Re: [time-nuts] A Highly-Accurate and Stable SDR-IQ Using GPS-DO and DFS
Indeed the do. I believe its actually a HP3586b a selective level voltmeter. One heck of a reciever measures signals to 100th of a db. As a heads up they have a very good xtal oven in them. I have 5 of these units. Just can not resist them. Often you find these quite cheap. Last one was $20 because it did not work. Well the oven had been taken. Ext ref did just fine. Mine are locked to a Rb standard. Another big caution these have a nicad in them with a resistor for charging. They leak. You need to pull the board and look at it and remove it before powering up. If the leakage has hit the traces, normal. It will raise holy heck and damage the regulators. Clean all the gook and repair any traces and you should be fine. On Fri, Jul 23, 2010 at 11:05 PM, J. Forster j...@quik.com wrote: If you want an HF radio that reads to a Hz, ready made, get a used HP (Agilent) 3486 Selective Level Meter. It covers essentially DC to either 20 or 30 MHz. It has a good internal ovenized oscillator, and can be locked to an external standard. A virtually unique feature is that it will lock onto a carrier and read that carrier frequency to a Hz or better. They are often abailable for a few hundred. The 3486A B are similar. FWIW, -John = I have been involved with many kinds of radio receivers for over fifty years -- amateur, military, and commercial. This modified SDR-IQ is a dream come true. When I was a young ham, I dreamed of the day when I might have a receiver that would read out to one kilocycle (before we used the term Hertz). Now I have assembled one that reads out to one Hertz and is accurate to a few millihertz -- and thanks to GPS -- it will maintain this accuracy as long as the GPS satellites keep working. I well remember the early radios that I used. I had to be very careful to not bump the table where the radio was or it would jump completely off frequency. Whatever frequency it indicated was only approximate. It made me nervous to operate near a band edge. Dave Powis, G4HUP designed and built a 66.6 MHz DFS for me. I really appreciate his help on this project, especially since several hams told me it couldn't or shouldn't be done. Some said that the frequency read-out on the SDR-IQ would not be accurate because the time-base in the computer's sound card would be a variable factor, but this is not true. The frequency accuracy and stability of this radio ONLY depends on the 10 MHz oscillator in the Trimble Thunderbolt and that oscillator is locked to the GPS constellation. Dave and I worked together on this project for about one year. The DFS box travelled across the Atlantic Ocean five times before we finished. Dave has written an article Precise Frequency Locking for the RFSpace SDR radios and I have a web page showing how I connected all of this equipment together. Here are the links: http://www.braddye.com/g4hup_dfs.html http://www.braddye.com/gps_do.html 73s Brad Dye, K9IQY ex KN9IQY, KN4BK, KM5NK, WB4JCF, ZP5TQ, WA4VXU, WA9RVL, HH2FJ /TI2, /9Y4, /6Y5, /KP4 53 years as a FCC licensed amateur radio operator 37 years as a FCC licensed first class commercial radio operator ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A Highly-Accurate and Stable SDR-IQ Using GPS-DO and DFS
Oops. Yes, typo. Sorry. I don't know about the A version but the and C are essentially identical except the B used wierd Telco connectors. An new adapter might cost as much as you'd pay for the receiver. Their shortfall is the demodulation options are limited, but they do a wonderful job of measuring carrier frequency. Best, -John === Indeed the do. I believe its actually a HP3586b a selective level voltmeter. One heck of a reciever measures signals to 100th of a db. As a heads up they have a very good xtal oven in them. I have 5 of these units. Just can not resist them. Often you find these quite cheap. Last one was $20 because it did not work. Well the oven had been taken. Ext ref did just fine. Mine are locked to a Rb standard. Another big caution these have a nicad in them with a resistor for charging. They leak. You need to pull the board and look at it and remove it before powering up. If the leakage has hit the traces, normal. It will raise holy heck and damage the regulators. Clean all the gook and repair any traces and you should be fine. On Fri, Jul 23, 2010 at 11:05 PM, J. Forster j...@quik.com wrote: If you want an HF radio that reads to a Hz, ready made, get a used HP (Agilent) 3486 Selective Level Meter. It covers essentially DC to either 20 or 30 MHz. It has a good internal ovenized oscillator, and can be locked to an external standard. A virtually unique feature is that it will lock onto a carrier and read that carrier frequency to a Hz or better. They are often abailable for a few hundred. The 3486A B are similar. FWIW, -John = I have been involved with many kinds of radio receivers for over fifty years -- amateur, military, and commercial. This modified SDR-IQ is a dream come true. When I was a young ham, I dreamed of the day when I might have a receiver that would read out to one kilocycle (before we used the term Hertz). Now I have assembled one that reads out to one Hertz and is accurate to a few millihertz -- and thanks to GPS -- it will maintain this accuracy as long as the GPS satellites keep working. I well remember the early radios that I used. I had to be very careful to not bump the table where the radio was or it would jump completely off frequency. Whatever frequency it indicated was only approximate. It made me nervous to operate near a band edge. Dave Powis, G4HUP designed and built a 66.6 MHz DFS for me. I really appreciate his help on this project, especially since several hams told me it couldn't or shouldn't be done. Some said that the frequency read-out on the SDR-IQ would not be accurate because the time-base in the computer's sound card would be a variable factor, but this is not true. The frequency accuracy and stability of this radio ONLY depends on the 10 MHz oscillator in the Trimble Thunderbolt and that oscillator is locked to the GPS constellation. Dave and I worked together on this project for about one year. The DFS box travelled across the Atlantic Ocean five times before we finished. Dave has written an article Precise Frequency Locking for the RFSpace SDR radios and I have a web page showing how I connected all of this equipment together. Here are the links: http://www.braddye.com/g4hup_dfs.html http://www.braddye.com/gps_do.html 73s Brad Dye, K9IQY ex KN9IQY, KN4BK, KM5NK, WB4JCF, ZP5TQ, WA4VXU, WA9RVL, HH2FJ /TI2, /9Y4, /6Y5, /KP4 53 years as a FCC licensed amateur radio operator 37 years as a FCC licensed first class commercial radio operator ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] A Highly-Accurate and Stable SDR-IQ Using GPS-DO and DFS
I have been involved with many kinds of radio receivers for over fifty years -- amateur, military, and commercial. This modified SDR-IQ is a dream come true. When I was a young ham, I dreamed of the day when I might have a receiver that would read out to one kilocycle (before we used the term Hertz). Now I have assembled one that reads out to one Hertz and is accurate to a few millihertz -- and thanks to GPS -- it will maintain this accuracy as long as the GPS satellites keep working. I well remember the early radios that I used. I had to be very careful to not bump the table where the radio was or it would jump completely off frequency. Whatever frequency it indicated was only approximate. It made me nervous to operate near a band edge. Dave Powis, G4HUP designed and built a 66.6 MHz DFS for me. I really appreciate his help on this project, especially since several hams told me it couldn't or shouldn't be done. Some said that the frequency read-out on the SDR-IQ would not be accurate because the time-base in the computer's sound card would be a variable factor, but this is not true. The frequency accuracy and stability of this radio ONLY depends on the 10 MHz oscillator in the Trimble Thunderbolt and that oscillator is locked to the GPS constellation. Dave and I worked together on this project for about one year. The DFS box travelled across the Atlantic Ocean five times before we finished. Dave has written an article Precise Frequency Locking for the RFSpace SDR radios and I have a web page showing how I connected all of this equipment together. Here are the links: http://www.braddye.com/g4hup_dfs.html http://www.braddye.com/gps_do.html 73s Brad Dye, K9IQY ex KN9IQY, KN4BK, KM5NK, WB4JCF, ZP5TQ, WA4VXU, WA9RVL, HH2FJ /TI2, /9Y4, /6Y5, /KP4 53 years as a FCC licensed amateur radio operator 37 years as a FCC licensed first class commercial radio operator ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] A Highly-Accurate and Stable SDR-iq Using GPS-DO and DFS
Sorry, I didn't mean to send this message again. Brad Dye, K9IQY ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] A Highly-Accurate and Stable SDR-IQ Using GPS-DO and DFS
If you want an HF radio that reads to a Hz, ready made, get a used HP (Agilent) 3486 Selective Level Meter. It covers essentially DC to either 20 or 30 MHz. It has a good internal ovenized oscillator, and can be locked to an external standard. A virtually unique feature is that it will lock onto a carrier and read that carrier frequency to a Hz or better. They are often abailable for a few hundred. The 3486A B are similar. FWIW, -John = I have been involved with many kinds of radio receivers for over fifty years -- amateur, military, and commercial. This modified SDR-IQ is a dream come true. When I was a young ham, I dreamed of the day when I might have a receiver that would read out to one kilocycle (before we used the term Hertz). Now I have assembled one that reads out to one Hertz and is accurate to a few millihertz -- and thanks to GPS -- it will maintain this accuracy as long as the GPS satellites keep working. I well remember the early radios that I used. I had to be very careful to not bump the table where the radio was or it would jump completely off frequency. Whatever frequency it indicated was only approximate. It made me nervous to operate near a band edge. Dave Powis, G4HUP designed and built a 66.6 MHz DFS for me. I really appreciate his help on this project, especially since several hams told me it couldn't or shouldn't be done. Some said that the frequency read-out on the SDR-IQ would not be accurate because the time-base in the computer's sound card would be a variable factor, but this is not true. The frequency accuracy and stability of this radio ONLY depends on the 10 MHz oscillator in the Trimble Thunderbolt and that oscillator is locked to the GPS constellation. Dave and I worked together on this project for about one year. The DFS box travelled across the Atlantic Ocean five times before we finished. Dave has written an article Precise Frequency Locking for the RFSpace SDR radios and I have a web page showing how I connected all of this equipment together. Here are the links: http://www.braddye.com/g4hup_dfs.html http://www.braddye.com/gps_do.html 73s Brad Dye, K9IQY ex KN9IQY, KN4BK, KM5NK, WB4JCF, ZP5TQ, WA4VXU, WA9RVL, HH2FJ /TI2, /9Y4, /6Y5, /KP4 53 years as a FCC licensed amateur radio operator 37 years as a FCC licensed first class commercial radio operator ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
