Thanks for the info Stan. Yes, I have it all figured out now and even found the old cabinet/chassis I used to have it in. I have had it running now for over 24 hours, with the EFC pot set so it reads exactly 5.000000000 MHz on my 5345A with a 10 second gate. The 5345A uses a Rubidium for a reference. All of the metering functions work. I really wonder if one is willing to wait a half hour or so, in a room temperature environment, if the quick heater is worth the effort. Opinions are welcome. Like I said. Even with only 40 volts DC on it, as a quick check, I found it to shut off in about 20 or so minutes. I expect with 120 VAC it will shut off much quicker. I found my 10811A/B manual, but still no luck on the 105A manual. I know I have it here someplace. I'll probably find it when I am not looking for it. Regardless, since you offered, I'll buy your manual for $25 plus shipping. Let me have your address, and the total, so I can get out a check. Thanks - 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 Stan Searing Sent: Sunday, February 12, 2006 12:04 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP 00105 oscillator It sounds like you have it figured out. The quick heater is 115 VAC. For 230 VAC connections, 115 VAC is derived from one of the two windings of the power transformer. The other power inputs are 24 and 18.7 VDC. The +24 VDC is the proportional oven supply and oven driver supply. The +18.7 VDC (also marked +20 on the schematic) runs pretty much everything else (the oscillator runs from 6V regulated from the 18.7, while the oven controller, the AGC and the output amp run from 18.7). Yes, there is a 15 VDC low current output that is regulated from the 18.7 and is intended for the fine EFC potentiometer that drives the +EFC pin. And yes, there is a meter output from the oven (the oven heater voltage is 24V minus the voltage on this pin, so the lower the voltage on this pin, the harder the oven is being driven). And finally there is a 5 MHz output (separate from the coax output) for the HP 105 dividers that generate 1 MHz and 100 kHz. I have a couple dead 105's. I think that the ribbon cable inside the oven melted and shorted on one (taking the power supply with it). I'm not sure what happened to the other, but I'd like to fix is someday, so if you find other failure modes, I'd appreciate knowing about them). I have an extra manual; $25 plus shipping ($15 plus shipping if you can get Agilent's permission to put it on the web, and you agree to scan it and make it available on the web). Or you can borrow it to copy/scan if you want to pick-up and drop-off in San Jose. The 105-6012 schematic is in another manual I have. Looks pretty similar, the AGC board (and maybe the external connections) are a little different. Stan -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Feher Sent: Saturday, February 11, 2006 6:25 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP 00105 oscillator Horst - Well, have a good night rest. I did bring one of my oscillators upstairs, into my lab. The oscillator that is not in pieces. Managed to get it to play right away. Some of it is coming back to my memory and I believe there are two ovens. One is a proportionately controlled oven run by the 24 volts, and the other is a quick oven to get things up to temperature. I am convinced that the two Teflon connectors are for the quick oven which is controlled by a thermostat. I put 40 volts on mine and it only drew about 200 ma, but, it automatically shut off after about 1/2 hour. So, it seems like it may be working. I believe the terminal marked 15 Volts is a regulated output in case you want to use it with the EFC inputs through an external multi-turn potentiometer. The output marked "M" I believe is to monitor the oscillator status. I tried to replicate the old HP 105 oscillator with my oscillator assembly and had a meter and a 10 turn pot on the front panel along with a meter selector switch. I'll try and find the old 105 manual, as I know I have it someplace. Regards - 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 A.H.Schmidt Sent: Saturday, February 11, 2006 8:50 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] HP 00105 oscillator Hi Mike, thanks for your replay. I actually have the oscillator going since a couple of weeks. I connected 24V for the oven and 20 V for the oscillator. There is also a 15V connection, I have no idea what for and the 2 connections on the other end which I also don,t know what it is for. The voltage control inputs are SMC connections, (I suppose for low noise) but there are separate + an _ connections. I left them open and adjusted the frequency with the course frequency control only. I am comparing the frequency to a home build receiver for TV line frequencies, Phase locket to give me 10 and 5MHz output. According to the TV station CH9 in Melbourne, they are locket to a Cesium standard. I can compare the frequency to 9 digits and it hasn't moved even 1 digit with Varying temperatures of about 18 Deg C to 38 Deg C (In my Garage). I am really keen to build this unit in to a box and multiply the output by 2 to get 10MHz. However I wait, until I have all the information on the connections. Thanks again for the speedy replay. I am going to bed now, It is 1/4 to 1 O'Clock in the morning. _______________________________________________ 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 _______________________________________________ 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