Tx...Rx...Crystal???
 

I am...uh.....RE-building an old trainer I bought used with no electronics.

I have an Airtronics Tx. I want to use a cheaper HiTec Rx. Do I need to buy the Airtronics crystal or the HiTec crystal?

I know (I think), that I need a positive shift, dual conversion Rx from HiTec, but should the crystal match the Tx or the Rx?

(I just asked the same question twice).

OR....should I just spend the extra money for the Airtronics Rx? (I eventually want to switch to a different Tx Mfg like JR or HiTec.....Futaba?)

I am radio illiterate, and I'll bet this has been asked before...I am search illiterate too.

Thanks!



(I am illiterate in at least 4 languages, including English).

DYSLEXICS UNTIE!!!

RE: Tx...Rx...Crystal???
 

You need to buy a receiver crystal that is made for the receiver. The frequency number should match the frequency of the transmitter. Since you said the plane came without electronics, I guess you will also need servos, switch harness, receiver battery, etc. By the time you add up the price of these things, you will find that you will spend as much, or possibly more, than a new 4 channel system. So, since you said you might eventually switch to another brand, I suggest that you give serious thought to making the switch now.

RE: Tx...Rx...Crystal???
 

Listen to Piper on this one. I just received my latest radio system today from Tower. It's a Futaba 9C Super with an FP-R138DP 8 channel receiver, 2 S3151 DIGITAL Servos, 600 mah 4.8 volt battery pack and charger. Total cost was 379.99. Just to buy the radio(TX, RX, Battery pack and charger) alone is $400(don't ask me why[sm=confused.gif]). I threw in a couple of servo mounts and a 1500mah 4.8 volt battery pack and still came in under $400(after an advertised discount through the Tower website:D). The S3151 Servos alone cost $35 EACH, so to buy the same system would have cost me $470[X(] To take it one step further, the receiver by itself costs $100 to buy separately. At this point, for 2 servos and a receiver, I'm already up to $170, and I still have the transmitter, battery pack and charger to go. Save yourself some cash and the hassle and get a Futaba 4 channel system. It's only $120 plus shipping, including four S3004 servos

RE: Tx...Rx...Crystal???
 

If you decide to try and get all the things you need to up date the tx etc. that you have, do us a favor and keep track of how much MORE it cost then getting a new system complete with NO muss or fuss. Get the new system !!! ENJOY !!!

RE: Tx...Rx...Crystal???
 

I agree that buying a package is a good plane.

But, assuming you already have the TX...

As mentioned above, use a Hitec crystal in the Hitec RX.

For the RX, if you want to switch brands in future, get one of the models that is "shift selectable". Some Hitec (and other brand) RX's have a switch or jumper, or automatically detect the shift of the transmitter. So you could use it with any FM TX on your channel.

RE: Tx...Rx...Crystal???
 

Thanks guys,

I should have been more clear. I have servos and battery installed. I was looking at a new Rx from HiTec which allows you to change from positive shift to negative shift any time you want to. I cannot....uh well...wifey would likely be displeased if I did... afford a new Tx before I solo. (Which looks fairly close, at least in geological time).

I see no harm in having two Tx's, do you guys? I was thinking that I could keep the Tx and receivers I have in my trainers for when I want to fly them. I have a buddy-box for that Tx and I could use it to help others when I reach that level someday.

The reason I am interested in the select-shift Rx is because I can use it no matter what radio I decide to get in the somewhat near future. I still have not decided which brand I want after I can fly on my own.

Whichever one I do decide to get, I will get the entire package, not just the Tx. I think all of the mfgs offer a real break on the package as opposed to buying the items seperately.


My current Tx is Airtronics, it has 4 model memory all will be filled once I finish this trainer. 3 trainers and one for my simulator. (I assumed I would crash one, so I got 2....THEN a kid at my field needed money to buy a second plane and offered his trainer for $60 so I bought it, ...he's a nice kid).

So now it begins...JR, Futaba, HiTec? I have no clue. I like the frequency module on the HiTec, I like the 30 model memory and the mixing abilities of the JR XP9303, and Futaba has some really nice radios in my price range too. (5 to 7 hundred).

Ah well, I'll start a new thread about this later on, when I am closer to making a decision.

Thanks for all of your help guys!!

RE: Tx...Rx...Crystal???
 

No harm in having multiple TX's.

But, you mention using them in a buddy box configuration. You need to know that there are compatibility issues between differnet brands of TX when it comes to the buddy box hookup.

RE: Tx...Rx...Crystal???
 

Also, keeping a trainer or 2 as backup in case of an "incident" is a good idea. I keep a couple of "HOT" spares, 3 actually but 3 planes are on the same TX. The 4th is on an older AM set that I buddy up and loan out on occasion. Still have a memory slot open for the plane on the build board now. As Dirty Harry said " A man's gotta know his limitations", and then buy more radios.
Yep, Yep, Yep. :) Looking at a 7C or 9C for down the road.