Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
I agree with that. I have an HP 3586A Selective Voltmeter and it has the LO output on the rear which covers 0-32 MHz. I wish there was a programmable attenuator on this output as it is exceptionally clean spectrally. Of course, there is no modulation capability. Didier KO4BB Magnus Danielson wrote: ... The only thing which annoys me is that it doesn't go higher in frequency and that I wish I could run the modulation source internally even if I like the contacts at the back. If you don't get the modulation source to do anything reasnoble, check if you have hooked up a cable! Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
At 05:14 AM 7/12/2006, you wrote: I agree with that. I have an HP 3586A Selective Voltmeter and it has the LO output on the rear which covers 0-32 MHz. I wish there was a programmable attenuator on this output as it is exceptionally clean spectrally. Of course, there is no modulation capability. What about a 3336(A, B, C)? Although the attenuator is only on the 21MHz output, but if you can get one with option 5 it is a beautiful low noise modulatable source with an outstanding attenuator. John Didier KO4BB Magnus Danielson wrote: ... The only thing which annoys me is that it doesn't go higher in frequency and that I wish I could run the modulation source internally even if I like the contacts at the back. If you don't get the modulation source to do anything reasnoble, check if you have hooked up a cable! Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
Seems like a lot of money to pay for one. I have been using an HP 3325A for about 25 years and like it very much. I bought it brand new from HP for the company I worked, where I was director of engineering. After I resigned, to pursue greener pastures, they eventually closed down their hardware capability and operations and offered me the entire laboratory and inventory which then I purchased personally. I would recommend you getting the A version for about one fifth of the price of that B model, unless, you have an overwhelming desire to get the B for some special reason. Option 001 provides the high accuracy ovenized reference and it does not look like the one on ebay has that option. Normally they would use a TCXO. Regardless, since you will be using an external reference it really does not matter. The A also accepts an external reference and I run my off of a local Rubidium. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of xaos Sent: Tuesday, July 11, 2006 9:11 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol Hello everyone, I found this HP3325B Function Generator on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=270006696082 It has the high voltage option but not the High Stability Oven. Since I plan to use an external GPS based frequency source, does it matter? I suspect the unit still has a decent ovenized crystal to begin with. Any thoughts from the group? -George Hrysanthopoulos, N2FGX ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.10/383 - Release Date: 7/7/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.10/384 - Release Date: 7/10/2006 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
I've always been curious about the 3325A vs. B -- there is more price spread between those two than just about any other HP A vs. B model. What's the difference between them, and is it worth anything like that much (obviously, Mike doesn't think so :-) ). I've been happy with my A model, though it often fails amplitude calibration on powerup. Waiting a few seconds and then running the cal always works, though. John Mike Feher wrote: Seems like a lot of money to pay for one. I have been using an HP 3325A for about 25 years and like it very much. I bought it brand new from HP for the company I worked, where I was director of engineering. After I resigned, to pursue greener pastures, they eventually closed down their hardware capability and operations and offered me the entire laboratory and inventory which then I purchased personally. I would recommend you getting the A version for about one fifth of the price of that B model, unless, you have an overwhelming desire to get the B for some special reason. Option 001 provides the high accuracy ovenized reference and it does not look like the one on ebay has that option. Normally they would use a TCXO. Regardless, since you will be using an external reference it really does not matter. The A also accepts an external reference and I run my off of a local Rubidium. 73 - Mike ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
Hi John: It's my recollection (and so subject to bad memory) that the 3325's claim to fame is that the amplitude is settable in steps of 0.01 dB. Also the amplitude accuracy is very good. Because of this the 3325 is still called out as part of the required test equipment needed to calibrate other test instruments. The A model uses mechanical attenuators that wear out and the B model uses some more reliable attenuation scheme. Once the A model breaks it's toast. Since they are still needed for doing calibrations the demand for the more reliable B model is driving up the price. http://www.tucker.com/images/images_spec/0015.pdf Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com John Ackermann N8UR wrote: I've always been curious about the 3325A vs. B -- there is more price spread between those two than just about any other HP A vs. B model. What's the difference between them, and is it worth anything like that much (obviously, Mike doesn't think so :-) ). I've been happy with my A model, though it often fails amplitude calibration on powerup. Waiting a few seconds and then running the cal always works, though. John Mike Feher wrote: Seems like a lot of money to pay for one. I have been using an HP 3325A for about 25 years and like it very much. I bought it brand new from HP for the company I worked, where I was director of engineering. After I resigned, to pursue greener pastures, they eventually closed down their hardware capability and operations and offered me the entire laboratory and inventory which then I purchased personally. I would recommend you getting the A version for about one fifth of the price of that B model, unless, you have an overwhelming desire to get the B for some special reason. Option 001 provides the high accuracy ovenized reference and it does not look like the one on ebay has that option. Normally they would use a TCXO. Regardless, since you will be using an external reference it really does not matter. The A also accepts an external reference and I run my off of a local Rubidium. 73 - Mike ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
Here's one that sold for $102 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=31869022 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol
From: John Ackermann N8UR [EMAIL PROTECTED] Subject: Re: [time-nuts] HP 3325B Function Generator and GPS based frequencycontrol Date: Tue, 11 Jul 2006 10:39:49 -0400 Message-ID: [EMAIL PROTECTED] I've always been curious about the 3325A vs. B -- there is more price spread between those two than just about any other HP A vs. B model. What's the difference between them, and is it worth anything like that much (obviously, Mike doesn't think so :-) ). The B model adds modulation source if I recall correctly. I have the B model but also has some of the A documentation. However, I can't check the details from here (600 km between me and the manuals). I would not add too much money on the B model compared to the A model. It's nice but not strictly necessary. The High Voltage option is nice, but if you are a true time-nut the 001 ref doesn't add much since you already as a nice ref heated. The only thing which annoys me is that it doesn't go higher in frequency and that I wish I could run the modulation source internally even if I like the contacts at the back. If you don't get the modulation source to do anything reasnoble, check if you have hooked up a cable! Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
