Originally Posted by Daemon

I use my Sunsky FOX 800 without a heat sink. Period.

ian

Doesn't yours get slightly too hot to touch? Mine does and i fear that a heatsink might infact be necessary.

I believe I also have the Sunsky Fox 800 without the heat sink, and it's been working great for me since I got it in August. It does get warm pretty quickly, but I have it mounted on top of my Hawk Sky fuselage where it gets plenty of ventilation in flight which keeps it cool enough. When ground testing I have to have a fan blowing on it.

How hot the tx becomes during operation depends heavily on the specific antenna that is used with it. Poor antennas reflect much power back to the tx, therefore it gets hotter than when it is used with a good antenna.

Yes it gets hot, even with a good antenna. But it doesn't get hot enough to
cook itself, as long as it has at least one bare side open to the air.
The FOX800 has proven itself to be a pretty solid Tx.

ian

Originally Posted by Daemon

Yes it gets hot, even with a good antenna. But it doesn't get hot enough to
cook itself, as long as it has at least one bare side open to the air.
The FOX800 has proven itself to be a pretty solid Tx.

ian

+1

mine also doesn't get enough hot to cook itself and has been working for +1 year
no heatsink being used

Anybody know if i can run a Sunsky 1.2GHz 800mw Tx on 4s (14.4V) and have any benefit like more output power?
Theo

I think that would be a bad idea.

ian

Pointless

Originally Posted by garris2

It wont have the desired effect because the internal voltage regulator will simply have to reduce the voltage even further and get hotter than before in the process.

To get more output power requires a higher output power amplifier which would require a complete redesign of the circuit. Easier to buy a more powerful transmitter. Better to put the money towards a better receiving antenna.

Thanks but i am happy as it is.
I read at a forum that this Tx can handle more than 12V and as a side effect it outputs more dB.
So there is an internal 12v regulator in there, right?
As a result it can work at lower voltages with lower output power but anything over 12V drops down to 12V creating extra heat.

I am asking because here you can see that voltage affects output power
http://www.rcgroups.com/forums/showp...64&postcount=5

If you know all that then go for it.

Its probably my English....
forget about it.
Thanks

So this FOX800 seems to have been a good (if impulsive) purchase. A few more questions, if I may:

-Is it advisable to remove the actual transmitter from the surrounding case/metal plate assembly? It seems overbuilt for my purpose. I was thinking about removing the case and gluing a CPU heatsink onto it.

-The box/manual says its 1.2 mHz (or, I guess, that's gHz?). I am looking to upgrade the antenna, probably either a Cloveleaf, a V or skewed wheel from ReadyMadeRC. (Actually--i'll probably get one of each!!). Does it matter that the ones available from that site are tuned for 1.280 mHz? Can I "custom-tune" it down to my 1.2 transmitter? Maybe selecting the higher channels on my tx/rx will help get it closer?

Originally Posted by doughpat

So this FOX800 seems to have been a good (if impulsive) purchase. A few more questions, if I may:

-Is it advisable to remove the actual transmitter from the surrounding case/metal plate assembly? It seems overbuilt for my purpose. I was thinking about removing the case and gluing a CPU heatsink onto it.

That is what i did with mine and it has been working w/o a problem for 2 years now.

Originally Posted by doughpat

-The box/manual says its 1.2 mHz (or, I guess, that's gHz?). I am looking to upgrade the antenna, probably either a Cloveleaf, a V or skewed wheel from ReadyMadeRC. (Actually--i'll probably get one of each!!). Does it matter that the ones available from that site are tuned for 1.280 mHz? Can I "custom-tune" it down to my 1.2 transmitter? Maybe selecting the higher channels on my tx/rx will help get it closer?

Channel 9 is 1280MHz so you are OK with that.
http://www.rcgroups.com/forums/showp...64&postcount=5

I'm having really crappy luck with the lawmate 1W...... Now I get no signal unless i grab the transmitter in my hand, then perfect video comes through, it's not the wires either, wiggling them gets nothing..... I worked extra hard on all my solder jobs too... Could this be a negative wire issue or something? or bad vTX AGAIN? My last one I got working but would have some drop outs when i touched it or the antenna (could be my TV responding to the static) The audio channel was dead.

Does anyone know why, when I check the Lawmate VRx I have some a crappy video, even without touching the antenna ?

Thank

Cedric