Re: [time-nuts] HP5334A Option 010 replacement connector J8
I was the Project Manager for the 5334B. The A version (unlike the B version) has a very weak power supply due to insufficient capacitors and/or transformer. I can't remember now after 25 years. When you power it up with a cold 10544 or 10811, the oven circuit looks like a 47 ohm resistor. The 5334A can only muster 12V into this load. This is way below the 20V minimum operating voltage. However, the 10811 turns out to work well enough on 12V to get the oven warmed up. Once the oven current cuts back, the voltage will zoom up to something like 24V, being unregulated. This passes for "normal" in the 5334A design. So do not be alarmed by this behavior if you are trying to do a sanity check. Rick Karlquist N6RK On 5/21/2014 1:18 PM, Hendrik Dietrich wrote: Dear group, as I just yesterdays implanted a non-original OCXO (C-MAC STP2390C) into a recently ebayed counter, I wanted to share my experience: Swapping C8 to C100 position as per 5334B Service Manual (the B) is fine. J8, the connector for Option 010, is not in the 10811 layout as in the B. As I cannot find a A service manual, I had to poke and trace. This table will give you the pinout of the connector J8, with the lowest row representing the pins that are closer to the front, seen from component side top and the left column closer to the right edge of the PCB: OFF State +30V I +30V GNDI GND I I +15V I +15V I 10 MHz out ON State +29V I +29V GNDI GND I -5V I -5V +15V I +15V I 10 MHz out A 10 turn pot was mounted on the hole on the backside of the unit, connected to the EFC input of the Osc. as a voltage divider of course. All wires are twisted pairs (or twisted triple talking about the EFC.) even the 10 MHz is not a coax - yet. Having the rig open, I discovered burnt resistors at the 50 Ohm Termination of Channel A (only used B terminated so far), where the previous owner even stacked new resistors right on top of the original ones. (both pairs burned). A 619 Ohm Resistor in the ARM Path was also burned but Diodes OK, so I replaced it with a 620 Ohm Resistor, as expected without adverse effects. Counter and OCXO cost me about the price of a single 10811. Greetings Hendrik ___ 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] [WOT] 2014 Million £ Longitude Prize
> To keep Tom happy please reply off list. > bro...@pacific.net > That's correct. If you find yourself typing OT or WOT in the subject line, that's a clue to stop right there. /tvb ___ 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] [WOT] 2014 Million £ Longitude Prize
Hi Paul: My post that started this was because of the effect of the original longitude prize on keeping time. For the past month I've been reading about the obesity, Type II diabetes, and other metabolic syndrome diseases &etc. It turns out that due to bad science the "low fat" diet has been the U.S. government recommendation for many decades and it was a mistake. If you follow it, you consume a large number of carbohydrates which drive insulin which drives fat and leads to metabolic syndrome. Drinking a can of sugar soda pop, a can of beer or a glass of organic fruit juice has exactly the same effect on your waistline and liver. This diet has killed an uncountable number of people. For more see: http://www.prc68.com/I/DietNutrition.html To keep Tom happy please reply off list. bro...@pacific.net Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html paul swed wrote: Dave Dementia would be my thought. We all face that possibility, it can make time stand still or go in reverse or simply disappear. Will say of all of them that actually made me stop and think. How would you do something that could help a person live a better longer life. Regards Paul WB8TSL On Wed, May 21, 2014 at 4:02 PM, Dr. David Kirkby wrote: On 20 May 2014 21:19, paul swed wrote: Boy this is really off target I guess. To get it back on topic, if one of the options was going to be "time" related, what would it be? Dave ___ 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] HP5334A Option 010 replacement connector J8
Dear group, as I just yesterdays implanted a non-original OCXO (C-MAC STP2390C) into a recently ebayed counter, I wanted to share my experience: Swapping C8 to C100 position as per 5334B Service Manual (the B) is fine. J8, the connector for Option 010, is not in the 10811 layout as in the B. As I cannot find a A service manual, I had to poke and trace. This table will give you the pinout of the connector J8, with the lowest row representing the pins that are closer to the front, seen from component side top and the left column closer to the right edge of the PCB: OFF State +30V I +30V GNDI GND I I +15V I +15V I 10 MHz out ON State +29V I +29V GNDI GND I -5V I -5V +15V I +15V I 10 MHz out A 10 turn pot was mounted on the hole on the backside of the unit, connected to the EFC input of the Osc. as a voltage divider of course. All wires are twisted pairs (or twisted triple talking about the EFC.) even the 10 MHz is not a coax - yet. Having the rig open, I discovered burnt resistors at the 50 Ohm Termination of Channel A (only used B terminated so far), where the previous owner even stacked new resistors right on top of the original ones. (both pairs burned). A 619 Ohm Resistor in the ARM Path was also burned but Diodes OK, so I replaced it with a 620 Ohm Resistor, as expected without adverse effects. Counter and OCXO cost me about the price of a single 10811. Greetings Hendrik ___ 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] 2014 Million £ Longitude Prize
Dave Dementia would be my thought. We all face that possibility, it can make time stand still or go in reverse or simply disappear. Will say of all of them that actually made me stop and think. How would you do something that could help a person live a better longer life. Regards Paul WB8TSL On Wed, May 21, 2014 at 4:02 PM, Dr. David Kirkby wrote: > On 20 May 2014 21:19, paul swed wrote: > > Boy this is really off target I guess. > > To get it back on topic, if one of the options was going to be "time" > related, what would it be? > > Dave > ___ > 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] 2014 Million £ Longitude Prize
On 20 May 2014 21:19, paul swed wrote: > Boy this is really off target I guess. To get it back on topic, if one of the options was going to be "time" related, what would it be? Dave ___ 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] LORAN
I have some parts of LORAN receivers. There is a rumor that LORAN will be reactivated. IS there any truth to this rumor? Trying to clean up and recycle the stuff that cannot be used. Thanks 73 Glenn WB4UIV ___ 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.
