elmerfud

i could not remember what the standard length for a futaba fm reciever antenna was... can anyone help me out>? was it 33" ?
i had one i cut to put a deans™ antenna on.....and i wanted to get it back to original length

Flyboy Dave

My Feedback: (21)

I measured one at 38" on a 148, and 39" on a 127,
both on Ch. 38....[X(]

elmerfud

thanks..... i added piece i thought* came off and i am in the 34" range... may have to add a few more....

thanks for your time

ghendrix01

My Feedback: (1)

I don't know if this helps. I measured 3 Futaba FP-R127DF receiver antennas as follows:
Ch 28 = 38.5 inches
Ch 34 = 42.5 inches
Ch 38 = 39.0 inches
I also measured a Futaba FP-R128DF receiver; CH 28 = 43 inches
These are all new receivers that I bought some time ago and have yet to be used in planes, so I know that the lengths are as received. These lengths are the wire outside of receiver, not including what is inside the receiver case.
From these lengths it appears that there is no standard length.

George

Rodney

Any thing from 38 to 41 inches will work well, the receiver won't know the difference.

Thud_Driver

My Feedback: (1)

Quarter wave length for our 72mhz freq's ranges from around 38.5" to 39" or so. Anything close to that will probably be ok. Be sure to include the length inside the receiver case when you measure.

Rodney

Our receivers are all base loaded to a degree so the 1/4 wave rule in not pertinent. The receivers are factory tuned by adjusting the inductance of the input circuitry. That is why the 35 MHZ, 6 meters etc. all use the same antenna length, anywhere from 39 to 41 inches.

charlied123

I read in a magazine article that all futabas are 39 inches.