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Old 06-21-2003, 07:34 AM   #1
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Default Futaba 3pk HRS receiver and non digital servos

Is there asolution to use standard servos with the HRS reveiver?
I suppouse that you can use HRS with standard servos.



Thanx a lot!!!
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Old 06-21-2003, 10:25 AM   #2
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The manual specifically says not to use a non-digital servo with the HRS RX.....you can take the risk of frying both your reciever and servo.....
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Old 06-21-2003, 12:34 PM   #3
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Never use standard servo with HRS. You can tried it. Let us know how things happen.

Quote:
Is there asolution to use standard servos with the HRS reveiver?
I suppouse that you can use HRS with standard servos.
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Old 06-21-2003, 08:04 PM   #4
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I tried it, figured it was worth a shot. Basically it was like a glitch machine, imagine the worst glitching you've ever had, x 10.
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Old 06-22-2003, 12:55 PM   #5
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I tried it with a crappy old 3003 servo a few weeks ago just to see what would happen. The servo wasn't responsive at all and it's movements were very erratic, you could also hear it making a ton of noise like the internals were all going in different directions. It also glitched like all hell broke loose, when I shut it off and turned it on again, the servo didn't work anymore. By Futaba saying not to use analog servos in HRS mode, they're not joking around, IF YOU USE AN ANALOG SERVO IN HRS MODE YOU WILL FRY IT, plain and simple, there is no way around it.
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Old 06-22-2003, 06:39 PM   #6
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The sampling rate of analog servos is too slow for the HRS. Analog servos sample at a rate of 30 pulses per second whereas digital servos sampling rate is close to 300 pulses per second.
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Old 06-22-2003, 10:25 PM   #7
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I didn't fry the servos, they just didn't work with HRS mode, they work fine with a regular radio still though.
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Old 06-23-2003, 02:37 AM   #8
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Would other rx (ppm/fm123 for eg.) work fine with 3PK besides the HRS and the PCM?
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Old 06-23-2003, 06:40 AM   #9
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Quote:
Originally posted by GTO2
Would other rx (ppm/fm123 for eg.) work fine with 3PK besides the HRS and the PCM?
Yes. Be sure to use the correct crystal for the Rx and that it matches the Tx crystal.
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Old 06-23-2003, 06:44 AM   #10
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Quote:
Originally posted by GTO2
Would other rx (ppm/fm123 for eg.) work fine with 3PK besides the HRS and the PCM?
I have used KO and Sanwa (Airtronics) FM RX with my 3PK with no problems. @40mhz I even use KO crystals (matched sets)...again no problems.
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Old 06-23-2003, 07:09 AM   #11
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im using the hrs receiver that came with the 3PK as well as the ff. receivers with no problems (40mhz):

1024PCM, R123F (FM), R114F (FM) Note: the R114F is a 4-channel microservo (about 1/2 the size of the R123F) that was intended for airplane use, i think, bec. of the very long antenna wire
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Old 06-25-2003, 12:49 PM   #12
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Thanks for the reps.
One more question: Would Tx have a same power over any freq on its band? Say I got it of factory at Ch63 (40MHz) would it have certain loss/damaging effect if I operate it at Ch80 (abt 500kHz difference)? TIA.
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Old 06-25-2003, 08:53 PM   #13
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No loss what so ever. The KO RX do not come with any crystals when new. I think Futaba simply stick a crystal in their RX to fill in the hole .....I've never managed to find a band that I am using.....
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