Hello Piotsko sir,
I very glad to meet you, hard to find people like you who has long experiences in this old type radio system. I was feeling helpless long time back while searching information regarding this FM and PCM radio system and got no help from Futaba Japan. Whenever I used to wrote them about 72MHz their reply were always same that 72 Mhz used in USA so should contact Futaba Official USA Service. Anyway with time I came to some understanding about TYPE, this types are written on Original Crystals from Futaba only:
72Mhz:
TYPE 72-7 TX FM - Crystals ( Found in 4 to 7ch Tx)
TYPE 72-9 TX FM - Crystals (Found in 8 to 9ch Tx)
TYPE 72-10 RX DC FM/PCM - Works with FM/PCM both type of Rx models written on
Dual Conversation, e.g. R127DF, R127DP, R129DP, R138DF, R138DP, R148DF, R148DP, R149DP, R168DF, R168DP etc
TYPE 72-12 RX FM/PCM (SHORT) - Works with FM/PCM both type of Rx models, e.g. R114F, R156F, R146ip, R136F, R137F, R136HP, R137HP etc.
Don't know much about AM because never get chance to use one but noticed that all crystals marked with TYPE 72-11 are AM crystals.
In 40MHz Band:
TYPE 40-1 TX FM
TYPE 40-6 TX FM
TYPE 40-1 RX FM
TYPE 40-6 RX FM
TYPE 40-10 RX DC FM/PCM
TYPE 40-12 RX FM FM/PCM (SHORT)
TYPE 40-9 TX AM
TYPE 40-11 TX AM
TYPE 40-11 RX AM
I am always curious about all the letter and numbers written by the company on their products, sometimes they give abbreviation of those letters sometime don't. But if you ask the manufacture they behave like you have asked some secret formula or design :-D I would love to know some more details about this old radio system and all the meaning of those letters on the Rx model. Correct me if I am wrong about them. On the Rx before DF/DP/iP/DPS the first number always represent the channel numbers of the receiver but what about other numbers meaning?
R = Receiver
i = ?
F = FM
D = Dual Conversion
P = PCM
H = Helicopter (guessing only)
S = Synthesized ( e.g. R319DPS)
Waiting to learn something more from you
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Regards,
Rajib Samadder