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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> *Good Radio For Gasser*
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*Good Radio For Gasser* - 7/8/2006 1:31:05 PM   
Zippi



Posts: 3308
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		I have alway flown Airtronics and since I've gotten into gas I need to have a PCM radio which Airtronics doen't offer unless you buy the PCM receiver seperate. Some of the guys at the local field have the Spektrum's 2.4GHz DX6 parkflyer radio and said that they shouldn't cause any RF interference. I saw that JR is coming out in August with the JR XP7202 Synthesized PCM Radio for about $325.00 and I wanted to know if anyone could tell me if these new Synthesized systems would be good for gassers? If not, I'm looking to spend around $300.00 - $350.00 for a new radio that is compatible with all Hitec radio gear. I'm not a radio person I just fly and have been for over 14 years. Any suggestions on a radio???

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RE: *Good Radio For Gasser* - 7/8/2006 2:19:54 PM   
captinjohn


 

Posts: 6483
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: offline 		Zippi: Until you get a new radio...why don,t you try a glow plug adapter and a good 4 cycle Glow plug. Mix the fuel like Av8tor says. No ignition interfence then. You just may like how much better the engine runs also. Capt,n

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RE: *Good Radio For Gasser* - 7/8/2006 2:24:29 PM   
captinjohn


 

Posts: 6483
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: offline 		Fogot to say...Multiplex Radios seems very good. I know a guy that flys all types of planes with lots of electrical goodies on-board. He has had no problems. The prices are getting better on them too. Cap,n

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RE: *Good Radio For Gasser* - 7/8/2006 2:41:18 PM   
Zippi



Posts: 3308
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		JR is coming out with the new 7202 in August for $329.00. May have to get one.

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RE: *Good Radio For Gasser* - 7/8/2006 3:00:30 PM   
Antique



Posts: 682
Joined: 7/14/2002
From: Anywhere, CA, USA
Status: offline 		Zippi, Why do you feel that you need a new radio ? PPM radios work very well in gasers if you set the plane up correctly, no need or requirement for PCM.

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RE: *Good Radio For Gasser* - 7/8/2006 3:47:41 PM   
exeter_acres



Posts: 6251
Joined: 9/22/2004
From: Johns Creek, GA, USA
Status: offline
quote:

ORIGINAL: Antique

Zippi, Why do you feel that you need a new radio ? PPM radios work very well in gasers if you set the plane up correctly, no need or requirement for PCM.




Exactly... you DO NOT need a PCM just because it is gas... set it up correctly and it will work fine....
this is true for both PPM and PCM....

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RE: *Good Radio For Gasser* - 7/8/2006 5:02:02 PM   
Zippi



Posts: 3308
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		Ok guys. I did a lot of research before I got my first gasser and I've got everything as it should be but I'm still getting glitches every time I take it up. I have the radio gear and battery pack seperated from the EI and battery pack, I have a Gold-N-Rod on the throttle, The antenna goes out the bottom of the fuse alone the bottom of the fuse to the rear and its away from the EI. Have you got some other things I can look far???

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RE: *Good Radio For Gasser* - 7/8/2006 6:04:41 PM   
exeter_acres



Posts: 6251
Joined: 9/22/2004
From: Johns Creek, GA, USA
Status: offline 		a pcm does not make glitches go away.... it only covers them up....

many many people set up their big planes with a PPM Rx and once all glitching is taken care of, switch to PCM (but it isn't needed)




which engine and which airframe?

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RE: *Good Radio For Gasser* - 7/8/2006 6:25:42 PM   
Zippi



Posts: 3308
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		exeter_acres,

I'm running the Brillelli 26cc SS on the GSP Giles 202. I checked and there is a little slop where the metal clevis goes through the nylon control horn on the elevator but that shouldn't cause a problem I wouldn't think. I have no metal to metal contact.


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RE: *Good Radio For Gasser* - 7/8/2006 11:42:32 PM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline
quote:


I'm looking to spend around $300.00 - $350.00 for a new radio that is compatible with all Hitec radio gear.

JR is coming out with the new 7202 in August for $329.00. May have to get one.


Standard Hitec gear requires a TX that is Negative shift modulation. JR is not compatible with same as their equipment is positive shift. Futaba is negative shift while Hitec, MPX and Airtronics offer positive and negative shift selectable TX's. As far as I can recall Hitec is the only OEM offering negative, positive and shift selectable RX's for use with all brands of radio equipment. PCM RX's are proprietary with the OEM manufacturer (no mix and matching is permissible)...

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RE: *Good Radio For Gasser* - 7/8/2006 11:50:47 PM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Problems with gasser's are often found with the ignition system. Make sure you have an !QUOT!R!QUOT! type spark-plug and your spark-plug boot/cable is completely seated on the spark-plug. Ensure you have only ONE ground path from the ignition box to the engine (typically via the plug wire/cable). Multiple ground paths are undesirable.

Are you able to ascertain if the interference is only realized with the engine running while performing a thorough ground range check engine running at 50% throttle or so as compared to the engine not running?

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RE: *Good Radio For Gasser* - 7/9/2006 12:20:00 AM   
Zippi



Posts: 3308
Joined: 6/29/2004
From: Evansville, IN, USA
Status: offline 		mglavin,

I do have a resister type plug and only one ground coming from the plug wire and it fits tight on the plug. I did a range check at the field and everything was ok. I did not try a range check with it at half throttle. Everything seems ok on the ground, its once I get in the air. I get little glitches on each end of the field, never seems to be within the length of the runway. Running the engine at half throttle and doing a range check, what will that tell me since everything about checks out? The Hitec receiver is a Supreme Shift Selectable so so I think it will work with JR. all I really care about is if the Hitec servos will plug into the JR receiver.


< Message edited by Zippi -- 7/9/2006 12:27:58 AM >

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RE: *Good Radio For Gasser* - 7/9/2006 2:29:29 AM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Running the engine will cause and affect any suspect harmonic vibration to be realized. Metal to metal abrasion is often the source of these problems. Look closely at your tailwheel too, I'm aware of several instances where this was the culprit.

Shift selectable RX's will work without issue with JR equipment. Hitec and JR both use the "S" type plugs worry not.... Hitec equipment released of late, even the Futaba style stuff will correctly accept the "S" style connectors used by Airtronics, JR, Hitec, MPX and others.

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RE: *Good Radio For Gasser* - 7/10/2006 7:04:32 AM   
Javier Garcia


 

Posts: 44
Joined: 3/8/2004
From: BadajozBadajoz, SPAIN
Status: offline 		IPD Multiplex are a good option too. They have the PCM abillities and the PPM advantages. When you feel there is an interference, you can also turn off the IPD filter, to check if there is, really, an interfference.

PCM only will mask the problem, not solve it, and, as the interference increase, PCM will only set the servos where you wish (and you crash, off course).

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RE: *Good Radio For Gasser* - 7/10/2006 8:31:51 AM   
Ed Cregger N2ECW


 

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Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		Zippi, if you haven't done so as yet, it might be a good idea to test fly this receiver in a glow powered model, just to see if the problem is ignition induced.

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RE: *Good Radio For Gasser*