my assumptions and that there are some cases where using a stereo cartridge to play a mono groove is better. Meantime lots of experimenting to do and general pointless fun 🙂
I can't tell you how many hours I've spent doing this, from 1963 on on my father's Transoceanic. Now I have a Kaito all band and it's not bad. Nothing quite beats being out in the ocean listening to American bible belt preachers on a super-regen, do you get any of these? They must be in rare form these days.
There is a thread in the analog source forum. I hope you will join and share your experiences 🙂
Scott, it’s 1:30AM here, I hear one loud and clear at 5.9MHz now. During the next 3-4 hours, there will be some ten more USA religious stations to be received here.
They also transmit through satellites to ground AM repeaters all over the globe.
George
Thanks Bill, I found it
Fun with mono
I will read it.
No recent serious experimentation with mono vinyl setup on my part. 🙂
George
George, does your SDR work with HDSDR? You may not need the transmit functionality, but it gives front-panel type access to a lot of SDR functions.
I use it with the couple of SDRs I have here as well as the Elecraft KX3 SDR Transceiver.
Cheers!
Howie
What is rare, the preachers or the super regens?
When I was still at school, there was a ham who operated the local 144 MHz repeater
and he was accused by a neighbour to generate RFI. The neighbour called the
measurement service of our FCC equivalent, they came with their yellow van, built up
their directive antennas, switched on the test receivers and scratched their heads.
Then they sacked the neighbour's super regeneration receiver. The people in the
street learned from this: Complaining at the FCC's is dangerous. They might take away
our radios!
Cheers, Gerhard
Sorry I guess that does not translate, it's used to describe more extreme than usual. I expect the preachers are blaming the virus on any number of things the discussion of which would violate forum rules.
Locally listening the dropouts seem to depend on the DJ, leading me to assume it is the uplink. Not the good old days where THE telephone company provided broadcast loops and if there was a problem it got fixed as fast as possible.
In stadium systems these days all audio transport is Internet Protocol. The consultants save money by specifing 1Gb routers and sharing the fiber/cable backbone. This can add as much as $50,000 worth of gear to the system prices. Never less than $20,000. They like the fact that they no longer have the "ground loop" problems. Of course I am still seeing them specify copper ground busses in every rack. They must be trying to get that hum and buzz back in.
So lowest cost would be balanced copper shielded cable with audio isolation transformers. Next would be a true local area network with increadably cheap 100M switches.
Of course with a 1-10 gig fiber network it will work until they run video over it. Of course all of the 600 or so televisions in the joint are now IP based. No more cable based rf distribution.