Author Topic: 10 MHz Everywhere!  (Read 6173 times)

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Online xrunner

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10 MHz Everywhere!
« on: April 07, 2017, 06:36:11 pm »
TheSteve started this ...

10 MHz everywhere!



It does seem to be everywhere TheSteve, it's at my house too. In fact it's all over the place here.

Is it at anyone else's house?
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Offline slurry

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Re: 10 MHz Everywhere!
« Reply #1 on: April 07, 2017, 06:43:04 pm »
It's in my house too, strange... hmmm...  :D

I run a FE-xxxx Rubidium and usually a re-purposed video distribution amplifier but now a BG7TBL distribution amplifier is used, i'm not really a time-nut so i keep it simple...for now  ^-^
 

Online TheSteve

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Re: 10 MHz Everywhere!
« Reply #2 on: April 07, 2017, 06:59:18 pm »
TheSteve started this ...

10 MHz everywhere!



It does seem to be everywhere TheSteve, it's at my house too. In fact it's all over the place here.

Is it at anyone else's house?

Clearly my distribution amplifier is working extremely well.
VE7FM
 

Offline JPortici

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Re: 10 MHz Everywhere!
« Reply #3 on: April 07, 2017, 08:45:34 pm »
I don't trust that 10.000000 (muhuahahaha)
 

Online xrunner

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Re: 10 MHz Everywhere!
« Reply #4 on: April 07, 2017, 10:14:36 pm »
I don't trust that 10.000000 (muhuahahaha)

Oh man, now I can't believe you don't trust that.  :)

How can I convince you?  :popcorn:
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Offline Brumby

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Re: 10 MHz Everywhere!
« Reply #5 on: April 08, 2017, 03:25:18 am »


That is an elegant piece of gear.
 

Offline awallin

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Re: 10 MHz Everywhere!
« Reply #6 on: April 08, 2017, 08:44:44 am »
That is an elegant piece of gear.
Don't turn it on - take it apart  :-/O
 

Offline Brumby

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Re: 10 MHz Everywhere!
« Reply #7 on: April 08, 2017, 08:51:33 am »
If you must .... but DON'T scratch the case!
 

Offline DimitriP

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Re: 10 MHz Everywhere!
« Reply #8 on: April 08, 2017, 09:58:31 am »
I don't trust that 10.000000 (muhuahahaha)

Oh man, now I can't believe you don't trust that.  :)

How can I convince you?  :popcorn:

Add more 000 :)
   If three 100  Ohm resistors are connected in parallel, and in series with a 200 Ohm resistor, how many resistors do you have? 
 
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Offline TiN

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Re: 10 MHz Everywhere!
« Reply #9 on: April 08, 2017, 11:16:24 am »
Meh, time-nuts... I don't even monitor my Rb...  :palm:
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Online xrunner

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Re: 10 MHz Everywhere!
« Reply #10 on: April 08, 2017, 03:12:12 pm »

Add more 000 :)

Hehehe - How many? I'll never be able to add enough to satisfy you - I know how this game goes.  8)
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Offline evb149

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Re: 10 MHz Everywhere!
« Reply #11 on: April 08, 2017, 04:14:38 pm »
I think I need another 3-4 "0"s here.
But, still, not bad sub-0.1ppm accuracy for the $13 counter module without tuning.
Yes, distribution amp, that's something I have to work on.


Add more 000 :)

Hehehe - How many? I'll never be able to add enough to satisfy you - I know how this game goes.  8)
 

Offline NANDBlog

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Re: 10 MHz Everywhere!
« Reply #12 on: April 08, 2017, 04:48:39 pm »
So, that means, if you connect the 10 MHz on the front, and on the back of a timer counter, than it will be 10 MHz on the screen?  :-DD
 

Online PA0PBZ

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Re: 10 MHz Everywhere!
« Reply #13 on: April 08, 2017, 05:01:54 pm »
So, that means, if you connect the 10 MHz on the front, and on the back of a timer counter, than it will be 10 MHz on the screen?  :-DD

Let me tell you a little secret: It doesn't even have to be 10 MHz  8)
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Online TheSteve

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Re: 10 MHz Everywhere!
« Reply #14 on: April 08, 2017, 05:14:10 pm »
That is an elegant piece of gear.
Don't turn it on - take it apart  :-/O

Already done! I had to see the inside.
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Offline bingo600

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Re: 10 MHz Everywhere!
« Reply #15 on: April 08, 2017, 05:40:54 pm »
That's not an "Everywhere Box"   :-//

This is an "Everywhere Box"   ;) ;)   - 8 x 5 (40) outputs  - I got mine from KJDS
.


https://www.eevblog.com/forum/testgear/fun-with-a-racal-9480-with-ocxo-40-10mhz-outputs-(8x-5-chan)/msg653659/#msg653659

http://www.ebay.com/itm/Racal-9480-10-04B-Time-and-frequency-mainframe-/401010554495

Congrats Steve - I bet it has nice specs.

/Bingo
« Last Edit: April 08, 2017, 05:42:47 pm by bingo600 »
 

Online TheSteve

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Re: 10 MHz Everywhere!
« Reply #16 on: April 08, 2017, 05:46:07 pm »
It does look pretty - but does yours accept two inputs and auto fail over to the backup input, while also accepting alarm inputs and generating alarm outputs?  :)
VE7FM
 

Offline bingo600

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Re: 10 MHz Everywhere!
« Reply #17 on: April 08, 2017, 05:54:36 pm »
It actually have a built-in ocxo (or RB) , that it switches to.
If the primary input fails (is undetected)

And it has alarms etc too ...   , yours seems like it's a "next gen" dist-amp though.

I got it because i ran out of chans. on my old distamp , now i have enough

/Bingo
« Last Edit: April 08, 2017, 05:56:21 pm by bingo600 »
 

Online TheSteve

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Re: 10 MHz Everywhere!
« Reply #18 on: April 08, 2017, 06:06:41 pm »
Mine is still from the HP era of course. I did some basic testing and its performance seems better then anything I own can measure.
It can have an OCXO fitted internally and will fail to it. I will see if I can get some good pics later. It does seem rather entertaining that a 10 MHz distribution amp would have firmware, a processor, ram, and it communicate via SCPI. I admit I have lusted after one for quite some time, I've made several lowball best offers on them over the last year or two. One was finally accepted.
VE7FM
 

Offline Red Squirrel

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Re: 10 MHz Everywhere!
« Reply #19 on: April 08, 2017, 09:04:29 pm »
Need one of these too now:

http://www.ebay.ca/itm/Symmetricom-OT-21-Officetime-Multiplexer-25413150-411-0-/272452367547?hash=item3f6f6d34bb:g:QAwAAOSwcLxYLOIz

And GPS antenna.
 
That's a different kind of "clock" though.  :P  Those GPS antennas also double as lightning rod, my coworker who was in our building when it got hit knows all about that.  :-DD 

I don't know too much about this stuff, just that it's used to sync up communication stuff, but I think they also have an NTP server built in.  Why use time.gov as a time source when you can be your own time source!
« Last Edit: April 08, 2017, 09:06:44 pm by Red Squirrel »
 

Online TheSteve

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Re: 10 MHz Everywhere!
« Reply #20 on: April 11, 2017, 04:38:07 am »
The 58502A got its own shelf.

Seems to be bang on....  >:D
« Last Edit: April 11, 2017, 05:49:21 am by TheSteve »
VE7FM
 

Offline NANDBlog

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Re: 10 MHz Everywhere!
« Reply #21 on: April 11, 2017, 09:22:18 am »
So, that means, if you connect the 10 MHz on the front, and on the back of a timer counter, than it will be 10 MHz on the screen?  :-DD

Let me tell you a little secret: It doesn't even have to be 10 MHz  8)
I dont understand time nuts. They can create voltage references, or very accurate currents, but they waste their time on time... :-//


 ;D
 

Offline Berni

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Re: 10 MHz Everywhere!
« Reply #22 on: April 11, 2017, 01:01:53 pm »

I dont understand time nuts. They can create voltage references, or very accurate currents, but they waste their time on time... :-//


 ;D

Well at least its a slightly easier hobby than being a volt nut. You can use GPS clocks to verify long term drift of your oscillators. No such thing for checking if your HP 3458A is drifting.
 

Offline Harb

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Re: 10 MHz Everywhere!
« Reply #23 on: April 11, 2017, 01:08:22 pm »
I just use a big VDA....I think it has 100 or so outputs.....10 on each euro card.
 

Online edpalmer42

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Re: 10 MHz Everywhere!
« Reply #24 on: April 11, 2017, 04:52:10 pm »
I just use a big VDA....I think it has 100 or so outputs.....10 on each euro card.

One 'trap for young players' when you convert a 75 ohm Video Distribution Amp to 50 ohms is total load.  I use a VDA that uses an Analog Devices amplifier.  It can handle 8 75 ohm outputs but only 5 50 ohm outputs.  It's not a big problem because you can daisy chain multiple inputs together.  But it's something to keep in mind.

Ed
 

Online TheSteve

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Re: 10 MHz Everywhere!
« Reply #25 on: April 11, 2017, 05:38:49 pm »
I used a modified VDA previously and the output quality was crap. Obviously they vary in quality like everything else, the one I chose was clearly junk.
« Last Edit: April 12, 2017, 02:38:06 am by TheSteve »
VE7FM
 

Offline Harb

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Re: 10 MHz Everywhere!
« Reply #26 on: April 12, 2017, 02:07:50 am »
I just use a big VDA....I think it has 100 or so outputs.....10 on each euro card.

One 'trap for young players' when you convert a 75 ohm Video Distribution Amp to 50 ohms is total load.  I use a VDA that uses an Analog Devices amplifier.  It can handle 8 75 ohm outputs but only 5 50 ohm outputs.  It's not a big problem because you can daisy chain multiple inputs together.  But it's something to keep in mind.

Ed

Yeah Mine had heaps and heaps of headroom so after the conversion it still drives all the outputs fine.......I don't use all of them though......I daisy chained all the cards together and just spread the load across all of them
 

Online DaJMasta

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Re: 10 MHz Everywhere!
« Reply #27 on: April 12, 2017, 04:21:03 pm »
I've been considering a distribution amp for a bit now, but I stumbled on a ESE ES-247E for about $30 on ebay.  It's a 75 ohm 4x6 amp (4 banks of 6 outputs), but it's got the same form factor and look as their 50 ohm variant (which is several times the price on ebay).

Well I bought one and cracked it open - uses an OPA603 on each channel, with a 15 ohm series resistor to each of the 6 outputs, very simple design overall, and the input has two connectors, one for the signal and one for a terminator.  Waiting on a set of 4 50 ohm terminators and I'll see if the opamp can handle.... but the resistors are easy-access and the chips are even socketed if they're not up to the task.  Seems like a great little unit to try and convert over.
 


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