[time-nuts] Seeking Toyocom or NDK through hole oscillator information

[skipp isaham via time-nuts]

Seeking Toyocom or NDK through hole oscillator information


Hello again to the group,

I'm looking for a Data Sheet or information that would provide
the connection information for a (Epson) Toyocom TCO-519 or NDK
PIA3003A Oscillator module, both are through hole mounting.

Both appear to be a reasonably conventional, but now a discontinued
through-hole part, but I'm unable to find any same or similar data
sheet information that would tell me how to use connect them. Both
are 16.368 MHz

Appearance wise, they are both an approx 1 inch square, 3/8" high,
silver metal covered oscillator module. Five through hole mounting
connection leads on the bottom, one in each corner, the fifth lead
is centered along the side between two corners.

A data sheet or even just the generic connection information with
an idea of what each pin does would be wonderful. A few of these
arrived in a parts donation box hand labeled "Trimble Development".

Possibly something Trimble significant with the 16.368 MHz
frequency that I'm not yet aware of... if anyone would care
to speculate, please do.


Thank you in advance for your replies

cheers,
skipp

direct Email skipp...@yahoo.com
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[time-nuts] Trimble / Symmetricom UCCM mini-GPSDO boards

[skipp Isaham via time-nuts]

> From: Mark Sims 
> Subject: [time-nuts] Trimble / Symmetricom UCCM mini-GPSDO boards

> For those of you that have one of these... good-ish news.   I have Lady 
> Heather working with 
> them (well, at least the Trimble works,  the Symmetricoms have not arrived 
> yet and there are 
> a couple of known differences in their commands).  I'll get the code out 
> there when I have a 
> chance to test it with the Symmetricoms.  They seem to fairly nice little 
> units.  Not as tweakable 
> / versatile as a Z3801A, etc but quite usable.

A Trimble Thunderbolt with Lady Heather initiated my interest in small 
micro-controller GPSDO status 
display boards, such as the one sold by (Chris ZL1CVD) on Ebay. I purchased and 
built the status board 
and am very happy with the results. However, as a course project, a friend and 
I rewrote a lot of the code to 
include power savings (interrupts) and a few other extras. 

"ZL1CVD TSIP GPSDO Thunderbolt Nortel Display (PCB Only)" 
Ebay Item number: 111864779325 

Chris's web site for his TSIP board 

https://sites.google.com/site/zl1cvd/tsip 

Anyway, just an offer to freely share the firmware we developed to hopefully 
enhance Chris's board. 

> For those that are thinking about buying one,  be aware that there are some 
> pretty skeezy / clueless 
> / dishonest sellers out there.  People have received units with various parts 
> that have been physically 
> damaged or ripped off the boards.  Apparently one or more of the Chinese 
> scrappers was less than 
> gentle removing them from whatever it was that they came out of.  EEVBLOG has 
> a long thread that
> mentions the Chinese Standard GPSDO Damage Infliction.  A couple of devices 
> (an inductor, a 
> couple of caps, and some connectors) seem to be the most prone to be 
> damaged... most damage 
> was easily repaired.   My Trimble came from a seller with a high reported 
> coefficient of skeezyness, 
> but was in perfect condition.  Oh, and they run on 6V 2A startup,  .8A warmed 
> up. 

I purchased a received dead Thunderbolt from a China based seller, who stalled 
answer replies over weeks 
and then expired the regular Ebay return policy... Eventually with no return 
shipping verification signature 
process at their receiving end of the trip, said returned Thunderbolt was of 
course never credited being "lost 
in transit".  

I then received the return credit only because I paid that purchase with my 
credit card through Paypal. 
Of course, in three weeks the same seller using a different Ebay name put the 
exact same returned 
defective Thunderbolt back up for auction... I had clearly identifiable 
pictures of the defective unit I received... 
I reported it to Ebay (wasn't easy) and eventually the auction was taken down. 
The seller however, remains 
active with current auctions... 

Credit where it's due... 
A number of friends and myself have purchased Thunderbolts from the Australian 
Ebay Seller 
electro_wrench and every one has been received fast and worked very well. 

Back to the ZL1CVD GPSDO status PC board kits/parts... 

If you have/use one of Chris's GPSDO display status boards or even something 
similar you developed, you 
are welcome to try our revised firmware/code (Free of course).  Nothing rocket 
science special but there are 
some novel approaches taken to achieve notable power savings. Developed using 
WinAVR and AVR Dude 
(both software packages are available on the web... and free). 


cheers, 

skipp 
skipp025 at yahoo dot com 
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[time-nuts] one quick WWII CW story

[skipp Isaham via time-nuts]

Just one quick WWII CW story while the subject is active. 

I once read a WWII timeline based story of an American ham, then active in the 
military,  testing his radio station transmitter with a string of V's and then 
quickly signing 
off using his amateur call sign. I believe the story was based that he was in a 
military aircraft in the European Theatre. 

After testing the radio transmitter and antenna system to his satisfaction, 
signing 
his amateur radio call sign and  returning to receive mode... he was quite 
surprised 
to receive a quick signal report, the sender of the received signal report 
quickly signed 
off with his pre-war German call sign. 

I let the source of that story get away many decades past... and I never heard 
if 
the two hams ever met during or post WWII. 

End of story... resume all skate. 

s. 

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[time-nuts] Ovenaire Precision Crystal Oscillator

[skipp Isaham via time-nuts]

Hello again to the Group, 

Someone just handed me an Ovenaire Precision Crystal Oscillator mounted 
on to a PC board with a few added components (metering test point jacks, 
a two transistor buffer amplifier driver). 

This is a 4 pin connection, PC board mount type/model Precision Crystal 
Oscillator module. I've searched the web pretty well and can't fine much on 
this specific module. Or much information about the current status of Kidde 
Ovenaire Division in Charlottesville Virgina. 

The supporting PC board circuit is a good indicator of the obvious connections 
being +DC power (normal operating potential still unknown), ground and the 
oscillator output. 

Would anyone care to venture a suggestion and/or guess what the remaining 
4th available pin is for when separated from the current connection, where 
right 
now it appears to also be strapped to the +DC potential. 

And what your reasonable expected nominal operating potential for this type 
of crystal oscillator might be? 

Additional information: 

Kidde OVENAIRE Division 
Model OSC 74-14-1 
Frequency 5.00 MHz 
Serial 20009-2 
Precision Crystal Oscillator 

 Thank you in advance for your replies 

Regards, 

skipp 

skipp...@yahoo.com 

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[time-nuts] Vectron Crystal Oscillator

[skipp Isaham via time-nuts]

Hello again to the Group, 

I was handed two small 15MHz Vectron Crystal Oscillator modules. They 
are the traditional DIP IC package layout, although only 3 pins exit what 
appear to be the 1-7 row while 4 pins are presented for the 8-14 row. 

There's not much in the way of indicated part numbers, but the date code 
is 8530. 

I can apply 5Vdc to pin 14, ground to 7 and obtain the 15 Mhz output 
from pin 3.  But there is no indication or easily found data regarding the 
supply voltage requirement. 

Would anyone with hands-on experience with these smaller Vectron Oscillator 
modules be able to confirm the typical IC DIP package operating voltage to 
be 5Vdc nominal?  And what you might expect the output impedance to be? 

thank you in advance for your reply 

Regards, 

skipp 

skipp025 at yahoo com 

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[time-nuts] Trimble Thunderbolt Hard Reset

[skipp Isaham via time-nuts]

re: Trimble Thunderbolt Hard Reset 

Hello to the Group, 

The Trimble Thunderbolt through Lady Heather offers three reset options. The 
warm and cold reset are relatively intuitive. However, the third option offered 
is 
a "hard reset to factory settings". 

Would any of you be kind enough to describe the result of a return to the 
factory settings selection? 

Does/would a Thunderbolt after a factory settings reset require the entry of 
starting point operational values or does it acquire and store them during the 
course of it's normal operation. 

A recent Ebay Thunderbolt purchase appears to operate less than stellar, not 
nearly as stable as other same units. My initial impression is this unit 
operating 
with Lady Heather monitoring, exhibits notably reduced receiver sensitivity. 

Thank you in advance for your comments and replies. 

cheers, 

skipp 

skipp025 at yahoo.com 

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[time-nuts] Redundant GPSDO configuration / hardware

[skipp Isaham via time-nuts]

Redundant GPSDO configuration / hardware  

Hello to the Group, 

I realize integrated redundant GPSDO systems are available. If I wanted to 
obtain a near zero failure down time using (dual) separate GPSDO hardware, is 
there a conventional or practical method to integrate or construct a hot 
standby 
system from hardware not originally part of an integrated package/system? An 
example might be the use of different brand or model GPSDO hardware. 

If a popular method is used to integrate two separate GPSDO outputs in to 
a practical hot standby system, I would appreciate reading your suggestions 
and information. Even comments about obtaining GPSDO output for a control 
system that simply can not fail while in regular service/operation. 

Thank you in advance for your replies. 


Regards, 

Skipp 

skipp025 at yahoo dot com 

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[time-nuts] GPSDO energy consumption question(s)

[skipp Isaham via time-nuts]

Greetings Time Nuts Group Members  

A few quick questions regarding the Trimble Thunderbolt and similar GPSDO 
unit power consumption. 

I've obtained and currently use the Thunderbolt GPSDO having the case top 
power connector requiring a triple output supply. Being very happy with the 
operation and performance of the mentioned, I'd like to find one or two more. 

However, the online auction prices for the Thunderbolt GPSDO model I like have 
risen quite a bit. 

As what I thought might be a possible price and availability alternative, 
started 
evaluating the Nortel NTBW50AA GPSTM GPS Timing Module. 

The Nortel NTBW50AA GPSTM GPS Timing Module compared to the Thunderbolt 
seems to be a bit of an energy hog. I don't yet have enough information 
to do a total comparison of other available GPSDO options. 

Would any of you be able to provide a quick relative comparison about 
relatively 
common (surplus) GPSDO and similar type/function units?  their real world 
energy consumption? 

The Nortel NTBW50AA GPSTM is nice but I'm not sure we'd want to park one 
at a solar only location that didn't need what appears to be a mini space 
heater. 

Thank you in advance for your replies...  

regards, 

skipp025 at yahoo.com 
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[time-nuts] Trimble Thunderbolt CPR?

[skipp Isaham via time-nuts]

Trimble Thunderbolt CPR?  

An Ebay purchased Trimble Thunderbolt arrived DOA, it has no rs-232 output 
and I should also check the 10 MHz output soon. I'd like to have an initial 
look at a diagram to see if there are any user serviceable parts on board. 

Initial web searching suggests the schematic is not easily located. 

Would anyone have a source (even if I have to pay for it) of a diagram and/or 
any initial suggestions to trouble shoot an appearing to be dead Thunderbolt. 

I have a working Thunderbolt available for relative comparisons, sitting right 
next 
to the DOA unit. 

Again, thank you in advance for your replies. 

regards, 

skipp 

skipp025 at yahoo dot com 

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[time-nuts] Square to sine wave symmetrical conversion (part 2)

[skipp Isaham via time-nuts]

Hello again, 

First off, I want to thank everyone who replied direct and through the group 
regarding my recent 10 MHz square to sine wave conversion info request. 

I obtained a mini-circuits 10.7 MHz low pass filter from Ebay cheap 
enough and I also plan on rolling my own based on some of the information 
and links provided in your generous replies. 

Part 2: 

With things in place, I actually looked at the actual square wave output port 
with 
a decent scope to see it's not even close to being symmetrical.  The waveform 
on-portion (duty cycle) appears (surprising to me) to be much less than 20% 

Now I'm under the assumption that proper rounding or conversion of the non 
symmetrical 10 MHz square to a sine wave will be a bit more involved. 

Before I launch toward part two of this latest saga, I'd really be interested 
in reading 
suggestions and comments regarding methods to improve/fix the 10 MHz waveform 
symmetry. 

Again, thank you in advance for your replies... 

Regards, 

skipp 
skipp...@yahoo.com  


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[time-nuts] 10MHz Square to Sine Wave Conversion

[skipp Isaham via time-nuts]

re: 10MHz Square to Sine Wave Conversion  

The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like 
to convert it to a sine wave and I am looking for suggestions and info re 
any reasonable pre-made circuits and/or boards. No sense reinventing the 
wheel if I can avoid it. 

Otherwise I will start from scratch and make a new wheel  

Thank you in advance for your replies. 

Regards, 

skipp 

skipp025 at yahoo dot com 

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[time-nuts] Loran C returning to a station near you...

[skipp Isaham via time-nuts]

 Does anyone know of any other genuinely useful purpose to which the
 Austron 2100F, SRS FS700, etc receivers can be put in the US since the
 demise of Loran? 

I've heard Loran C in some form will be returning.  GPS is not jam proof and 
that 
seems to have caught the attention of our government. Although some locations 
have already been dismantled to some large degree, a hold that tiger has been 
issued as the wheels have started to turn backwards and Loran C starts to make 
a comeback. 
cheers, 
skipp 
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Re: [time-nuts] Nortel Trimble NTBW50AA GPSTM 10MHz Oscillator GPSDO

[skipp Isaham via time-nuts]

re: Nortel Trimble NTBW50AA GPSTM 10MHz Oscillator GPSDO 

Hello to the Group, 

An admitted late arrival to the group here. My initial time system launch 
revolved around 
using a Trimble Thunderbolt. 

But used Trimble Thunderbolts for sale don't appear to be as plentiful as they 
once were 
and the current prices I see on Ebay seem a bit high. 

Another option is an auction listing for the Nortel Trimble NTBW50AA GPSTM 
10MHz 
Oscillator GPSDO, aka Nortel NTBW50AA GPSTM GPS Timing Module offered for 
$159 US (plus shipping). 

Would anyone be able and willing to provide an opinion regarding the Nortel 
NTBW50AA 
modules compared to a Thunderbolt? Per an Ebay auction description, does the 
Nortel 
Module work well with Lady Heather? 

What I really need right now is the only 10MHz output. If I can get a 
comparable 10MHz 
output from the Nortel modules, fine. Else I continue on a quest to locate one 
or two 
more Thunderbolts. 

Or I'd appreciate any suggestions regarding other brands/modules comparable to 
a 
Trimble Thunderbolt. 

Thank you in advance for your replies. 

Regards, 

skipp 

skipp025 at yahoo dot com 
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[time-nuts] Thunderbolt Power Supply Suggestions

[skipp Isaham via time-nuts]

Hello fellow Time Nuts... 

I've obtained a Trimble Thunderbolt (from Ebay) and I'm in the process of 
searching out a practical power supply option. I've got the proper plug and 
pins already on order from Mouser. 

I've identified the Meanwell T-30B as a decent power supply. I like Meanwell 
power supply products quite a bit. 

Anyone have pro or con comments or alternative supply suggestions, else I 
go with the t-30b unless something else crosses my radar screen. 

Thank you in advance for your replies 

regards, 

skipp 

skipp025 at ya who period com 
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