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 <[email protected]> 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 66.66666 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 -- [email protected] >> > To unsubscribe, go to >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> > >> > >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
