Re: [time-nuts] Using GPS to Fine Tune a Rubidium Frequency Standard.

I do not subscribe to QEX, but I know that all of the ARRL periodicals for 2013 (QST, NCJ and QEX) are on one CD and it is available now from ARRL and its distributors. HTH... 73, geo - n4ua On Fri, Mar 21, 2014 at 9:20 AM, Anders Time anderst...@gmail.com wrote: Does anyone have a copy of

[time-nuts] Starting point for a WWVB project?

While looking for something else in the basement, I found this Ultralink 301/333 WWVB receiver: https://plus.google.com/u/0/photos/116677848251094111716/albums/6038922880078010001 I think I picked it up because the case looked useful, but I haven't molested it. It does not seem to work and I can

Re: [time-nuts] Starting point for a WWVB project?

The Ultralink is spoken for. Thanks... 73, geo - n4ua On Tue, Jul 22, 2014 at 1:10 PM, George Dubovsky n4ua...@gmail.com wrote: While looking for something else in the basement, I found this Ultralink 301/333 WWVB receiver: https://plus.google.com/u/0/photos/116677848251094111716/albums

Re: [time-nuts] Need help with transformer core

Hi Corby, I have the old data on that Indiana General part: it seems to be O-6 material - 4700 initial perm, 6000 max perm, up to 0.5 MHz, 210 degree C curie point - and F1152-1 is a 36x22 mm ungapped ferramic pot core - AsubL min =11530. If you need more data, I can probably scan the relevant

Re: [time-nuts] Lightning arrestors for GPSDO antenna

If anyone is interested, I have a few NOS Zap-Tech 30-105 (now called CX-TF apparently) surge suppressors available. These are basically a single shunt gas tube (the coaxial center conductor runs through the center of a custom gas tube), and they were sold as GPS in-line suppressors. I use them at

[time-nuts] GPS antennas FS

Someone just posted some GPS base-station antennas for sale on qth.com. I don't recognize the antenna (probably a patch antenna in a radome) and I don't know the seller, but the price looks right for an outdoor unit. http://swap.qth.com/view_ad.php?counter=1021176 73, geo - n4ua

Re: [time-nuts] T-Bolt oven / LH question

You're probably OK. The T'bolt doesn't report oven temp, but rather the temp near the edge of the pwb some distance from the oscillator. Think of it as the environmental temp inside the package. If you ever look inside, look for an 8 pin Dallas Semi IC that is labeled DS1620; it's right behind the

Re: [time-nuts] Adjusting HP 5065A frequency

On Mon, Oct 22, 2012 at 1:00 PM, Tom Van Baak t...@leapsecond.com wrote: There's a history to many of the GPSDO products you hear us talk about. I believe the original TBolt (fancy red case) did have an OCXO but it wasn't particularly high quality. Perhaps Bob can shed light on this. 99% of

Re: [time-nuts] Surge Arresters

I have a box-full of GPS protectors that were built by a company called ZapTech. They are just coaxial gas tubes that seem to have a strike voltage around 60-90 volts. We replaced them with (MUCH) more expensive PolyPhaser units. I use the ZapTechs on all of my long (600-800 ft) low-freq receiving

Re: [time-nuts] Thunderbolt oven / non-stable operating temperature

Sarah, The reported temperature is not the oven temp, but rather the temp of the circuit board just behind the DB-9 serial connector. As far as I know, the actual oven temp is not available outside the OCXO. Regards, geo On Mon, Dec 10, 2012 at 5:15 PM, Sarah White kuze...@gmail.com wrote:

Re: [time-nuts] Thunderbolt antenna

It seems, just go with quad shield RG-6 and be done with it. I even have part of a spool of that laying around. Maybe more of an issue is how do you properly connect a TNC to that stuff (the antenna has a TNC). Peter Here is one solution:

Re: [time-nuts] thunderbolt fault

The -12 can be anything from -7 to -12V and it will work. The units that were removed from Grayson or Andrew equipment had a zener diode changed on the Thunderbolt (by Trimble) that kept the power alarm from being invoked at low values of this voltage. 73, geo - n4ua On Fri, Feb 26, 2010 at

Re: [time-nuts] 60 KHz Receiver

Speaking of LORAN receivers, I have two Stanford Research Systems FS700 receivers here at work (in central VA) that I have been asked to dispose of. They both have ovenized oscillators, and I have one original manual. The antenna is on the roof, but I think it'll stay there ;-). Any offers for one

Re: [time-nuts] More pictures of the mystery Collins Ru

Well, the outside label does claim it was made by GENRAD... ;-) 73, geo - n4ua On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire p...@petelancashire.comwrote: https://plus.google.com/u/0/photos/111617808980322733757/albums/5890266601277045697 The board with the edge connector was inside

Re: [time-nuts] A day gone awry...

Ed, I can't remember where I ran across it, but a fellow preached a principle he called The Conservation of Bustedness. He posited that you can't have everything working all at once: if you fix the counter, the generator breaks; if you fix the generator, the dishwasher goes on the fritz; fix the

Re: [time-nuts] Trimble T'Bolt

It's the original Thunderbolt. It's the same as the gold-cased OEM units available on the bay, but it includes an internal dc-dc converter that provides the 3 voltages for the gps board. 73, geo - n4ua On Fri, Mar 23, 2012 at 9:33 AM, Stan, W1LE stanw...@verizon.net wrote: Hello The Net, On

Re: [time-nuts] Trimble T'Bolt

Yes, you can, but you need to transplant the in-line power header in the old board to the new board and mount it on the back side of the pwb. 73, geo - n4ua On Fri, Mar 23, 2012 at 9:46 AM, J. L. Trantham jlt...@att.net wrote: Probably older. Date Code is 9932. However, I wonder if you

Re: [time-nuts] wwvb weak on east coast especially when the pre-amps under water.

All, W.L.Gore and Associates makes a whole line of these things, but I'm not sure where you go to buy just one. http://www.gore.com/en_xx/products/venting/protective/index.html?xcmp=ijdgpvmktgurl 73, geo - n4ua On Tue, May 15, 2012 at 2:59 AM, Attila Kinali att...@kinali.ch wrote: On Mon,

[time-nuts] Washington DC-area time-nuts

There is a hamfest in northern Virginia this Sunday: http://manassashamfest.org/ While it's mostly ham radio junque, because it's in the Washington metro area, some hi-tech surplus and microwave stuff does show up. I will be there with a handful of Trimble Thunderbolts and antennas, a nearly-new

Re: [time-nuts] Up And Running

I have lots of little switch boxes, matching networks, amplifiers, etc, mounted outside, usually in gasketed boxes from Bud and Hammond. I put a 0.050 hole in the bottom of all of them. It has proven to be large enough to stay clear of debris and small enough to keep little critters out. I even

[time-nuts] NOS Thunderbolts for sale (w/D1 temp sensor)

Time-nuts; I have three, essentially new Trimble Thunderbolt OEM boards for sale. These were part of a production lot that had been returned to Trimble (several years ago) from the OEM because the wrong zener had been installed in the voltage sense circuit. This is the zener that allows the unit

Re: [time-nuts] CTS TCXO

Marco, My Stanford Research FS700 Loran receiver from about that time period has a CTS Knights 970-2097-0 10 MHz ovenized oscillator in it, and it ran from + and - 15 Vdc. I don't know if this is of any help at all. 73, geo - n4ua On Wed, Feb 10, 2010 at 4:09 PM, Marco IK1ODO

Re: [time-nuts] Thunderbolt hardware revisions

All, The Label you are referring to is applied by the equipment mfgr, and has only a loose correlation to the vintage of the Trimble unit inside the case. The label has a bar code, a mfg serial number, the date the production bar code was issued, the Andrew/Grayson assembly part number

Re: [time-nuts] Active LORAN antenna

I have the schematic of the active antenna, but I will not be able to get to it until Monday. 73, geo - n4ua On Fri, Aug 26, 2011 at 6:00 AM, Ulrich Bangert df...@ulrich-bangert.dewrote: Gentlemen, my friend Frank and I both miss the matching actice antenna for our Standford Research FS700

Re: [time-nuts] Active LORAN antenna

Ulrich, I have the SRS active antenna schematic FS700-14, Revision B, and it is identical to Stan's schematic except that my R3 is 1k and his is 100k. Don't know which is the newer schematic. 73, geo - n4ua On Fri, Aug 26, 2011 at 9:02 AM, Stan, W1LE stanw...@verizon.net wrote: Hello UL,

[time-nuts] Noob question on measuring Allan Deviation on 10 MHz source

List; OK, I need to measure the stability of a 10 MHz sine-wave source. After reading a lot of background info on this list and some of the sources that were referenced, I thought I could get away with a frequency measurement. I now think I was wrong. What I have is an Agilent 53230A counter (a

Re: [time-nuts] Noob question on measuring Allan Deviation on 10 MHz source

On 12/14/2011 3:29 PM, George Dubovsky wrote: List; OK, I need to measure the stability of a 10 MHz sine-wave source. After reading a lot of background info on this list and some of the sources that were referenced, I thought I could get away with a frequency measurement. I now think I was wrong

Re: [time-nuts] metric / English

Not that hard, actually. My 1984-vintage lathe has an inch lead screw, but the quick-change box that drives the leadscrew will do all of the inch and most metric threads directly. The few weird metric pitches are accommodated by changing two gears on the input side of the QC box. I suppose that at

Re: [time-nuts] Thermal insulation choice?

There is a closed-cell foam, aluminum foil clad on one or both sides that is used as HVAC ductwork - they score it with a knife, and fold it to size - that should withstand the temperatures you are contemplating, for a long time. I have seen some approximately 1/2 to 5/8 inch, and the quantities

Re: [time-nuts] 5680A update

Bert, Since you have been running your unit for a long time, what temperature are you holding your 5680 to? I suppose more to the point, I attached my unit to a 1/2 think aluminum plate slightly larger than the 5680 footprint, and that in turn is attached to a painted surface of a cabinet (no

Re: [time-nuts] 5680A update

OK, I remember the fan controller discussion; don't know why I didn't find it just now when I was searching this topic. Thank you very much, Bert. geo On Tue, Jan 17, 2012 at 11:38 AM, ewkeh...@aol.com wrote: I am using a fan that holds it within .1 C Its been month since I measured it but I

Re: [time-nuts] LightSquared vs old GPS gear: Antennas?

I have recently done some side-by-side testing of a new PCTel antenna vs an older Trimble bullet antenna to see if there was any degradation of GPS operation. The PCTel had 26 dB gain and a sharp bandpass filter incorporated that was 60 dB down at the the lower edge of the GPS band (upper edge of

[time-nuts] GPS-disciplined oscillators available

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Last fall, I casually mentioned (over on the HP board) that I had a few surplusTrimble Thunderbolt GPS-disciplined oscillator assemblies available, and I was buried by the response! I have obtained a few more and, if you are

Re: [time-nuts] Thunderbolt power connector crimper

Hi Matt, Any of the AMP Service Tools - I have the I and II - will work. Positions A and B (for the conductor and the insulation respectively) on Service Tool I or E and B on Service Tool II will work nicely. I suspect there are lots of other generic crimpers that will do the job as well. Heck,

Re: [time-nuts] Thunderbolt power connector crimper

, 2015 at 7:44 AM, George Dubovsky n4ua...@gmail.com wrote: Hi Matt, Any of the AMP Service Tools - I have the I and II - will work. Positions A and B (for the conductor and the insulation respectively) on Service Tool I or E and B on Service Tool II will work nicely. I suspect there are lots

Re: [time-nuts] SoftMark USB to GPIB converter

List, I have a genuine NI GPIB-USB-HS in perfect condition for sale; $167 shipped in the US. It has the book and s/w 488.2 for Windows, ver 2.7.3. It was used for about 2 months, 4 years ago. 73, geo - n4ua On Thu, Mar 3, 2016 at 11:15 AM, Clint Jay wrote: > You can have

Re: [time-nuts] Prologix USB-GPIB Controller

I have a real NI GPIB-USB-HS if he'd be interested in that. Prolly cheaper than a new Prologix. geo On Fri, Oct 7, 2016 at 3:15 PM, Dave M wrote: > Does anyone happen to have a Prologix USB-GPIB Controller available for > sale? One of my friends needs one for his