Aquarium coolers

[Andrew Thornett]

This is for discussion only.

Not recommending purchase, as, as has been pointed out in last SARA meeting, stable temperature of SDR more important than cold temperature, and that can be achieved by strapping SDR to heatsink with thermal paste.

Having said that. For sake of cooling H-Line filter and LNA, would this work? (Attached).

If you can't see the attached screenshot from Aliexpress then this is 72W aquarium cooler costing £69.

Andy

[Jon Wallace]

Hi,

Back in the 1990's I used a regular Coleman cooler and had a thermoelectric cooler inside with components... The PID cooling worked pretty good! Things were bigger and much more sensitive to temperature in those days. The LNA was on the feed horn with styrofoam surrounding it on a 10' dish...

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[Steve Berl]

The AliExpress page for this chiller says it will get to 4°-7° below ambient temperature. A review says it was only 2° (I assume these are degrees C not F).

Doesn't seem very cold.

Steve

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-steve

[Marcus D. Leech]

That chiller likely just has a TEC module inside.   Better to just use a purpose-built TEC chiller on the LNA itself, rather than dealing with plumbing.

[Alex P]

"  72W aquarium cooler "

My battery powered LNA + SDR+ SDR_Temp_Stabilization_System + USB_FiberOptic_Link averages ~ 1/10th that

"liquid cooling'"  ????

[Preston Ozmar]

Is the yellow cable a fiber-optic cable?

Thank  you,

Preston

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[b alex pettit jr]

Hello Preston,

Yes, that is a single fiber-optic cable. The unit uses 1310nm and 1550nm wavelength division multiplexing

I can set up small systems in 10 minutes.

I chose TEC cooling and Resistive heating with slow rate relay switching to minimize RFI  ( typically a few cycles per minute )

It was a pain to design, test, test, test, and finalize, but it sure is easy Now !

Alex

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[Preston Ozmar]

Hi Alex,

If you don't mind, what is the cost of the fiber-optic transceiver?

Thank you,

Preston

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[b alex pettit jr]

It runs my AirSpy mini @ 3MSPS at full speed, .. but not at higher rates.

Just plug the Rx & Tx units into the PC & Remote hardware, the units connect transparently . I've Never an issue.

Amusing Story : two weeks ago, I was testing my new Yagi design and had intended to run a 6 hr test.

Things were going  well, so I thought I'd go for a full 24.  Normally, a fully charged battery will run

over 30 hrs, but I had not 'needed' to charge for just 6 hrs.. At 18 hrs into the run, ( 2AM of course )

the PC beeped and stopped sampling. The blue power indicator on the remote box showed the battery had died.

I replaced the battery, waited a few minutes, clicked on the SDR# RUN symbol . and Everything Continued as if

nothing had happened !!       Lost ~ 1/2 hr , but the data set was Perfect 

Alex

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[Preston Ozmar]

Thank you!!! Good information.

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