Re: [time-nuts] Thinking outside the box a super reference

Hoi Rick, Thanks for the detailed explanation! On Sat, 5 Nov 2016 08:32:58 -0700 "Richard (Rick) Karlquist" wrote: > In the 5071, the only place 9192 shows up is in the > microwave module that is directly attached to the > coax to waveguide transition into the cavity.

Re: [time-nuts] Thinking outside the box a super reference

Neither Rb cells nor isolators are difficult to source.They are both catalog items. However if using a cavity it may need to be tailored to the available cells.Walk-off isolators using double refraction are somewhat more convenient than those requiring a strong magnetic field. Bruce On

Re: [time-nuts] Newbie With a Z3801 Problem

Hi Dave, For power supply voltages, did you check here: http://www.realhamradio.com/GPS_Frequency_Standard.htm Scroll down the page a bit to get to the power supply info. Your problem is very odd. I retired my Z3801A a while back as it was seeing an occasional error. I should drag it back

Re: [time-nuts] Thinking outside the box a super reference

> > > Just for the heck of it, I'd go laser instead of the old UHF lamp. > > > > With respect to precision machining, that space has changed a lot > > over the last five years, with precision CNC machines, factory > > or home-built, dropping dramatically in price. > Yes, the laser technique is

[time-nuts] building clock ensembles and time-scales (was: Thinking outside the box a super reference)

Hoi Ruslan, On Sat, 5 Nov 2016 14:30:18 -0400 Ruslan Nabioullin wrote: > On 11/03/2016 06:10 PM, Attila Kinali wrote: > > You don't need a hardware project for this, as long as a paper clock > > is enough for you. Just buy a couple of kiwi-sdr (or anything similar), > >

Re: [time-nuts] I love the smell of tantalum in the morning

Ditto. I use hot tweezers -- metcal talon handpiece, in my case. There are other ways to do it if you don't have them. On Nov 6, 2016 3:21 AM, "jimlux" wrote: > On 11/5/16 12:12 PM, Tom Van Baak wrote: > >> See C13 in the attached photo. I need to replace some blown

Re: [time-nuts] Corby Dawson Super 5065a work can I use a miniature Rubidium

Actually some commercial rubidium clocks do use lasers. Check out the Microsemi SA.3Xm family. Nonetheless the point about the wavelength stability requirement is absolutely the case. There are some papers published about the SA.3X clocks. I can't post links to them, but a quick web search for "A

[time-nuts] Time nut soon to be in Shenzhen

I'm in Shanghai now but will be leaving for Shenzhen in a few days. Any one know of any special time nutty stuff to check out in Shenzhen? I expect if I can find the right place I might see piles of OCXO's. Thanks, Christopher and 73 de AI6KG ___

Re: [time-nuts] Time nut soon to be in Shenzhen

Sorry no clue I suspect you will be the Marco Polo of time-nuttery. Have fun and remember pennies per pound. You can have a lot of fun at that cost. Regards Paul WB8TSL On Sun, Nov 6, 2016 at 10:13 AM, Christopher Hoover wrote: > I'm in Shanghai now but will be leaving for

Re: [time-nuts] Corby Dawson Super 5065a work can I use a miniature Rubidium

Anton, Not sure your email suggested a bad lamp. I think it was just the question on the filter. If there is a lamp issue happy to suggest ways of perhaps getting it going again that I have used. Maybe best off line since this has been communicated before. Regards Paul WB8TSL On Sun, Nov 6, 2016

Re: [time-nuts] I love the smell of tantalum in the morning

You might also want normal cold tweezers to place the part. I'm not sure what an orange stick is, around here I'd use a wooden toothpick. Perhaps that's the same thing ! The Swiss Venus tweezers have a lovely finish and the ends always meet. There are probably others as good. If you get some

Re: [time-nuts] Time nut soon to be in Shenzhen

Ref. the thread about burning tantalum capacitors .. If I were going to china I'd be looking at the tools. Many might be low quality (but cheaper than ebay). Others might be excellent. You need to see them to find out. On Sun, Nov 6, 2016 at 4:33 PM, Azelio Boriani

[time-nuts] An idea for an active rubidium maser

Hi, I just had a stupid idea: What if, one would modify a rubidium fountain to launch the atoms not trough two Ramsey cavities, but into an elongated resonant cavity? Ie pump the Rb atoms as it is done with a normal fountain and launch them into the cavity, where they can interact with the field

Re: [time-nuts] I love the smell of tantalum in the morning

I would not recommend purchasing soldering tweezers without trying them first. They are not easy to control solder application when mounting a component. I do really like the Weller rt7 knife tip. On Sunday, 6 November 2016, Adrian Godwin wrote: > SMD parts aren't going

Re: [time-nuts] I love the smell of tantalum in the morning

It's obvious you've never had a manicure, Adrian. An orangewood stick is an instrument for torturing the cuticles. Il faut soufrir pour etre belle! On Sunday, November 6, 2016, Adrian Godwin wrote: > You might also want normal cold tweezers to place the part. I'm not

Re: [time-nuts] I love the smell of tantalum in the morning

SMD parts aren't going to go away. It's worth investing in good tools to deal with them and learning the best way to use them. I'd put tweezers quite high on that list, and although the metcals are worthwhile if you can avoid full price, the chinese tweezers are surprisingly useful at very low

Re: [time-nuts] I love the smell of tantalum in the morning

On 11/6/16 9:24 AM, Scott Stobbe wrote: I would not recommend purchasing soldering tweezers without trying them first. They are not easy to control solder application when mounting a component. tweezers to remove single iron to install use a orange stick to hold the part down while you solder

Re: [time-nuts] Time nut soon to be in Shenzhen

Maybe I have a clue: on the usual auction site there is a new seller (since April 2015) from ShenZhen (Guangdong provice) that has a lot of OCXOs on sale. Not so far (~140km) there is another OCXOs seller (since 2005) in Guangzhou, the capital of Guangdong province. On Sun, Nov 6, 2016 at 4:43

Re: [time-nuts] I love the smell of tantalum in the morning

Another admittedly low-budget way of heating both ends is to use a heat spreader. Solder a short piece of braid to one component end, fold it over the top of the part, and solder it to the other end. Heat the braid in the center, add solder until both ends are melted, and lift the combination

Re: [time-nuts] I love the smell of tantalum in the morning

Heating one end and adding a little solder to the joint will allow you to lift the cap, the leads are folded over tabs so they'll bend nicely and allow the cap to lift, once you've got one end lifted, heat the other and it will come away easily. Clean up the pads with solder wick then you're

Re: [time-nuts] I love the smell of tantalum in the morning

By far the easiest method. https://youtu.be/3jxSKaIRhAQ -=Bryan=- From: time-nuts on behalf of Scott Stobbe Sent: November 6, 2016 1:10 PM To: Discussion of precise time and frequency measurement

Re: [time-nuts] I love the smell of tantalum in the morning

If you are in a position where you are worried about damaging the PCB. (And I would really be worried cutting any part in half with cutters, or cutting leads off an IC with diagonal cutters.) For two leaded parts, "Hot tweezers" work fine. For parts with more leads, like ICs, you need hot air

Re: [time-nuts] HP 5275A

Adrian, Here's a picture of the package you have, with the TI logo on the "heatsink". I pulled it just now from an old car stereo. The PNP Germanium GC588 crosses - not correctly! - to a differently packaged NTE102A which is rated for 1A and 32V with some decent gain. I suspect the GC588 is

Re: [time-nuts] I love the smell of tantalum in the morning

Am 06.11.2016 um 22:16 schrieb Bryan _: By far the easiest method. https://youtu.be/3jxSKaIRhAQ That must be the guy who removes the e**y MV-89s from China from their boards. At least two of mine have scars that are best explained by such a tool. regards, Gerhard

Re: [time-nuts] HP 5275A

A 2N1038 is in a TO-5 or TO-11 package. A 2N1038-2 is a modified or selected part. Is this transistor pressed into a hexagonal bushing that is about 1/2 " long with a 10-32 threaded stud for mounting? If so the bushing/heatsink is part of the transistor. A google search for 2N1038 will show

Re: [time-nuts] I love the smell of tantalum in the morning

I agree - I find them totally useless for applying solder. I'd only use them for removing parts. To solder them, clean the pads as described here and solder one end at a time. On Sun, Nov 6, 2016 at 5:24 PM, Scott Stobbe wrote: > I would not recommend purchasing

[time-nuts] HP 5275A

Slightly off-topic, as this is a general repair question. But it's a TIC. I'm repairing a 5275A timer (all-discreet count logic to 100MHz, neon bulb display, a most amazing bcd to decimal decoder made from neons and LDRs, 1-2-2-4 decade counters ..) and the current problem is a 2n1038-2 germanium

Re: [time-nuts] I love the smell of tantalum in the morning

In the case of the rt7 (or knife soldering tips for other brands) you get a fine point that easily handles 30-32 awg wire, and the edge of the tip is a little over 100 thou long, so for parts 0805 and smaller you just lay the edge along the side of the component and heat both pads and swipe it to

Re: [time-nuts] I love the smell of tantalum in the morning

If the SMD is small enough I have found it easy to remove by just applying a blob of solder to one end, this will quickly gap over to the other lead, and the SMD component and solder ball just slides off the board. Only works on the very small components though. -=Bryan=-

Re: [time-nuts] HP 5275A

Don't know what to say on the transistor. It may have been actually made that way. They did lots of things back then. Yes familiar with the bcd decoder its used in the 5245 class counters also. I think someone was doing some funny stuff at lunch time to come up with that. It was the 60's after

Re: [time-nuts] I love the smell of tantalum in the morning

On 11/6/16 10:47 AM, Adrian Godwin wrote: You might also want normal cold tweezers to place the part. I'm not sure what an orange stick is, around here I'd use a wooden toothpick. Perhaps that's the same thing ! An orange stick is a piece of wood about 1/4" in diameter which has been tapered

Re: [time-nuts] HP 5275A

Just homemade opto-isolators. Used in choppers, too. The transistor was indeed bonded to the heatsink. Just replace the whole thing with a 3-legged regulator? or simply a modern PNP t0-220 with a little heat sink on it. 73, Don On 2016-11-06 15:15, paul swed wrote: Don't know what to say on

Re: [time-nuts] HP 5275A

Yes, further searching reveals that although the 2n1038 is T05, the -2 version is X26 - mounted in a stud by the factory. So it could well be glued. 2N1038s aren't unobtainable though, so I'll keep it original if I can. Even though a 7915 would be fine ! I was a bit puzzled by the insulators.

Re: [time-nuts] HP 5275A

You could try heating the transistor and bushing then give the to5 a shot of cold spray or supper duster hoping it will shrink enough to slide out. On Sunday, 6 November 2016, Adrian Godwin wrote: > Slightly off-topic, as this is a general repair question. But it's a TIC. >

Re: [time-nuts] I love the smell of tantalum in the morning

+1 I only use tweezers for removal. I use the one-side-then-the-other technique described elsewhere in this thread for mounting parts. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] I love the smell of tantalum in the morning

I usually find that the pad itself has enough tin plating to melt and adhere the part's termination so I tack it down like that, solder the second termination, and then go back and solder the first termination. On Mon, 7 Nov 2016 02:34:51 +, you wrote: >The best way to hand solder small SMT

Re: [time-nuts] I love the smell of tantalum in the morning

Thank you everyone for the superb set of replies to this posting over the weekend. I'm sure I will have my 5071A boards working again shortly. Thanks also for the generous offers on- and off-list from people who do this professionally. The level of hands-on experience on this list is amazing.

Re: [time-nuts] I love the smell of tantalum in the morning

jim...@earthlink.net said: > tweezers to remove > single iron to install > use a orange stick to hold the part down while you solder each end. How many hands does that take? I normally use one to hold the iron and the other to apply solder. -- These are my opinions. I hate spam.

Re: [time-nuts] I love the smell of tantalum in the morning

I tear off a short piece of solder and push it up against the part (with orangewood stick) before picking up the iron. Bob LaJeunesse > Sent: Sunday, November 06, 2016 at 7:17 PM > From: "Hal Murray" > To: "Discussion of precise time and frequency measurement" >

Re: [time-nuts] Time nut soon to be in Shenzhen

Hi Welcome to Shenzhen. As far as I know there is no market that you can see pile of OCXO. They were taken off from equipments, and the process is done in the Qingyuan or Shanwei city Guangdong province. The seller might be in Shenzhen, but the source is in Qingyuan/Shanwei. These city have

[time-nuts] I love the smell of tantalum in the morning

The best way to hand solder small SMT parts is to put a blob of solder on one pad, position the part, old it down with something (fingernail works well, maybe tweezers), then touch that pad/solder blob with the iron. The blob should melt and the part should push down into the blob. Make

Re: [time-nuts] HP 5275A

The real hack in the 5245 Nixie tube decoder is that the neon lamps were the memory element. hld On 11/6/2016 2:15 PM, paul swed wrote: Don't know what to say on the transistor. It may have been actually made that way. They did lots of things back then. Yes familiar with the bcd decoder its

Re: [time-nuts] I love the smell of tantalum in the morning

On 11/6/16 4:17 PM, Hal Murray wrote: jim...@earthlink.net said: tweezers to remove single iron to install use a orange stick to hold the part down while you solder each end. How many hands does that take? I normally use one to hold the iron and the other to apply solder. You can hold

Re: [time-nuts] I love the smell of tantalum in the morning

I run two Hakko 936 stations with 907 irons. I use the wide chisel tips, and just heat both sides at once. The two Hakko stations are cheaper than a set of Metcal tweezera(although I would love a set of those) Nathan KK4REY via Newton Mail

Re: [time-nuts] 5071A with ATTENTION flashing

Hi Tom Thanks for the info. I think I should pay a visit to this 5071a again. There are 5 more 5071a 200km away, I need to visit them next week. :) regards Li Ang / BI7LNQ ---Original--- From: "Tom Van Baak" Date: 2016/11/4 00:42:46 To: "Discussion of precise time and

Re: [time-nuts] I love the smell of tantalum in the morning

So what are the odds that the failed cap would be C13? Is this cause for triskaidekaphobia? ;-) Please pardon this random excursion outside the bounds of precision time. Bill Hawkins (who learned not to let kakorraphiophobia lead me to osphresiolagnia [bad odors, not erotic] in