[time-nuts] LPRO-101

[Gerald Molenkamp]

Hi all,

FYI. Last weekend my LPRO-101 decided to give up after 6 years of non-stop 
service in the shack. The symptom was no 10MHz output. I checked all required 
regulated voltages, all appeared well.

I started to prod and poke around the 20MHz VCO area and found that the 
slightly touch of a wet fingertip kick started the 20MHz VCO. I recall reading 
Fred ( PE1FBO ) repair guide some years back, He had mentioned failed 100K 0603 
resistors.

As it turned out, I ended up replacing 7 x 0603 100K resistors on the base side 
of the PCB, most measured well in the mega ohms. All other resistors appeared 
to be as normal as you could measure in circuit.

Very pleased with the LPRO-101 given the age of my unit (15 years old) , and 
the lamp voltage is healthy 8.3 volts.

Regards


Gerald

VK3GJM














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[time-nuts] Fwd: sysclock source for AD9912 DDS?

[Gerald Molenkamp]

Look up PA3AKE, he built a 1 GHz source clock, Martein also provides a 
substantial amount of research data.

Good luck for the new year.

Gerald

VK3GJM

Sent while out and about

Begin forwarded message:

From: Anders Wallin 
mailto:anders.e.e.wal...@gmail.com>>
Date: 31 December 2013 2:56:03 AEDT
To: Discussion of precise time and frequency measurement 
mailto:time-nuts@febo.com>>
Subject: [time-nuts] sysclock source for AD9912 DDS?
Reply-To: Discussion of precise time and frequency measurement 
mailto:time-nuts@febo.com>>

I've tested the AD9912 evaluation board:
http://www.anderswallin.net/wp-content/uploads/2013/12/dds_test_2013-12-30.png

I want to use it with a 10MHz external input clock, but it looks like the
on-board PLL that generates a 1200MHz sample clock from my input isn't that
great, since I get strong side-bands on the output that are only 18-20 dB
down from the fundamental.

So it looks like I need to supply a clean 800-1000MHz clock to the DDS to
get a clean output. Any ideas/suggestions for generating this from a 10 MHz
sine?
Driving the DDS system clock from an expensive RF generator (e.g. HP 8648A)
would be possible but I'd prefer a PLL from 10MHz if it's doable
simply/cheaply.

Anders
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[time-nuts] Fwd: Nifty "MINI TIC" for DMTD work

[Gerald Molenkamp]

Count me in for A kit.

Regards

Gerald
VK3GJM

Sent 
> Subject: [time-nuts] Nifty "MINI TIC" for DMTD work
> Reply-To: Discussion of precise time and frequency measurement 
> 
> 
> As Bert mentioned once the amount if interest is established purchase
> details will post.
> 
> We also will post a FAQ for this project.
> 
> Thanks,
> 
> Corby
> 
> The New "Skinny" Fruit
> How This Strange 62-Cent African Fruit Is Making Americans Skinny.
> http://thirdpartyoffers.juno.com/TGL3141/50aa9366d74d913667845st04duc
> 
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[time-nuts] Fwd: FE-5680A Contact FEI

[Gerald Molenkamp]

I have written to them on several occasions about 56

Sent via Gerald's iPad

Begin forwarded message:

> From: Peter Gottlieb 
> Date: 16 February 2012 10:58:10 AEDT
> To: Discussion of precise time and frequency measurement 
> Subject: Re: [time-nuts] FE-5680A Contact FEI
> Reply-To: n...@verizon.net, Discussion of precise time and frequency 
> measurement 
> 
> I haven't personally tried but others have reported they were somewhat less 
> than cooperative.
> 
> Peter
> 
> 
> On 2/15/2012 6:23 PM, Bill Riches wrote:
>> Just curious,
>> 
>> Has anyone on this list actually contacted FEI and enquired about a
>> schematic or other info about our 5680 units?  They are still being sold by
>> them.
>> 
>> 73,
>> 
>> Bill Riches, WA2DVU
>> Cape May, NJ
>> 
>> 
>> 
>> 
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>> 
>> -
>> No virus found in this message.
>> Checked by AVG - www.avg.com
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[time-nuts] Oscilloquartz 5240 GPSDO

[Gerald Molenkamp]

Hi All,

 

If anyone is ever in need of Local Management Software for the OSA 5240,
drop me a private mail.

 

Great unit at Zero cost. After config the 3RU case is equipped with 16 x
BNC outputs at 10MHz 1VRMS into 50 Ohm.

 

Regards

 

Gerald

 

VK3GJM

 

 

 

 

 

 

 

 

 

 

 

 

 

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[time-nuts] Oscilloquartz 5240

[Gerald Molenkamp]

Hi All,

 

I have acquired a new, never used Oscilloquartz 5240 GPS GPSDO with a
bunch of options.

 

Access to the unit is via a Local Management craft terminal client that
resides on your PC called OSA LM/LM Pro. I have spent several days
looking for a downloadable copy without success. 

 

Would anyone have this specific 5240 software they would like to share.

 

Thank you in advance.

 

Regards

 

Gerald

 

VK3GJM

 

 

 

 

 

 

 

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Re: [time-nuts] the end of light bulbs as we know it was Re: Safe power-up. was (Solartron 7075 ...)

[Gerald Molenkamp]

Hi Hal,

Good timing, good point. Just got home, switched on radio to look at 1300MHz rx 
signal strength, it is clean up there. Thunderbolt works fine here.

Noise is from crude switcher with almost no filtering.

Regards

Gerald
VK3GJM

On 12/10/2011, at 17:25, "Hal Murray"  wrote:

> 
>> Now to the negative part , noise floor from around 21MHz to well over 500MHz
>> raised to a signal strength 5 to 6 across mid to upper HF / lower VHF to
>> upper UHF with them switched on, otherwise my noise floor is Zero.
> 
>> Lower VHF  to UHF SSB/FM low level signal work is now not possible when LEDs
>> are on, mostly at night when we enjoy the hobby. 
> 
> What is causing that trash/EMI?  Switching power supplies?  PWM?
> 
> How much gets up to 1.4 GHz?  (GPS)
> 
> 
> 
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
> 
> 
> 
> 
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Re: [time-nuts] the end of light bulbs as we know it was Re: Safe power-up. was (Solartron 7075 ...)

[Gerald Molenkamp]

Hi All,

Sorry Tom, worth a mention.

I replaced all of my down lights after my Kids wanted us to contribute
to lowering our carbon footprint. On the positive side, moving to LEDs
will provide savings around $107/year in electricity charges.



Now to the negative part , noise floor from around 21MHz to well over
500MHz raised to a signal strength 5 to 6 across mid to upper HF / lower
VHF to upper UHF with them switched on, otherwise my noise floor is
Zero.

Lower VHF  to UHF SSB/FM low level signal work is now not possible when
LEDs are on, mostly at night when we enjoy the hobby.

The net effect of dirty LED lighting has long term issues with sensitive
receivers.

Regards

Gerald

VK3GJM  






There is one angle that was not covered, but which is relevant (at least
to those of us using any LF or HF time receivers).

Over the weekend I bought my first LED bulb.  It was on sale and I
wanted to see how it worked.  On the package it gave a warning that it
could interfere with HF communications in the 0.45 - 30 MHz range and to
not install it near any maritime emergency communications equipment.

Peter


On 10/11/2011 6:56 PM, Tom Van Baak wrote:
> This thread is wonderful, nostalgic, technical, futuristic, and 
> appropriate for someone's list. But not time-nuts. Please stop it now.

> Don't reply.
>
> /tvb


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[time-nuts] Nano Gyroscope

[Gerald Molenkamp]

Hi All,

Time, GPS and movement plays a big part in most discussions. Each day
brings something new and fantastic in the world of science, it just
makes you think where it will take us.

http://www.physorg.com/news205500249.html 

 

Regards

 

Gerald

 

Vk3GJM






 

 

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[time-nuts] Wenzel 245MHz OCXO Low noise power supply and mounting environment

[Gerald Molenkamp]

Hi All,

 

I recently purchased a Wenzel 245MHz OCXO from ebay. It appears to work
very well and shows good stability after 2 weeks on the bench.

 

I would like to use it as the primary reference for a DDS 1st Lo in my
homebrew HF transceiver. I have come to the conclusion the unit requires
a very low noise 9 volt supply to ensure the phase noise is kept
controlled around the spec.

 

Although I am not able to measure phase noise, ensuring the unit is fed
with a clean supply can only be good. I looked at the Wenzel Finesse
approach, this article all makes sense and confirms my view the need for
an exceptional low noise supply.  

 

I have noticed environmental changes/package temp stability is quite
sensitive, the block is only 2" square therefore not a lot of mass, even
handling the package shows drift +/-  5 to 10 Hz. I am thinking the best
option is to box up the OCXO and low noise power supply in a Diecast
box, insulated with Styrofoam to ensure external excessive temperature
swings do not affect the package, however I am open to any suggestion.
This is similar to the double skin 10811. 

 

I am not able to measure Phase Noise as per spec, I am looking for
assistance from this group on the best method for measuring phase noise
and stability using what equipment I do have in my Lab. I have a
TDS2022B with FFT, HP 53131 and Tek492BP. My standard's reference is
one of Tom's Thunderbolt with John's mods ( 10811 ) and a good quality
linear power supply.

 

Regards

 

Gerald

VK3GJM

 

Gerald Molenkamp
CTO - Director 

 

 

CommTel Network Solutions Pty Ltd
46 Ovata Drive. Tullamarine. Victoria. Australia. 3043
T. +613 9330 4722  /  F. +613 9330 4277  /  M. 0408 544 657

ServiceDesk. 1800 99 78 76
E. gera...@commtelns.com  /  W. www.commtelns.com

 

 

 

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[time-nuts] Are the days of buying a crystal numbered?

[Gerald Molenkamp]

Hi All,
 
Found this interesting device last week while looking for a basic PLL to
replace a crystal for an IF offset. Has anyone experimented with the
si570/si571 yet?
 
www.silabs.com/Support%20Documents/TechnicalDocs/

Si570.pdf
 
Regards
 
 
Gerald
 
VK3GJM
 
 

 

 
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Re: [time-nuts] Frequency counter recommendations

[Gerald Molenkamp]

Hi All,

For over 12 years I have been running a HP53131 12 digit counter and the 
freeware Agilent IntuiLink Connectivity Software via an old NI IEEE-488 GPIB to 
Ethernet.

>From a functionality point of view it is by far the best counter I have used. 
>Coupled with Intuilink S/W in EXCEL as an add-ins, graphs, long term 
>statistics and drift performance can be presented easily. I recently installed 
>a HP10811 as an after market add-on,  as a portable device it's now as 
>accurate as any portable counter can be.

Although the 53131 with no options is limited to 250 MHz, my next project is a 
channel C prescaler that will take the unit to 3GHz or beyond.

If any one has added a home brew Channel C, please let me know how it turned 
out.

Regards

Gerald


 
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Re: [time-nuts] HP10544a Technical Info needed

[Gerald Molenkamp]

Hi Bruce,

You are right. I havn't checked my unit against the schematic at all. It is 
well secured calibrated and operating in my HP 5342 operating well within 
the specifications. The scanned schematic came from Leapsecond a few years 
ago, and I have not had to use it as yet. Lets hope it stays that way.

Cheers

Gerald


- Original Message - 
From: "Dr Bruce Griffiths" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement" 

Sent: Saturday, February 03, 2007 3:01 PM
Subject: Re: [time-nuts] HP10544a Technical Info needed


> Gerald Molenkamp wrote:
>> Hi Howard,
>>
>> Please find attached a schematic of the 10544, hope it helps in anyway.
>>
>> Regards
>>
>>
>>
>> Gerald
>>
> Gerald
>
> The connection of the 10K oven monitor resistor R12 in the schematic is
> incorrect.
> In this position only the very small deviations in the oven supply
> voltage due to its finite output impedance will be seen as Q4 turns on
> and off.
> The resistor should surely be connected to the junction of the
> darlington (Q4) emitter and the oven heater winding resistor??
> The datasheet clearly states that the duty cycle of the oven monitor
> varies, as is seen with working 10544As.
>
> Bruce
>
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Re: [time-nuts] OT: RoHS crap

[Gerald Molenkamp]

Hi Poul,

I think your point of view is correct.

I manufacture Fibre based GE + TDM Telecommunications products sold to the 
European and Asia market with exceptional reliability to operate within the 
Power industry. They demand 99.999% availability end to end and devices with 
time deterministic parameters for operating fail safe and protection 
signalling systems.

As we speak/type, much of the old generation equipment is being replaced by 
very new cutting edge electronics with endless functionality. This causes 
massive disposal problems in Europe, Australia and many other countries that 
are just starting to realise the impact hazardous waste has on the ground 
water, irrespective if you have a large land mass or not.

Our business has to-date spent a small fortune changing all our design & 
production facilities to meet with RoHS 5 and by the end of the year RoHS 6. 
However I can not say the same for many first world Countries, who wish to 
continue to dump their so called compliant stock on the market.

Actually we are so far ahead, we are winning business because of the leap in 
compliance and further more it has made us realise that RoHS is a perfect 
opportunity to totally enhance our products using the latest semies, thus 
future proofing them for the next 5 years, 2 to 3 years ahead of our 
competitors. It is amazing what one can do when pushed.

RoHS 5 is an interesting mandate, Lead based solder can still be used as 
long as the components are a mixture of RoHS and not, RoHS 6 must comply 
will 100% lead free components and solder process. Both work well, infact we 
have GE fibre based system in place operating to +60 Degrees C, these items 
have been in service for 2 years +. A recent Audit did not show any yield 
issues.

I think it is time that all first world Countries cleans up their act, 
hopefully this will leave a better place for our children and children's 
children, I am all for it.

Please take a moment to review the following:-

http://www.rohsguide.com/?gg=us&kw=rohs%20compliance&gclid=COayjM_k5IkCFQloYAodqWjeGw


Happy soldering.

Gerald


- Original Message - 
From: "Poul-Henning Kamp" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement" 

Sent: Tuesday, January 16, 2007 5:49 PM
Subject: Re: [time-nuts] OT: RoHS crap


> In message <[EMAIL PROTECTED]>, Chuck Harris writes:
>
> Chuck, you are entitled to your opinions, but some of your
> assumptions indicate that you havn't been in Europe for
> any amount of time, so I'll just correct those of of your
> mistakes that applies to over here:
>
>>Oh darn!   Another toothless regulation.
>
> Calling anything with a 99.9% success rate toothless is stupid.
>
>>Incinerators are a perfect place to scrub these metals out of the
>>waste stream.  Perhaps we need to perfect the pollution controls
>>on incinerators? ...or better still, eliminate incinerators?
>
> Europe does not have vast tracts of land we can use for landfills,
> and we care enough about the oceans to not just dump our shit
> unfiltered into them.
>
>>That logic doesn't follow:  The lead in gasoline was by design destined
>>to enter the atmosphere.
>
> No.  Originally it was argued that it would deposit inside the
> exhaust and be eliminated/recycled along with the car.
>
> Then much later on, independent researches found lots of lead in
> city smog and only after they directly proved its heritage did Ethyl
> Corp admit that "could be a possibility" and that they never really
> researched it in the first place.
>
>>The only reason lead was taken out of gasoline was to
>>facilitate catalytic converters, and smog reduction.
>
> No.  The reason lead was taken out of gasoline was to reduce
> the amount of lead in childrens blood.
>
>>> Finally I'll cordially remind you gentlemen that there were similar
>>> dire predictions when gasoline additives where changed from alcohols
>>> to ethyl-lead and again when ethyl-lead was banned.
>>
>>Of course cars now cost 5 to 10 times as much as they did in 1976 when
>>lead was banned from gasoline in the US.  In the US, this fact keeps a
>>lot of very old, and marginally safe cars on the road.
>
> And ?  Would it have been better to keep polluting our kids with lead ?
>
> Or are you saying that cars are 5 to 10 times as expensive because
> of the catalytic converter ?
>
> Anyway, it's hard to take seriously any complaint about cars from
> a country where the most asked for extra feature is the roof mounted
> machine-gun for the hummer :-)
>
>>> (Who will use SnPb solder until he runs out, probably 10 years from 
>>> now.)
>>
>>I'm sorry Poul, if you use that Sn/Pb solder, knowing what you *know*,
>>then you are a hypocrite.
>
> No it isn't.
>
> I bought my current roll of solder four years ago and you can still
> barely see that I've used any of it, so the amount of lead we are
> talking about is vanishing small (hence the 10 years).  Furthermore
> the resulting constructions only leave my lab for certif

[time-nuts] 492BP chassis heat.

[Gerald Molenkamp]

Oops,

Please ignore, wrong forum.

Cheers
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[time-nuts] 492BP chassis heat.

[Gerald Molenkamp]

Happy new year to you all.

After quite a number of positive replies to the issue of 492BP chassis heat, I 
am satisfied that it is fine. 

John, thanks. I did see the thermal switch today, it is also 103 Degrees C down 
here. My new years resolution is to take John's advice, ( Quit messing with it 
and have fun using it. :-) 
  
Thanks for the assistance.

Cheers

gerald
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Re: [time-nuts] Looking for TCXO data

[Gerald Molenkamp]

Hello again Peter,

Thank you for the links. Just powered it up and it works fine and shows 
10MHz. I will leave it running overnight.

Happy new year.

Gerald



- Original Message - 
From: "Peter Vince" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement" 

Sent: Saturday, December 30, 2006 8:43 PM
Subject: Re: [time-nuts] Looking for TCXO data


> Hello Gerald,
>
> You're in luck! I bought a similar one from ebay this time
> last year, and the vendor sent me a MuRata catalogue.  It is 992 KB,
> so I've put it on my website:
>
> http://www.barney-wol.net/private/MuRata_oscillators.pdf
>
> Your OC2545 is on page 21 (the 23rd page of the document!). You might
> be in luck again, as it says standard frequencies were 10 and 12 MHz,
> and the "1000" is just a number assigned by the factory.  The D
> suffix means 12 volts, and the T means TTL output levels (that isn't
> mentioned on the 2545 page, so is perhaps unusual, but is defined on
> page 6 - Part Numbering)
>
> Happy New Year,
>
> Peter
>
>
>>I recently picked up a TCXO from Murata, part No. OC2545DT-1000. I
>>assume it is a 1MHx XO. Quite small in size fully sealed square
>>metal case, with 8 pins arranged as 2 sets of 3 pins and 2 single
>>pins.
>>
>>Would anyone have any data, even just pin-outs for the device as
>>pictured.   Did a google and nothing.
>>
>>Happy new year to all.
>>
>>Gerald
>
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Re: [time-nuts] Looking for TCXO data

[Gerald Molenkamp]

Hi Rob,

I came up with the same results, but no links to data. Most hits are selling 
surplus stock.

I did spent 2 hours trolling through many sites hoping to pick up something.

Thanks for looking.

Gerald

- Original Message - 
From: "Rob Kimberley" <[EMAIL PROTECTED]>
To: "'Discussion of precise time and frequency measurement'" 

Sent: Saturday, December 30, 2006 7:37 PM
Subject: Re: [time-nuts] Looking for TCXO data


> Gerald,
>
> I did a search on Google using  OC2545DT-1000  (excluded Murata) and found 
> a
> lot of results, although all seem to be companies selling product. There 
> may
> be a link or a further contact if you dig deeper.
>
> Rob
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> Behalf Of Gerald Molenkamp
> Sent: 30 December 2006 04:25
> To: time-nuts@febo.com
> Subject: [time-nuts] Looking for TCXO data
>
> I recently picked up a TCXO from Murata, part No. OC2545DT-1000. I assume 
> it
> is a 1MHx XO. Quite small in size fully sealed square metal case, with 8
> pins arranged as 2 sets of 3 pins and 2 single pins.
>
> Would anyone have any data, even just pin-outs for the device as pictured.
> Did a google and nothing.
>
> Happy new year to all.
>
> Gerald
>
>
>
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[time-nuts] Looking for TCXO data

[Gerald Molenkamp]

I recently picked up a TCXO from Murata, part No. OC2545DT-1000. I assume it is 
a 1MHx XO. Quite small in size fully sealed square metal case, with 8 pins 
arranged as 2 sets of 3 pins and 2 single pins. 

Would anyone have any data, even just pin-outs for the device as pictured.   
Did a google and nothing.

Happy new year to all.

Gerald<>
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Re: [time-nuts] Lucent RFG-M-RG and XO

[Gerald Molenkamp]

Hi Richard,

Thanks, your explanation sounds right from memory.

However, I am somewhat amused at the complexity of the XO, given it's 
otherwise simple task. Maybe it is just over engineered, and there is no 
other function other then your explanation. Currently my XO serves as a good 
paper weight.

Hopefully in time, this forum will flush out more detail on the RG and XO 
set.


Gerald




- Original Message - 
From: "Richard H McCorkle" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement" 

Sent: Friday, December 29, 2006 6:44 AM
Subject: Re: [time-nuts] Lucent RFG-M-RG and XO


> Back when these Lucent units were first appearing GPS had not yet been
> implemented at the cell sites here in Alaska. The rubidium was too noisy 
> for
> direct frequency synthesis, so the XO unit was phase locked to the 
> rubidium
> to provide the long-term stability needed, and the XO output was
> up-converted for the system clock. By using the XO to smooth the rubidium
> output the phase noise in the system clock was reduced due to better
> short-term stability in the XO. As I remember it (It's been a while) the 
> 10M
> Rb disciplined the 10M XO, which was divided by 2, multiplied by 3,
> filtered, and supplied as the 15M system clock. The XO was always 
> supplying
> the 15M system clock, and "standby" just meant the XO was locked to the
> rubidium, which was acting as the primary frequency reference. When the
> rubidium failed the system alarm output went high, XO PLL went into hold,
> the standby light on the XO extinguished, and the undisciplined XO became
> the source until the rubidium could be replaced. The GPS connection didn't
> appear until later units and disciplined the XO during normal operation,
> with failover on extended GPS loss to disciplining the XO from the 
> rubidium.
> Hope this helps in figuring out the why of the system connections.
>
> Have Fun!
> Richard
>
>
> - Original Message - 
> From: "John Ackermann N8UR" <[EMAIL PROTECTED]>
> To: "Discussion of precise time and frequency measurement"
> 
> Sent: Thursday, December 28, 2006 4:51 AM
> Subject: Re: [time-nuts] Lucent RFG-M-RG and XO
>
>
>> Thanks for the information, Gerald.
>>
>> Could the fault light without 10MHz input be as simple as the system
>> reporting failure of the Rb?  i.e., the XO unit working OK, but just
>> reporting that the system wasn't operating properly.
>>
>> Like you, I'm having trouble sussing out just why this thing is designed
>> as it is, which oscillator is primary, and why...
>>
>> John
>> 
>>
>> Gerald Molenkamp said the following on 12/28/2006 06:27 AM:
>> > Some 5 years ago I recovered one of each, ( RFG-M-RG & RFG-M-XO ) from 
>> > a
> Lucent CDMA BSC site here in Australia. Both units were only 12 months 
> old,
> at that stage inter-connected via the J5 "interface" 10MHz out to 10MHz in
> from the RG to XO respectively and of course 24 VDC.
>> >
>> > After some reverse engineering of the BSC, I never understood the 
>> > reason
> for the REG-M-XO in the BSC as it required a 10 MHz input from the RG for 
> it
> to operate properly, e.g. the fault LED off. The 15 MHz signal is the
> synthesiser reference output that is fed into the BSC radio, 
> synchronisation
> then propagates through the CDMA network, which I assume is used as one of
> many Primary Reference clocks ( PRC ) for the network of many BSC's. My
> assumption is that the XO is used as a back-up PRC in the event of RG
> failure, or as part of the hold-over system, but this was questionable.
>>
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[time-nuts] Lucent RFG-M-RG and XO

[Gerald Molenkamp]

Some 5 years ago I recovered one of each, ( RFG-M-RG & RFG-M-XO ) from a Lucent 
CDMA BSC site here in Australia. Both units were only 12 months old, at that 
stage inter-connected via the J5 "interface" 10MHz out to 10MHz in from the RG 
to XO respectively and of course 24 VDC. 

After some reverse engineering of the BSC, I never understood the reason for 
the REG-M-XO in the BSC as it required a 10 MHz input from the RG for it to 
operate properly, e.g. the fault LED off. The 15 MHz signal is the synthesiser 
reference output that is fed into the BSC radio, synchronisation then 
propagates through the CDMA network, which I assume is used as one of many 
Primary Reference clocks ( PRC ) for the network of many BSC's. My assumption 
is that the XO is used as a back-up PRC in the event of RG failure, or as part 
of the hold-over system, but this was questionable.

For as many years as I have had both units, I have tried to obtain specific 
module data from vendors down here, but unfortunately none is available. 
However the LPRO Rubidium unit with-in the RFG-M-RG unit is an absolute ripper 
on it's own.

I do have the following pin-out data for the interface J5 from the RG to XO:-

RB DB9 Pin No.XO DB9M Pin No.

15
33

RG & XO P1 DB9 power connector

1+24vdc
20 vdc


The RG requires approx. 1.3 A @ +24vdc at start-up, the current drops to 
approx. 600mA. The XO requires 300mA, but drops slightly after warm-up.

If any one has more data, please let the audience know. I am keen to understand 
the need for a Rubidium PRC to disciple an oven controlled oscillator ( XO )?

Gerald

 

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[time-nuts] Frequency Electronics FE-5650A

[Gerald Molenkamp]

Hi, 

Help needed.

I am seeking detailed technical information "schematics if possible" for the 
FE5650A Rubidium frequency oscillator

I have 2 units, both have failed in the same manner, and are suffering from no 
lock and over heating.

Have now spent a solid month fault finding both units, I am now desperate for 
any help.
 
 

Regards

Gerald

Melbourne Australia
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[time-nuts] Frequency Electronics FE-5650A

[Gerald Molenkamp]

Hi All,

I am seeking detailed technical information "schematics" on the FE5650A 
Rubidium frequency oscillator??

Both units have failed in the same manner, no lock and over heating.

I am willing to pay for a hard-copy, soft-copy via CD or even to download.  

 Regards

Gerald
Melbourne Australia
  
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