Brian
Ideally one would use something like a Johnson counter or a Grey code
counter, decode the required outputs and then resynchronise the decoded
outputs using a set of dedicated flipflops.
Since such counters only change the state of one flipflop at a time it
is possible to avoid decoding glitc
Maybe we all could come up with a separate new board to take 10 Mhz and
give us 5 Mhz and 1 Mhz out.
Start with a buffer amp and then a decent Schmidt trigger. Feed it to a
symmetrical divide by 2 for 5 Mhz, and a symmetrical dive by 10 for 1
Mhz. These out puts could be buffered with 74AC04
Hi everybody !
Thanks for your fast answers.
If I can resume it is OK to buy the 2100F, but at a bargain price as it
may be a really tough job to bring it back to life.
Thanks also for the user's manual source, I will order it to start
troubleshooting.
Again thanks and best regards !
73 from
Hi Bruce --
Good point; I'll leave it to the software guys to figure that out. :-)
John
Bruce Griffiths said the following on 04/01/2009 06:11 PM:
> John
>
> Providing a 5MHz output will be difficult/impossible if the PIC is
> clocked at 10MHz as a pin will have to be toggled with every in
Mitch,
Ah, I can see a new TADD idea: a multi-purpose 2x multiplier
or 2x divider, or 5x and 10x too.
In your case, though, perhaps you could add a single flip-flop
to a TADD-2 to get 5 MHz from 10 MHz, the old-fashioned way.
You can't divide by two on a PIC because the minimum loop
is a couple
Tom Van Baak skrev:
>> I notice that this seller is using TVB's plots on his listing. This is a bit
>> naughty. Did he ask you Tom?
>
> No, he didn't ask. I was a little surprised too.
Me too. I saw just from the first plot that it should be one of Toms. At
least you are credited, so it is not
John
Providing a 5MHz output will be difficult/impossible if the PIC is
clocked at 10MHz as a pin will have to be toggled with every instruction.
Surely this will leave no time for executing other instructions to
produce other output frequencies?
It may be possible to do this using inline code wi
You could probably get those output frequencies with a custom version of
the PIC code. There shouldn't be any hardware changes needed, though
the circuit board layout wasn't optimized for high frequencies so no
guarantee on 5 MHz.
The PIC source code will be available, so anyone who wants to m
In your post, you mentioned that the TADD-2, will have six low impedance
outputs that can be individually jumpered to 1 PPS or 10 Hz through 10 kHz
outputs. I was wondering if there was a way to provide outputs of 100k, 1MHz
and 5MHz (assuming a 10MHz source). I am looking for a way to use a single
All,
I've just had an enquiry from a US Military T&F user in CA wanting repair
support on this product.
Odetics (Zyfer) don't support them any more.
If anyone knows of a US repair house I can point him to, I'd appreciate it.
Thanks
Rob Kimberley
Sorry, Ulrich -- just a joke! I actually wrote a lot of code in Turbo
Pascal back in the 80s, and liked it a lot. (I know that Wirth et al
never viewed the TP extensions to Pascal as valid, but they sure made it
more useful.)
John
Ulrich Bangert wrote:
> Gentlemen,
>
>> Gee, and I thou
- Forwarded Message
From: Stanley Reynolds
To: Tom Van Baak ; Discussion of precise time and
frequency measurement
Sent: Wednesday, April 1, 2009 9:11:24 AM
Subject: Re: [time-nuts] Datum / Efratom LPRO 101 - ebay
I have had mixed results with ebay, this seller has always been hel
I have had mixed results with ebay, this seller has always been helpful and
willing to make things right. But you should remember with used items
reliability will be less than new and this makes ebay a poor choice where time
is important. You should be able to evaluate any purchase as soon as p
Gentlemen,
> Gee, and I thought he was talking about Pascal. :-)
>
> John
>
Pascal = P word ??? I am a professional programmer and regulary program in a
number of different languages among them Pascal, the language that comes
after "B" and assembler for some microcontroller families. I have
> I notice that this seller is using TVB's plots on his listing. This is a bit
> naughty. Did he ask you Tom?
No, he didn't ask. I was a little surprised too.
/tvb
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.feb
Opps, my bad.:)
Chuck Harris wrote:
> Mike Naruta AA8K wrote:
>> Not to worry Ulrich, he was using a form
>> of derisive humor. He was insulting Prologix
>> as undesirable.
>
> Surely, you jest!
>
> He was complaining about PASCAL. A really bad word
> among those forced to use it.
>
> -
Gee, and I thought he was talking about Pascal. :-)
John
Mike Naruta AA8K wrote:
> Not to worry Ulrich, he was using a form
> of derisive humor. He was insulting Prologix
> as undesirable.
>
> It would be similar to referring to Microsoft
> as the M-word.
>
>
> Mike - AA8K
>
>
> Ulrich
Mike Naruta AA8K wrote:
> Not to worry Ulrich, he was using a form
> of derisive humor. He was insulting Prologix
> as undesirable.
Surely, you jest!
He was complaining about PASCAL. A really bad word
among those forced to use it.
-Chuck Harris
___
Not to worry Ulrich, he was using a form
of derisive humor. He was insulting Prologix
as undesirable.
It would be similar to referring to Microsoft
as the M-word.
Mike - AA8K
Ulrich Bangert wrote:
> Steve,
>
> after I read your mail I have been completely perplexed because I could by
> no s
Steve,
after I read your mail I have been completely perplexed because I could by
no stretch of imagination detect where you had found the aforesaid P word in
my mail. It needed the help of some English speaking friends and a search in
my last mails to find out that I have (possibly over a range o
I notice that this seller is using TVB's plots on his listing. This is a bit
naughty. Did he ask you Tom?
Robert G8RPI.
--- On Wed, 1/4/09, Eamon Skelton wrote:
> From: Eamon Skelton
> Subject: Re: [time-nuts] Datum / Efratom LPRO 101 - ebay
> To: "Nils Palm" , "Discussion of precise time an
Steve Rooke wrote:
> This man said the P word without any form of apology :-)
I know, and I am still shaking from the thought of it!
Anybody got a wooden stake?
-Chuck Harris
>>
>> It uses an easy to learn PASCAL like script language that your friend might
_
You're asking me if I can say more? Most wish they could get
me to shut up;-)
The design for the receiver of the 2100T/F is a mishmash of synchronous and
asynchronous logic. They mixed logic families in an apparent attempt to
battle a few timing problems. On one board, there is 7400, 74LS, 74L,
> Now I was wondering what about these oscillators.
> Why are they offered so cheap and so many. What have
> they be used for ?
These are from used equipment so they can't be expected
to last as long as a new unit. They are probably from
surplus telecomms equipment.
> Also I cannot find any info
Hi,
The LPRO 101 was used in cell phone systems to provide a stand-by
frequency
source when the GPS was unavailable.
As systems are made obsolete large numbers of units are being recycled
through the amateur world. They are cheap because there are more LPRO
units
than time-nuts and so are in ex
> Now I was wondering what about these oscillators. Why are they offered
> so cheap and so many. What have they be used for ?
I think they are recycled from phone or cell phone upgrades.
> Also I cannot find any information about the manufacturer on the
> internet. Are they out of business ?
This man said the P word without any form of apology :-)
73
2009/4/1 Ulrich Bangert :
> Mike,
>
> I would like to second Brent's information: That is exactly how it is done.
> Talking to the Prologix interface and talking to the NI interface is
> COMPLETELY different in that talking to the Prolog
Dear All,
I am a new in this field and need some advice.
For the adjustment of our quarz clocks we need a reference.
I came across some cheap offers on ebay for a
EFRATOM / DATUM LPRO Rubidium oscillator
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=180338976648QQssPageNameZMERC_VI_RCRX_Pr4_
Mike,
I would like to second Brent's information: That is exactly how it is done.
Talking to the Prologix interface and talking to the NI interface is
COMPLETELY different in that talking to the Prologix always means
straightforward serial communication while talking to the NI involves
DLL-calls f
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