Dr.spitfire

Is is possible that i buy a different (e.g. 72MHz) Tx module for my Pcm 1024zap which am using 35MHz on... does the transmitter accept that or it is only configured to the original 35MHZ which i bought it with??

Note: it is legal in my country to use both frequencies

Phil Cole

You can use a module on any frequency band. That's the whole point of modules - the rest of the radio stays the same no matter what country you're in.

Just make sure it's designed for the 9Z. The 8U and 9C modules will fit and transmit, but the 9Z has its own module type.

Dr.spitfire

Thanx alot phil.. am really so gratefull for ur answer.
well the new thing that came in my mind is this.. Is it a must to use a dual conversion crystal on the Rx or is it to use an ordinary one??
regards,
Dr. spitfire

amcross

My Feedback: (2)

You have to use the crystal that matches the Rx. so if it is a dual conversion RX it needs a dual conversion crystal, and so on.

happy flying!

h82crash

Changing the module is not against FCC is it. I want to change mine on the 9C and Futaba says the module is tuned and no addition tuning is required, just change module, receiver crystal and go fly. True?

amcross

My Feedback: (2)

absolutely true, h82. that's the point of the modular radios is that you can change frequency -- even BAND -- without any tuning or other issues.

Dr.spitfire

hurraaaay thanx alot guys .... i finally got it and i am now gonna order the parts i need but do u know if the fp-149dp is the same as the fp-129dp coz i couldn't find the 129dp anywhere and it is the one mentioned in the catalogue of the 9z.... thanx guys
regards,
Dr. spitfire

flatfour

My Feedback: (8)

The 129 has been discontinued and the 149 is its replacement

Dr.spitfire

thanx flatfour for ur help,

one more query i have a 37 and 19 crystal on two tx modules... can i use them both on one receiver or should i buy two one high and one low... is there a real difference between them both??? howw to tell which one is which in the model shop??

thanx in advance

regards,

Amar

amcross

My Feedback: (2)

Amar,
Yes, there is a diference in howt hey are tuned at the factory. The difference is minor and assuming your radio "noise" is far lower in Kuwait than here in teh US, it is likely not going to be a problem for you. I would range check extensively with both crystals, and if you see a difference of 10% or more with the 37, then do NOT use it in the receiver, and purchase a high band rx instead.

Bax

My Feedback: (11)

One thing that was not mentioned was the fact that if you have a receiver on the 35 MHz band, you cannot change it to 72 MHz by changing the receiver crystal. You will have to purchase a new receiver. The change from 35 MHz to 72 MHz is too much of a frequency change for just a crystal to accomodate.

Even a service shop cannot change the frequency. That much of a change is well outside of the tuning range of the receiver. A complete frequency board would have to be changed in the receiver, and the parts and labor to do that would wind up at about the same price as a completely new receiver.