Idea on changing the frequency

nomad · #1 08-02-2003, 01:09 PM

I have a 27MHz zipzaps car and a 49MHz clone car.
I was thinking, what if I took the crystal out of the transmitter of the clone car and put it in the zipzaps controller then take the POT out of the clone car and put it in the zipzaps car.
has anyone tried changinf the pot b4? did it work?
what if I put both POTs in the car and make a little switch and have both pots in the controller and make a little switch?
that way I can switch frequencies if needed.

if anyone has any info on this, it would be appreciated.

2fast2furious59 · #2 08-02-2003, 03:05 PM

i dont knwo if the whole 2 frequencie in one car will work but i have seen people make custom 4 frequencie controllers for 4 different cars....it wouldn't be a bad idea to do what you want but i dont think it will work liek you want it to

nomad · #3 08-03-2003, 03:36 PM

it's the crystal that tunes the frequncy of the transmitter and the coil that tunes the reciever.
if the frequency of the transmitter can be changed by changing the frequency, theoreticaly, the reciever can be changed by changing the coil.
and to change the coil, I was thinking of making sort of like a socket in the car and just plugging in the coil and a switch in the controller.
I would like to use a switch in the car, but there are too many wires that go to/from the coil, that's why I was thinking of a socket approach to changing the coil

sessiz10 · #4 08-03-2003, 04:42 PM

Try it and post your results.

Transmitter crystals can be swapped out easy.
The coil can be tuned but it's kinda tuff, an easier way would be just to swap the whole pcb out.

nomad · #5 08-03-2003, 05:22 PM

nah, I don't wanna swap the whole pcb
I wanna make a hot swappable coil
to be able to instantly change the frequency of the car and controller.
the reason I did this is becaus my friends all have different frequencies.
I can't race my friends that have 27MHz, so I decided that a hot swapable coil would be the perfect solution.
I'll post my results as soon as I'm done.

nomad · #6 08-03-2003, 05:43 PM

although it could take a while cuz I need to figure out a way to make a socket

ph2t · #7 08-03-2003, 07:33 PM

Dude, best of luck to ya but it prolly won't work. The RX stage of the circuit on the ZZ pcb has it's frequency determined by more than the inductor (you call it a coil). The inductor only varies the frequency off the main fundamental (be it 27, 40, 49Mhz, etc...) by a very small amount. So changing the coil prolly won't do that much.

The frequency is determined my several capacitors and a couple of inductors in the RX circuit.

See this thread at ausmicro for more info:

http://www.ausmicro.com/topic.asp?TO...+%2D+Technical

Best of luck to you!

ph2t.

nomad · #8 08-03-2003, 08:45 PM

hmmm...
mabe you're right
too bad recievers didn't use a crystal

nomad · #9 08-03-2003, 08:46 PM

do you know of a way to change a 27MHz car to 49MHz?

2fast2furious59 · #10 08-03-2003, 09:24 PM

pcb swap would do it

2fast2furious59 · #11 08-03-2003, 09:29 PM

well since your doing this in a zip i just had an idea...i doubt this is even logical and if i had two zips i would try it but i dont even have one for now...
ok heres what i was thinking....get a 49mhz and a 27mhz zip....take a pcb out of one and leave the other one in the car it is in...then take the one you removed from a car and solder all the steering wires to where they go and then solder everything up to it but you'll have two pcb's in it...then somehow rig up a micro switch in there so you can switch between the two pcbs and then get yourself a pt cruiser body and slap them in tehre and drill an extar hole out the back so you can have dual antennas but you can also have dual pcb's...

i doubt this will even work but i need to research about the zip pcb's if i have ne luck researching i will get back to you guys wit an answer

nomad · #12 08-14-2003, 08:01 AM

I was thinking of doing that, but I can't get a zipzaps pcb cuz I'm in Canada
I'd have to use the crappy cars that Canadian radio shacks sell.
plus it'll be kinda hard to fit a second pcb and a switch and still be able to get the body on normally without a lot of chasis modificatons.
I don't think it'll be too easy changing the freq of the controller either.
I tried making it have 2 crystals and a switch, it didn't work.
I had a 27 and a 45 crystal, the car worked on both crystals.
I think that the coil in the controller might have something to do with setting the frequency.