Re: [time-nuts] Austron 2200A investigation
Maybe a bit quick off the mark here. They definitely used the DDS technique with their later telecom modules, but thinking about it, I'm now not sure the 2200 or 2201 used this. Apologies for any confusion. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Rob Kimberley Sent: 19 May 2013 17:43 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Austron 2200A investigation The Rb was externally calibrated and then left to free run. They then used DDS to get frequency o/p. Austron used this technique a lot with their later telecom GPS modules. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Luciano Paramithiotti Sent: 19 May 2013 09:14 To: time-nuts@febo.com Subject: [time-nuts] Austron 2200A investigation Hi, I have an Austron 2200A with FRS rubidium option. After 30 min. powerup and locking, PPS and Freq alarm goes up. The receiver position and the FRS are ok. Looking the Rubidium and controller connection cable, I have seen the pin 8 (frequency control)of the rubidium is never been connected. The question are: 1) how the PLL can happen? Cannot ! Different operation? 2) some one have the interface's schematic p.n. 10312676 Osc cntl freq cntr ? thank you, -- Luciano Timeok visit : www.timeok.it ___ 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] Distribution amps for Thub=nderbolt and David partridges divider box?
Hi again, Chris; The HV at the end of the model number indicates that the unit is capable of handling high voltage (up to 5V - TTL level) on the sync channel. The 0.7/1.0 Volt switch is to provide a bit of extra gain for long cable runs. Aside from the HV difference, the unit appears to be very close to the ADA 3-80 in capabilities. It looks quite well suited for a DA. It has more channels than the ADA 3-80; a big plus. The HV option is not a detriment... the sync channel can be used for TTL level signals., whereas the normal channels are for low-level signals (0.3 - 1.5 VPP). Just curious, how much is this unit being offered to you for? Cheers, Dave M 19/05/2013 17:27 Hi Dave, I saw them on Ebay after a friend sent me the link. They are here in the UK, whereas all the ADA 3-80's I have found have been in the USA with associated high postage costs. Should I snap one up? http://www.ebay.co.uk/itm/Extron-ADA-6-300MX-HV-HDTV-RGBHV-1-x-6-Analog-Video-Distribution-Amplifier-DA-/200906840539?pt=UK_Sound_Vision_Otherhash=item2ec6fb19db Thanks Dave and Charles for the replies! -- Best Regards, Chris Wilson. ___ 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] OCXO Adjustment Question
It's nice to have something to do. Sorry to hear of the 'bad' magic but, at least, it's not the same problem all over again. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Frederick Bray Sent: Sunday, May 19, 2013 12:11 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OCXO Adjustment Question Well, I also had some bad magic happen. Last night, I decided that I would shutdown my HP 8935 so that I could move it back to its usual place. When I turned it on this a.m. it wouldn't power up. There is a known failure mode in the power supplies of the 89XX series. I will probably just do an exchange for a re-built supply. It looks like I will have a new project for next weekend! Fred On 5/19/2013 9:10 AM, J. L. Trantham wrote: Good to hear. I love it when magic happens. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Frederick Bray Sent: Saturday, May 18, 2013 5:55 PM To: time-nuts@febo.com Subject: Re: [time-nuts] OCXO Adjustment Question Thanks to all the people who have commented, I believe that I have recovered the original Ovenaire OCXO. I re-flowed a bunch of solder joints on the PC board(s) and reassembled the oven with the foam. Even without the can over it, it is now stable. I plan to complete the re-assembly and leave it as it presently is after setting it to a GPSDO with a scope. I will save the MV89 for another project. Fred ___ 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 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] Distribution amps for Thub=nderbolt and David partridges divider box?
From: Chris Wilson ch...@chriswilson.tv To: time-nuts@febo.com Subject: Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box? Hi again, Chris; The HV at the end of the model number indicates that the unit is capable of handling high voltage (up to 5V - TTL level) on the sync channel. The 0.7/1.0 Volt switch is to provide a bit of extra gain for long cable runs. Aside from the HV difference, the unit appears to be very close to the ADA 3-80 in capabilities. It looks quite well suited for a DA. It has more channels than the ADA 3-80; a big plus. The HV option is not a detriment... the sync channel can be used for TTL level signals., whereas the normal channels are for low-level signals (0.3 - 1.5 VPP). Just curious, how much is this unit being offered to you for? Cheers, Dave M 19/05/2013 17:27 Hi Dave, I saw them on Ebay after a friend sent me the link. They are here in the UK, whereas all the ADA 3-80's I have found have been in the USA with associated high postage costs. Should I snap one up? http://www.ebay.co.uk/itm/Extron-ADA-6-300MX-HV-HDTV-RGBHV-1-x-6-Analog-Video-Distribution-Amplifier-DA-/200906840539?pt=UK_Sound_Vision_Otherhash=item2ec6fb19db Thanks Dave and Charles for the replies! \ Yes... .Jump on it! Seems to be a good price for it. If I needed a DA, I'd buy it in an instant. Cheers, Dave M ___ 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] Distribution amps for Thunderbolt
These are handy little boxes for the money. Unfortunately the outputs are not isolated from each other (galvanically and signal-wise) so be mindful that if you connect/disconnect one port, the adjacent port will be affected. Unless you need to, it is probably best to wire all 3 inputs in parallel (with a single 50 ohm termination) and use only one output from each buffer. That still gives you 3 or 4 channels with reasonable isolation. The next step would be to replace the output BNCs with plastic-body types and install isolation transformers for full galvanic isolation (no ground loops). Didier On Sun, May 19, 2013 at 3:58 AM, Charles P. Steinmetz charles_steinm...@lavabit.com wrote: Chris wrote: I have been offered one of these: ADA 6 300MX HV HDTV RGBHV 1 x 6 Analog Video Distribution Amplifier I *THINK* it should meet my needs except the HV bit worries me. It seems this means it has not got unity gain, but a gain of 0.7 or 1 volt, switch selectable. Could anyone comment if it's suitable to use my Trimble Thunderbolt with several pieces of test gear at the same time? Thanks. Here in the UK the ADA-3-80 seems a rare find. HV just means that it has an additional sync channel (Horizontal and Vertical). I think MX means selectable gain. I have two plain ADA 6's (no MX, no HV) that I used before I built my own iso/DAs. The gain switching components are present, but the switch itself is not populated, so it runs at unity gain overall (the amplifier runs at x2 and each output is back-terminated). My ADA 6's use 6, CLC409 amplifiers and, when modified with 50 ohm input and output terminations, each section (3 jacks) can drive 3, 50 ohm outputs to +13dBm with ~1dB of headroom (I generally only fed 2, 50 ohm loads from any one section). Like any video DA, it should have much smaller coupling caps installed to restrict its low-frequency response to HF. You need 21, size 1206 (SMD) 50 ohm resistors and some 100 nF capacitors to do the mod (I used NP0 ceramics). You also need a deep socket (9/16, I think) to get the PC card dismounted from the back panel (it is mounted by the BNC connectors). As supplied, there are 3, 1x6 DAs in the box. You can parallel inputs internally as desired (deleting duplicate input terminations) to make one, 1x18 DA or one each 1x12 and 1x6 DAs. You really shouldn't have more than one HF reference frequency running around inside a DA, so the 1x18 configuration is probably the most useful. I was quite happy with mine for routine distribution of 1/5/10 MHz. Best regards, Charles __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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] Distribution amps for Thub=nderbolt and David partridges divider box?
On 19/05/13 19:12, Dave M wrote: Yes... .Jump on it! Seems to be a good price for it. If I needed a DA, I'd buy it in an instant. I just grabbed a pair! (After missing out on the Soekris boxes!) They should go well with the A2100 Timing Receivers that are currently sat in customs, and the Z3816A of mine, as well as the HP 5328B with a 10811, and the 8657B :) Hopefully I can convince a friend of mine to do the 75 ohm to 50 ohm surface mount conversion! Gotta love ebay when you (or someone else) knows what they are buying! Iain ___ 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] Trimble Acutime Gold PPS
Hi! I am struggling trying to convert my Acutime's PPS signal from RS422 to RS232 for NTP use. I am using this converter: http://www.dpieshop.com/quatech -sscvt500n-rs232-to-rs422485-serial-converter-p-282.html and I connected - Port A (T+) to R+ on the converter - Port A (T-) to R- on the converter - PPS+ to T+ on the converter - PPS- to T- on the converter On the RS232 part of the converter - TXD (pin 3) to computer pin 1 (DCD) - RXD (pin 2)to computer pin 2 (RXD) - GND (pin 5)to computer pin 5 (GND) all other pins are connected to the same pin on the computer except for the DCD on the converter which is not connected. I can see the serial time code on the computer yet the PPS (a long 400 ms one) doesn't seem to reach the computer. I've tried everything I could remember off and connecting the RS422 PPS+ pin directly to the computer makes the NTP daemon stop randomly and losing the PPS signal. I really think I need to convert the PPS signal (30 meters long cable). Without PPS and using this converter NTP works fine. The problem is the jitter I am getting. I think I've exhausted every option with this converter and found this converter: http://www.ko4bb.com/~bruce/GPS_RS232_RS422_Transceiver.html. I might try it. Anyone here tried it or has any input for this situation?? I also think that from a time nut perspective building my converter instead of using a black box will enable me to see what is the delay in the signal conversion. Any help would be highly appreciated. Kind regards, Miguel ___ 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] Distribution amps for Thub=nderbolt and David partridges divider box?
On 19/05/13 19:12, Dave M wrote: Yes... .Jump on it! Seems to be a good price for it. If I needed a DA, I'd buy it in an instant. I just grabbed a pair! (After missing out on the Soekris boxes!) They should go well with the A2100 Timing Receivers that are currently sat in customs, and the Z3816A of mine, as well as the HP 5328B with a 10811, and the 8657B :) Hopefully I can convince a friend of mine to do the 75 ohm to 50 ohm surface mount conversion! Gotta love ebay when you (or someone else) knows what they are buying! Iain 19/05/2013 21:54 He appears to have plenty, but I was also notified he'd sold something like 15 in the last 24 hours, by an automated Ebay pop up? Just bought one myself! -- Best Regards, Chris Wilson. ___ 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] Trimble Acutime Gold PPS
Without a full schematic diagram about the only thing I can ask is if yuremembered that for RS232 the control and data signals are reversed. For rs-232 Tx and Rx use a negative (low) for a logic one. But DCD uses the other convention with a positive meaning one.. So if you can see the serial data you have that correct. try flipping the RS422 wire for the control signal. On Sun, May 19, 2013 at 2:03 PM, Miguel Barbosa Gonçalves m...@mbg.pt wrote: Hi! I am struggling trying to convert my Acutime's PPS signal from RS422 to RS232 for NTP use. I am using this converter: http://www.dpieshop.com/quatech -sscvt500n-rs232-to-rs422485-serial-converter-p-282.html and I connected - Port A (T+) to R+ on the converter - Port A (T-) to R- on the converter - PPS+ to T+ on the converter - PPS- to T- on the converter On the RS232 part of the converter - TXD (pin 3) to computer pin 1 (DCD) - RXD (pin 2)to computer pin 2 (RXD) - GND (pin 5)to computer pin 5 (GND) all other pins are connected to the same pin on the computer except for the DCD on the converter which is not connected. I can see the serial time code on the computer yet the PPS (a long 400 ms one) doesn't seem to reach the computer. I've tried everything I could remember off and connecting the RS422 PPS+ pin directly to the computer makes the NTP daemon stop randomly and losing the PPS signal. I really think I need to convert the PPS signal (30 meters long cable). Without PPS and using this converter NTP works fine. The problem is the jitter I am getting. I think I've exhausted every option with this converter and found this converter: http://www.ko4bb.com/~bruce/GPS_RS232_RS422_Transceiver.html. I might try it. Anyone here tried it or has any input for this situation?? I also think that from a time nut perspective building my converter instead of using a black box will enable me to see what is the delay in the signal conversion. Any help would be highly appreciated. Kind regards, Miguel ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] Time Nut Pickens at the MIT Flea ?
Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod ___ 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] Trimble Acutime Gold PPS
On 5/19/2013 5:03 PM, Miguel Barbosa Gonçalves wrote: - Port A (T+) to R+ on the converter - Port A (T-) to R- on the converter - PPS+ to T+ on the converter - PPS- to T- on the converter On the RS232 part of the converter - TXD (pin 3) to computer pin 1 (DCD) - RXD (pin 2)to computer pin 2 (RXD) - GND (pin 5)to computer pin 5 (GND) I can see the serial time code on the computer yet the PPS (a long 400 ms one) doesn't seem to reach the computer. You're trying to have two different signals sourced on the 422 side converted to 232 outputs. That converter is bidirectional, it converts one signal from 422 to 232, and another from 232 to 422. Your PPS signal is going into an output on the converter. ___ 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] Trimble Acutime Gold PPS
No dia 19/05/2013, às 22:44, Mike S mi...@flatsurface.com escreveu: On 5/19/2013 5:03 PM, Miguel Barbosa Gonçalves wrote: - Port A (T+) to R+ on the converter - Port A (T-) to R- on the converter - PPS+ to T+ on the converter - PPS- to T- on the converter On the RS232 part of the converter - TXD (pin 3) to computer pin 1 (DCD) - RXD (pin 2)to computer pin 2 (RXD) - GND (pin 5)to computer pin 5 (GND) I can see the serial time code on the computer yet the PPS (a long 400 ms one) doesn't seem to reach the computer. You're trying to have two different signals sourced on the 422 side converted to 232 outputs. That converter is bidirectional, it converts one signal from 422 to 232, and another from 232 to 422. Your PPS signal is going into an output on the converter. Hi!! I suspected that this could be the case. I think I'll build the converter whose schematic I posted previously. I will be entertained for a few days for sure. Thanks for your help! Regards, Miguel ___ 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] Time Nut Pickens at the MIT Flea ?
Not me. IMO, the pickings were pretty slim. I think a number of ventors opted for Dayton. -John == Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod ___ 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] Time Nut Pickens at the MIT Flea ?
I grabbed a real nice Leitech distribution amplifier - but I took it home and it was empty! I walked back and returned it for a refund, but the seller said he had a whole stack in his office. I was gonna post to the list when I sort it out - it was a real bargin, and he said he might be willing to ship them around. Andy Bardagjy bardagjy.com On Sun, May 19, 2013 at 4:42 PM, Stan, W1LE stanw...@verizon.net wrote: Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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] OCXO Adjustment Question
Usually this type of failure comes from the startup section of the power supply. Try to locate the resistor and the electrolytic capacitor of the driver IC. The resistor (in the 68K - 390K range) connects the V+ bus to this low voltage capacitor and gives the startup voltage. On Sun, May 19, 2013 at 7:19 PM, J. L. Trantham jlt...@att.net wrote: It's nice to have something to do. Sorry to hear of the 'bad' magic but, at least, it's not the same problem all over again. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Frederick Bray Sent: Sunday, May 19, 2013 12:11 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OCXO Adjustment Question Well, I also had some bad magic happen. Last night, I decided that I would shutdown my HP 8935 so that I could move it back to its usual place. When I turned it on this a.m. it wouldn't power up. There is a known failure mode in the power supplies of the 89XX series. I will probably just do an exchange for a re-built supply. It looks like I will have a new project for next weekend! Fred On 5/19/2013 9:10 AM, J. L. Trantham wrote: Good to hear. I love it when magic happens. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Frederick Bray Sent: Saturday, May 18, 2013 5:55 PM To: time-nuts@febo.com Subject: Re: [time-nuts] OCXO Adjustment Question Thanks to all the people who have commented, I believe that I have recovered the original Ovenaire OCXO. I re-flowed a bunch of solder joints on the PC board(s) and reassembled the oven with the foam. Even without the can over it, it is now stable. I plan to complete the re-assembly and leave it as it presently is after setting it to a GPSDO with a scope. I will save the MV89 for another project. Fred ___ 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 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] 10Mhz Sine from Square Wave Synthesizer
Hi folks, I recently picked up a Symmetricom SA.22c rubidium oscillator. According to the datasheet, it outputs a square wave with programmable frequency (well you can pick among some set of frequencies). I'd like to build up a small circuit locked to the square wave output which outputs a 10MHz sine wave for use as my house clock for my various instruments (spec an, counter etc). I of course could distribute the square wave, but am concerned about harmonics, among other things. The FE-5680A uses a AD9830A DDS to synthesize its output. Is a DDS the right way to go - in terms of performance, phase noise and so on? I suppose I could do this with a tank or some other analog circuit, but.. Andy Bardagjy bardagjy.com ___ 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] Net4501's cheap...
I snatched one for $20 and they are now $59 or best offer. On Sun, May 19, 2013 at 11:18 AM, Bob Camp li...@rtty.us wrote: Hi There are a number of things that a Net4501 could be used for…. Bob On May 19, 2013, at 10:45 AM, Jason Rabel ja...@extremeoverclocking.com wrote: Just a heads up, there are some (8+ @ last count) used Soekris Net4501's for $29 on eBay (Search for: Soekris)... I submitted a bid for $20 each and it was instantly accepted... Don't know how low you can go, from the description the guy wants to get rid of them or they are going in the trash. Seems like a good deal if you are looking to make a little NTP server, especially compared to the retail price for a net4501... ;) I'm not affiliated with the seller in any way, I just love those little net4501's... I already have 5 of them, I don't know why I just bought 5 more... lol... Now I need more GPS modules! ___ 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] OCXO Adjustment Question
Thanks for the info. I had a general idea that it might be something like this, but it's helpful to know what to look for. I won't have time to dig into it until next weekend. Unfortunately, HP's documentation is not generally available so it may take some exploring. On 5/19/2013 4:02 PM, Azelio Boriani wrote: Usually this type of failure comes from the startup section of the power supply. Try to locate the resistor and the electrolytic capacitor of the driver IC. The resistor (in the 68K - 390K range) connects the V+ bus to this low voltage capacitor and gives the startup voltage. ___ 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] Ovenaire OCXO -- Final Diagnosis Summary
I may not have mentioned that I think I figured out the underlying problem with this OCXO lies with the trimpot in the oven control circuit. (I believe that someone mentioned this as a possibility, so I can't take credit for finding it on my own.) Some of the other things I did helped, but adjustment of the trimpot was the final issue. If the pot is misadjusted, the oscillator will wander all over the place as the oven temperature swings wildly. I drilled a second hole in the Ovenaire case so that I could access the pot. I also monitored the current to the unit with a DVM. When the oscillator started wandering, I tweaked the trimpot until the current increased, indicating the oven was activated. I kept adjusting it to the point that the frequency varies by 0.1 Hz on my GPSDO counter. Perhaps it is less than that, but I don't have enough digits to say. (I know that for final adjustment, I will need to use a scope but the counter does let me see if the OCXO is wildly unstable.) Now, it is clear that the adjustment is very touchy. I am going to remount the assembly in the Cushman tonight or early tomorrow and see if handling it has made it unstable. If so, next weekend I will tear it down again and figure out the value of the trimpot and the number of turns. If I can find a trimpot with more turns, I will buy it. Otherwise, I will just get an exact replacement. All of this has caused me to realize that the Ovenaire is probably still quite usable for what it was designed to do. Although I considered installing the MV89 in its place, the Cushman power supply isn't adequate to handle it. Thanks again to all. Fred Bray ___ 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] Net4501's cheap...
I got 2 Sent from mobile On May 19, 2013, at 6:07 PM, Didier Juges shali...@gmail.com wrote: I snatched one for $20 and they are now $59 or best offer. On Sun, May 19, 2013 at 11:18 AM, Bob Camp li...@rtty.us wrote: Hi There are a number of things that a Net4501 could be used for…. Bob On May 19, 2013, at 10:45 AM, Jason Rabel ja...@extremeoverclocking.com wrote: Just a heads up, there are some (8+ @ last count) used Soekris Net4501's for $29 on eBay (Search for: Soekris)... I submitted a bid for $20 each and it was instantly accepted... Don't know how low you can go, from the description the guy wants to get rid of them or they are going in the trash. Seems like a good deal if you are looking to make a little NTP server, especially compared to the retail price for a net4501... ;) I'm not affiliated with the seller in any way, I just love those little net4501's... I already have 5 of them, I don't know why I just bought 5 more... lol... Now I need more GPS modules! ___ 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 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] 10 MHz Sine form Sqaure Wave Synthesizer
For Andy - It is far easier in terms of bandwidth and power required to distribute sine waves, and that is the method most used. The sine wave is more easily transported via coax for long distances with no distortion issues. I suggest you terminate the output of your oscillator in a nice 6 dB pad to set the load impedance and to set the source seen by the next stage to around 50 Ohms. The next stage should be a low pass filter of about 4 poles with a cutoff at about 12-15 MHz. That will clean up the square wave and get you a good looking sine wave without much harmonic content and no critical tuning to set it up. Then follow that with an amplifier to get the level up and to drive the various loads. This is not the only architecture, but it will preserve the basic short term stability of your source. A PLL based scheme can either improve it or make it worse depending upon the design of the PLL and the VCO employed. You would still need a filter to clean up and filter VCO harmonics (if they exist) and the output buffer amplifier. Various MMIC chips exist that can amplify a 50 OHM source and drive a 50 OHM load with outputs up to 20 dBm and gains of up to 19 dB. These are untuned and work from 1 MHz up to several GHZ. -john k6iql -Original Message- From: time-nuts-request time-nuts-requ...@febo.com To: time-nuts time-nuts@febo.com Sent: Sun, May 19, 2013 8:15 pm Subject: time-nuts Digest, Vol 106, Issue 92 Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: Trimble Acutime Gold PPS (Miguel Barbosa Gon?alves) 2. Re: Time Nut Pickens at the MIT Flea ? (J. Forster) 3. Re: Time Nut Pickens at the MIT Flea ? (Andy Bardagjy) 4. Re: OCXO Adjustment Question (Azelio Boriani) 5. 10Mhz Sine from Square Wave Synthesizer (Andy Bardagjy) 6. Re: Net4501's cheap... (Didier Juges) 7. Re: OCXO Adjustment Question (Frederick Bray) 8. Ovenaire OCXO -- Final Diagnosis Summary (Frederick Bray) -- Message: 1 Date: Sun, 19 May 2013 22:54:39 +0100 From: Miguel Barbosa Gon?alves m...@mbg.pt To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Trimble Acutime Gold PPS Message-ID: -6084039917996433135@unknownmsgid Content-Type: text/plain; charset=ISO-8859-1 No dia 19/05/2013, ?s 22:44, Mike S mi...@flatsurface.com escreveu: On 5/19/2013 5:03 PM, Miguel Barbosa Gon?alves wrote: - Port A (T+) to R+ on the converter - Port A (T-) to R- on the converter - PPS+ to T+ on the converter - PPS- to T- on the converter On the RS232 part of the converter - TXD (pin 3) to computer pin 1 (DCD) - RXD (pin 2)to computer pin 2 (RXD) - GND (pin 5)to computer pin 5 (GND) I can see the serial time code on the computer yet the PPS (a long 400 ms one) doesn't seem to reach the computer. You're trying to have two different signals sourced on the 422 side converted to 232 outputs. That converter is bidirectional, it converts one signal from 422 to 232, and another from 232 to 422. Your PPS signal is going into an output on the converter. Hi!! I suspected that this could be the case. I think I'll build the converter whose schematic I posted previously. I will be entertained for a few days for sure. Thanks for your help! Regards, Miguel -- Message: 2 Date: Sun, 19 May 2013 15:05:58 -0700 (PDT) From: J. Forster j...@quikus.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Time Nut Pickens at the MIT Flea ? Message-ID: 12375.12.226.214.5.1369001158.squir...@popaccts.quikus.com Content-Type: text/plain;charset=iso-8859-1 Not me. IMO, the pickings were pretty slim. I think a number of ventors opted for Dayton. -John == Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod ___ 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. -- Message: 3 Date: Sun, 19 May 2013 18:55:13 -0400 From: Andy Bardagjy a...@bardagjy.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Time Nut Pickens at the MIT Flea ? Message-ID: CA+hd4YjLkcdYKBfuCjN1Q1Y=nbbvbt0x-9ush-fwr-xpxpg...@mail.gmail.com
Re: [time-nuts] 10Mhz Sine from Square Wave Synthesizer
If you only want a house clock from the Rb osc then why go to all the trouble? Just put together a low pass filter to the Rb squre wave and get rid of the higher harmonics above 10 Mhz ... that should give you a clean 10Mhz wave based on the Rb performance jerry -Original Message- From: Andy Bardagjy [mailto:a...@bardagjy.com] Sent: Sunday, May 19, 2013 19:31 To: Discussion of precise time and frequency measurement Subject: [time-nuts] 10Mhz Sine from Square Wave Synthesizer Hi folks, I recently picked up a Symmetricom SA.22c rubidium oscillator. According to the datasheet, it outputs a square wave with programmable frequency (well you can pick among some set of frequencies). I'd like to build up a small circuit locked to the square wave output which outputs a 10MHz sine wave for use as my house clock for my various instruments (spec an, counter etc). I of course could distribute the square wave, but am concerned about harmonics, among other things. The FE-5680A uses a AD9830A DDS to synthesize its output. Is a DDS the right way to go - in terms of performance, phase noise and so on? I suppose I could do this with a tank or some other analog circuit, but.. Andy Bardagjy bardagjy.com ___ 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] Net4501's cheap..
Seller obviously figured out that somebody feels they are of value and adjusted the selling price to see what he can squeeze out of them. I'd suggest making a $20 offer if you want to try to drive the price back down to what is reasonable Message: 6 Date: Sun, 19 May 2013 18:07:51 -0500 From: Didier Juges shali...@gmail.com To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Net4501's cheap... I snatched one for $20 and they are now $59 or best offer. ___ 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] Time Nut Pickens at the MIT Flea ?
We should plan a Time-Nuts BOF lunch after the next flea. Saw little TN gear @ Dayton save one Efretom RBI time base for $1800 and a few 10811s of dubious quality for $50 ea. the dents put me off gambling on one since I was given or the afternoon before! ;) On May 19, 2013, at 21:50, paul swed paulsw...@gmail.com wrote: Hello to the group. I did see the leitch video DA's. Was a good price if the DA's were in the case. The other thing to watch out for is that Leitch made all types of DAs digital also. You want the simple vide monitoring DA, Equalizing DAs are OK also delays are a pain. John it was good to see you and Jim. Great Wx. As for the pickens not much at all. I picked up to EGG RB oscillators and warming one up right now to see if it will work. At $20 each worth a try. Other then that parts and the real find a HPIB frame for Tek modules for $20. Been looking for one for quite a while. But really little time-nuttery stuff. Stan one day one way or another would be good to run into you. I also did not see Paul. (The other one who is also a slight time nut) Regards Paul On Sun, May 19, 2013 at 6:55 PM, Andy Bardagjy a...@bardagjy.com wrote: I grabbed a real nice Leitech distribution amplifier - but I took it home and it was empty! I walked back and returned it for a refund, but the seller said he had a whole stack in his office. I was gonna post to the list when I sort it out - it was a real bargin, and he said he might be willing to ship them around. Andy Bardagjy bardagjy.com On Sun, May 19, 2013 at 4:42 PM, Stan, W1LE stanw...@verizon.net wrote: Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nuts 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 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] OCXO shock protection
All, We will be moving to southern California in the near future. My question if for people who live in that area is do you need to do additional shock mounting for OCXO’s because of the ongoing, usually minor, earth tremors that take place? I will be running two of the Lucent units and two HP 10811 series which are in my 5370B TIC’s. The condo is built on a concrete slab and the only available space will be in the garage. In the Absolute Audio magazine they have had reviews on equipment stands that had spiked legs that went in a complimentary cup on the floor. The idea was to turn any vibration into heat with the spiked points. Comments appreciated. Regards, Perrier ___ 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] Time Nut Pickens at the MIT Flea ?
Good news at least the first EGG RB fired up and after adjusting the synthesizer is locked very nicely. Letting it bake and figuring out the dip switches. They were wrong or purposely offset. Hard to say. Lamp voltage is 12 VDC I suspect thats quite a good number if compared to the old FRS and FRCs I have down in the 5-6V range. The FRS/C run 12 new. Can't really find any documentation, but expected that. Regards Paul WB8TSL On Sun, May 19, 2013 at 10:09 PM, Bob Bownes bow...@gmail.com wrote: We should plan a Time-Nuts BOF lunch after the next flea. Saw little TN gear @ Dayton save one Efretom RBI time base for $1800 and a few 10811s of dubious quality for $50 ea. the dents put me off gambling on one since I was given or the afternoon before! ;) On May 19, 2013, at 21:50, paul swed paulsw...@gmail.com wrote: Hello to the group. I did see the leitch video DA's. Was a good price if the DA's were in the case. The other thing to watch out for is that Leitch made all types of DAs digital also. You want the simple vide monitoring DA, Equalizing DAs are OK also delays are a pain. John it was good to see you and Jim. Great Wx. As for the pickens not much at all. I picked up to EGG RB oscillators and warming one up right now to see if it will work. At $20 each worth a try. Other then that parts and the real find a HPIB frame for Tek modules for $20. Been looking for one for quite a while. But really little time-nuttery stuff. Stan one day one way or another would be good to run into you. I also did not see Paul. (The other one who is also a slight time nut) Regards Paul On Sun, May 19, 2013 at 6:55 PM, Andy Bardagjy a...@bardagjy.com wrote: I grabbed a real nice Leitech distribution amplifier - but I took it home and it was empty! I walked back and returned it for a refund, but the seller said he had a whole stack in his office. I was gonna post to the list when I sort it out - it was a real bargin, and he said he might be willing to ship them around. Andy Bardagjy bardagjy.com On Sun, May 19, 2013 at 4:42 PM, Stan, W1LE stanw...@verizon.net wrote: Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nuts 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 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] OCXO shock protection
sandee...@yahoo.com said: My question if for people who live in that area is do you need to do additional shock mounting for OCXOâs because of the ongoing, usually minor, earth tremors that take place? I wouldn't worry about it. If you have gear you are concerned about, a bit of foam between the gear and shelf might help. What you do need to pay attention to is that stuff doesn't fall over. You bolt things like bookcases to the wall. The USGS and various local government organizations put together a good booklet: Putting Down Roots in Earthquake Country http://earthquake.usgs.gov/prepare/ -- These are my opinions. I hate spam. ___ 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] OCXO shock protection
That is an interesting question. I am in the greater LA area and have several pieces of test gear with OCXO's. I have never taken any precautions other than making sure that the gear can't fall off the shelf or bench. Then again, I may not be doing things to time-nuts standards. There are a couple of fairly simple shock mount options that I can think of if you want to pursue this. One is to pick up a couple of military surplus Hardigg cases that have the 19 inch shock mount racks in them. You could mount the gear in the case or remove the rack and mount it elsewhere. If you just want to do shock mounting for a a single piece of gear, you might take a look at surplussales.com as they have a number of shock mounts. As one other person mentioned, the big thing is to secure shelves and racks to the wall. If you have ever seen any of the earthquake simulations where they put full-size room models on shake tables, you will notice that one of the issues is that the walls will slap against book shelves, knocking them over. Fred On 5/19/2013 7:16 PM, Perry Sandeen wrote: All, We will be moving to southern California in the near future. My question if for people who live in that area is do you need to do additional shock mounting for OCXO’s because of the ongoing, usually minor, earth tremors that take place? ___ 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] OCXO shock protection
Even in an active fault area the unit will see more mechanical vibration comming fomr the building cause by walking around and the wind then by Earthquakes. OK, every few years there might be a few seconds of ground movement. But most of the constant stuff is very local, within the building. On Sun, May 19, 2013 at 7:16 PM, Perry Sandeen sandee...@yahoo.com wrote: All, We will be moving to southern California in the near future. My question if for people who live in that area is do you need to do additional shock mounting for OCXO’s because of the ongoing, usually minor, earth tremors that take place? I will be running two of the Lucent units and two HP 10811 series which are in my 5370B TIC’s. The condo is built on a concrete slab and the only available space will be in the garage. In the Absolute Audio magazine they have had reviews on equipment stands that had spiked legs that went in a complimentary cup on the floor. The idea was to turn any vibration into heat with the spiked points. Comments appreciated. Regards, Perrier ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] Net4501's cheap..
There were two auctions... the $59 ones are new, the others lightly used. Now there are only the new ones left. On Sun, May 19, 2013 at 7:10 PM, Tom Clifton kc0...@yahoo.com wrote: Seller obviously figured out that somebody feels they are of value and adjusted the selling price to see what he can squeeze out of them. I'd suggest making a $20 offer if you want to try to drive the price back down to what is reasonable Message: 6 Date: Sun, 19 May 2013 18:07:51 -0500 From: Didier Juges shali...@gmail.com To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Net4501's cheap... I snatched one for $20 and they are now $59 or best offer. ___ 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] Net4501's cheap..
On Sun, May 19, 2013 at 7:10 PM, Tom Clifton kc0...@yahoo.com wrote: Seller obviously figured out that somebody feels they are of value and adjusted the selling price to see what he can squeeze out of them. I'd suggest making a $20 offer if you want to try to drive the price back down to what is reasonable Don't over pay. These were neat devices in their day but now we have Raspberry Pi for $35 and Arduino and TI's Launchpad lineup. Chris Albertson Redondo Beach, California ___ 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.
