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11-09-2005 02:20 AM  14 years ago
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new heli pilot

rrNovice

eagle river, alaska-united states

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receiver
I am using a new futaba pcm 146 reciever. I just got it back from futaba because it had a cut antenna. I put it in my t-rex and I am not getting any response. I am using a 7 channel futaba radio and I did switch the modulation to pcm. On my esc, the light blinks, so I know that the heli is getting power. Any idea on the cause?
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11-09-2005 03:03 AM  14 years ago
dkshema

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Cedar Rapids, IA

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If they shipped it back to you with a crystal in it...did they send it back with the same channel that you had when you sent it in?

Dave
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11-09-2005 05:40 AM  14 years ago
new heli pilot

rrNovice

eagle river, alaska-united states

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what is a dual conversion and a single conversion crystal? How do I tell the difference?
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11-09-2005 05:50 AM  14 years ago
Emptyrage

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Las Vegas, NV.

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I recently got my 146iP back from Hobby Services. It was fine and they installed a stock futaba antenna on it. I had the mini map antenna but after reading an article about antennas, I would rather keep my antenna original and unwound. Anyway I was using a dual conversion crystal and a Hitec single conversion that both didn't work. I didn't try Futaba's single conversion rx set. Just be sure to use a genuine Futaba single conversion crystal rx part no. 72-12. It is a high and low band reciever.Empty
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11-09-2005 06:14 AM  14 years ago
Emptyrage

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Las Vegas, NV.

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Here is a link to futaba page with crystal info. The 146iP uses these 72-12 FM RX short crystal.

http://www.futaba-rc.com/radioaccys/futl20.html

As for the difference between a dual and single conversion crystal. I found a definition for dual conversion in Futaba Glossary but not single. In the past I did stumble on info for single conversion somewhere just can't find it at the moment. Hope this helps.
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11-09-2005 01:10 PM  14 years ago
dkshema

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Cedar Rapids, IA

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The major difference between a dual and single conversion crystal is the frequency they operate at when in their application.

The crystals are all the same material, same manufacture process, just that due to the way a dual conversion radio works, the one you buy to plug into the socket on the receiver operates something like 10 megahertz higher or lower than the actual frequency of the channel, the one you buy for a single conversion receiver operates usually 455 kilohertz above or below the receiver's desired channel.

The entire explanation can be kind of overwhelming if you don't have an electronics background.

Dave
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11-10-2005 05:36 AM  14 years ago
new heli pilot

rrNovice

eagle river, alaska-united states

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So do I use regular size or micro size crystals?
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11-10-2005 05:48 AM  14 years ago
dkshema

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Cedar Rapids, IA

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Use Futaba single conversion "short" crystals:

FUTL62** FM Short Rx Crystal 72MHz Low (FUTL6211-35)
FUTL63** FM Short Rx Crystal 72MHz High (FUTL6336-60)

the "**" in the numbers above represents the channel number.

Channel 59 would be FUTL6359
Channel 12 would be FUTL6212

Dave
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