cooling for lnb.

[danristheman]

here is my idea on how to cool the geosat pro pll lnb. sorry for the bad hand writing use a heater core from a 1987 dodge charger should work it can be controlled by your receiver insted of depending on an out side power source. Plus mike and wally I got cozi tv to come in its not a bad channel to watch.

Dan Rose

 

[wallyhts]

here is my idea on how to cool the geosat pro pll lnb.<img src="http://www.satelliteguys.us/attachment.php?attachmentid=87736"/><img src="http://www.satelliteguys.us/attachment.php?attachmentid=87737"/><img src="http://www.satelliteguys.us/attachment.php?attachmentid=87738"/> sorry for the bad hand writing use a heater core from a 1987 dodge charger should work it can be controlled by your receiver insted of depending on an out side power source. Plus mike and wally I got cozi tv to come in its not a bad channel to watch.

Dan Rose

Cool man. Are you going to build test sounds like a cool idea.

 

[FaT Air]

I was thinkin'(Oh-Oh ???) a little more technical. A thermoelectric generator module (tegpower.com?) feeding electricity to a solid state cooler(http://en.wikipedia.org/wiki/Thermoelectric_cooling).
But why? Is there thermal issues you're experiencing. The last time I had real 'thermal issues' was a 15 yr old LNB that would just up and quit if outside temps went above 80-85 for more than an hour.

 

[SatelliteAV]

I would concentrate efforts at achieving performance gains to chill a LNBF to sub 0 degrees Celsius. Reducing the ambient operating temperature to a consistent 50 or 60 degrees would help a DRO LNBF maintain a more stable LO frequency, but would yield little performance gains.

 

[updatelee]

Are you trying to lower the noise or increase the stability?

Cooling it to sub zero and maintaining a stable temp will lower the noise and increase the stability but at a very expensive cost. A quality DRO will have a better stability and lower noise without going to the work of improving the geosat.

raising the temperature and maintaining a stable temp will increase the stability and lower the phase noise a tiny bit but probably increase the gain noise, but much cheaper. But still nothing a quality DRO cant outperform.

Quality DRO's can maintain 150khz stability easily, there are even some that are better. a DRO will always have a lower phase noise then a PLL. If you need sub 1khz stability (satellite tv can handle 100x worse no problem) then you jut dont have any options, and a PLL is the only way.

Its a fun project, but your not really going to see alot of gains for the amount of work your doing.

Now if you take a high quality DRO and cool that, now you can see some gains. There was an interesting article I read years ago, cant find it anymore, I think it might have been in tele-satellite about cooling a DRO

UDL

 

[danristheman]

It was just an idea I wanted to pass along to you guys to see what you thought. Insted of an outside power source like solar or wind try using what you have like the power from the receiver.

dan rose

 

[wallyhts]

It was just an idea I wanted to pass along to you guys to see what you thought. Insted of an outside power source like solar or wind try using what you have like the power from the receiver.

dan rose

I like the idea Dan. Keep them coming buddy.