Nice to know I'm not the only one who has had this idea.
My thinking was to use a laptop supply plugged into a socket on the
back of the TM5006 and route volts down a pair on the back-plane to
modules that need continuous power. Drive the GPSDO and ovens on the
modules that have them.
And use a couple of other pairs for USB/serial, put a USB<->GPIB and
USB hub in the empty space back around the power supply. Poof, modern
instrument. More or less. :)
Have also considered using a TM50{2,3,4} as an enclosure/basis for a
rover transverter setup.
Bob
KI2L
On Thu, Sep 16, 2010 at 4:29 PM, <[email protected]> wrote:
> It seems like it would be very tight in a single plug-in, if it even fits. A
> dual PI would certainly work though.
>
> Also, as someone pointed out, the TM-500 series may not have the power and
> cooling available. I have. TM-5006 chassis that would certainly do the job in
> both regards, but that's the last thing I would want running 24/7 in my
> shop...
>
> My LPRO found a spot in an old HP bench voltmeter chassis, and runs from a
> recycled laptop power supply (that way, the heat from the supply is not
> dissipated in the box). The installation is not complete, but I intend to
> install a small computer fan to keep the air moving through holes in the
> chassis.
>
> I will then use a modified T-Bolt Monitor to monitor the parameters from the
> LPRO, and the temperature via a front panel display.
>
> Didier KO4BB
>
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: [email protected]
> Sender: [email protected]
> Date: Thu, 16 Sep 2010 19:57:09
> To: Discussion of precise time and frequency measurement<[email protected]>
> Reply-To: Discussion of precise time and frequency measurement
> <[email protected]>
> Subject: Re: [time-nuts] LPRO101 orientation vs lock
>
>
>
> Hi Bob-
>
>
>
> I don't have the LPRO in a plugin, but I had considered it, and was wondering
> if any of those that had built one had thermal and/or lock issues.
>
>
>
> Re the sun in our valley... not this year! My tomatoes just started really
> producing and my squash and zucchini still haven't even flowered. That has
> NEVER happened to me before. A very odd year weather-wise!
>
>
>
> Dave
> ----- Original Message -----
> From: [email protected]
> To: [email protected]
> Sent: Thursday, September 16, 2010 8:07:19 AM
> Subject: Re: [time-nuts] LPRO101 orientation vs lock
>
> I assume you mean Tektronix TM5xx or 5xxx modules.
>
> I haven't seen an LPRO plugin, but considered doing one for my TM506 rack. My
> conclusion was that I couldn't get rid of enough heat without cutting custom
> fins for the LPRO.
>
> Recall that the physics package in the LPRO is the biggest source of heat,
> and looking at the unit with the connector facing you and on the left, the
> physics package is along the right side toward the rear of the unit. I
> decided the way to mount the LPRO if I had to go vertical was with the
> physics package closest to the top, to minimize the components that got
> baked. (I welcome recalibration of this opinion from more knowledgeable
> sources!)
>
> If I could cut fins for the new "top" edge, as well as a good plate for the
> bottom, and some fans, i might be able to get rid of enough heat to make it
> work. I considered mounting the LPRO to the rear of the module connectors, in
> the area containing the linear power supply components.
>
> I reconsidered on recalling admonishments in the LPRO docs and on this list
> that cesiums do not like magnetic fields! Mounting the unit next to large
> power transformers wouldn't seem to be suck a good idea...
>
> You might have better luck running it in a TM5006 rack, as they have much
> better cooling and airflow (a reason to get rid of that 506 and pick up a
> 5006!).
>
> I've had good results with my LPRO mounted on a half inch plate of T6061
> aluminum and an old AMD heatsink+fan mounted above the physics package, held
> in place with arctic silver heat transfer compound and spring-loaded wire
> clips going to the plate. I've been meaning to run noise studies to see if
> the fan causes any problems (vis a vis mag fields).
>
> Since I expect to be using the LPRO only occasionally, I've been trying to
> talk my son into making me a steampunk-themed case, something like rosewood
> with brass corners and detailing...
>
> Cheers and 73 -- Bob K6RTM in sunny silicon valley
>
>
> On Sep 16, 2010, at 2:51 AM, [email protected] wrote:
>
>> I got one of the ebay LPRO-101s about 6 months ago and played with it for a
>> while, but had problems maintaining a lock. First of all, it has a heat sink
>> bolted to the bottom that is just a little larger than the LPRO itself,
>> including being about 1.25" thick( 1" fins). Typical frequency when locked
>> is 10,000,000.007 on a 5360A clocked by a Z3801A.
>>
>>
>> Both then and now, it takes about 45 seconds to lock from cold, and will
>> stay locked for about 45 minutes. I found that in the position with the heat
>> sink on the bottom will stay locked the longest (up to a few days), but then
>> it becomes intermittent. Other positions will lock for a while, but bottom
>> down always works the longest.
>>
>>
>> For those of you who employed these in TM5xx or similar plugins, did you
>> have lock issues? Is my unit just old?
>>
>>
>> Dave
>> _______________________________________________
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>>
>
>
>
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