Transmitter Question

[Tachikaze]

I am looking to get a receiver for my Ace Nautical Commander.
Some one want to explain to me the following regarding radio systems:
Negative shift
Positive shift
Dual Conversion
Single Conversion.

[AndyKunz]

Negative Shift - FM carrier is normally at the higher frequency, goes low to send the pulse to the receiver. More common method, as it is used by Futaba, GWS, Hitec, etc.

Positive Shift - FM carrier is normally at the lower frequency, goes high to pulse. Used by JR.

Dual Conversion - a method of obtaining a cleaner signal in the receiver, giving better rejection of interference. Used by most "better" receivers (this is a property ONLY of receivers - there's no such thing as a "dual conversion transmitter").

Single Conversion - Typically gives lower rejection of noise, but with good components the performance can equal a dual conversion receiver (ie, JR). This is also a property only of receivers - there are no "single-conversion transmitters."

Both single and dual conversion describe how the same signal is processed in the receiver.

From what I recall, the Ace transmitters (FM) used negative shift. They were designed by Fred Marks. If you have a deep technical question, you could try contacting FMA Direct. You should be able to use a standard Futaba-compatible receiver on the appropriate frequency without a problem.

MAKE SURE YOUR TRANSMITTER IS 1991 LEGAL!

Andy

[Tachikaze]

Thank you Andy.
What is 1991 legal?

[Umi_Ryuzuki]

Tachi,

No worries on the model 91, it was the shift from
wide band to narrow band transmitters and recievers.
Your equipment was purchased new some time after 1995