496xl

Hi All,
Quick question,I have a JR SX600 Tx,buying new Rx and servos,how do I know what system I
have....single or dual conversion,This will tell me what crystals to buy.The specs on this Tx does not
tell me.

Thx for any help.
Perry

w8ye

My Feedback: (16)

The crystal goes in the receiver and that is what matters whether it is single or dual conversion

The RS 600 receiver is single conversion

496xl

thx w8ye,
Thank you for the reply,I will get the single conv.crystal.

again thank you.

Campgems

WAIT A MINUTE. You need to check the receiver you are going to buy to determine single or dual conversion. The transmitter doesn't enter into the equation at all. The single or dual conversion is determined by the receiver, whether it has one or two IF (intermediate frequency) stages. Before buying a Xtal for the receiver, make sure it is compatable with that receiver. Ignore the TX other than the channel and whether it is PPM or PCM. My recomendation is to buy a crystal from the manufacture of your receiver. You may find an aftermarket one for a couple bucks less, but after loosing a plane due to one of these cost recuction decesions, $2 will not replace the loss of plane and equipemnt. Get a Xtal for the receiver you are buying from the same manufacture.

Don

w8ye

My Feedback: (16)

There's not much choice from Horizon any more.

496xl

I thought the JR RS600 Rx was single conversion as stated above?

JohnBuckner

My Feedback: (1)

Yes it is and that is fine, The point is the Tx does not care whether or not you use a single or dual conversion Rx as long as the Rx has the right conversion type crystal for the Rx.

Your Tx will work just dandy with many dual or single conversion Rx's and not neccessarily just JR brand either.

John

Campgems

Guys read this again. As I read it, he has a JR SX600 TX and is going to buy another receiver and servos. There are a lot of choices other than JR I'm guessing, being a Futaba guy. Maybe if he sticks with only JR receivers, the question is mute, but I think my advise that he buys a Xtal from the manufacture of the receiver he is going to buy the receiver from is still sound advise.

Don

JohnBuckner

My Feedback: (1)

Agreed And thats the way I read it as well, there are many options open to him and at better prices now.

w8ye

My Feedback: (16)

Being as you guys are bringing up other brands of receivers, one of you needs to explain to him that his JR transmitter is positive shift and that he must buy a positive shift capable receiver? I know the new Hitec 8 channel can handle either positive or negative shift but many receivers are one or the other.

496xl

I'm new to JR, I heard the safest thing to to do is stick with a matched system,
thats why I was trying to figure out how/what is a matched system for the
Rx.
Thx for all the help,trying to purchase another brand of Rx's and servos to
match my Jr....well It's starting to give me a headache.

rgds,
Perry

496xl

I thought the RS600 Rx is capable of both shifts
or am I wrong?
thx again,
Perry

w8ye

My Feedback: (16)

You are correct. The RS600 is shift selectable but some receivers are not

496xl

Thx, That has cleared the mud a little,nowadays
avionics is soo much different than when I started in this
hobby.

JohnBuckner

My Feedback: (1)

This is a perfect matched system for you JR Tx and it is Dual conversion. Less money AND in my opinion a superior performer to the Jr 600 and has a proven track record of durability, best of all If you have to send it in with crash damage or whatever you will be dealing with the best customer service bar none and I have had experiance with all four of the majors customer service.

Agine there are many options avalible to you.

http://www3.towerhobbies.com/cgi-bin...&I=LXKYK3&P=ML

This is the crystal that you would use in the above Rx (eight bucks) on the frequency of your Tx, Do not use a JR crystal in this Rx.

http://www3.towerhobbies.com/cgi-bin...I=LXN503**&P=V


John

w8ye

My Feedback: (16)

I must have 12-15 of these receivers that John is recommending. I use the Hitecs receivers with a Futaba transmitter. I use both Hitec and Futaba servos with them.

Obviously They are my favorite

opjose

Yup and the Hitecs are more noise immune than the JR's.

496xl

w8ye,
Do you care to sale any of those Rx's?
Also,so if I get a Hitech Rx,I can use my standard
Futuba servos(S148's I believe) with no connector mods?
But the Jr battery connector will opposite correct?
Perry

496xl

Johnb,
Thx for that info,I will be looking into those Rx's and crystal.
Perry

w8ye

My Feedback: (16)

I don't care to sell any of mine. As they give out, I'm not replacing them but going 2.4 ghz

496xl

w8ye...plz see my above questions regarding Rx and servos and battery connections...plz
Perry

w8ye

My Feedback: (16)

Yes, the new Hitec receivers come with the Futaba sockets in the receiver and you can also plug a JR battery into the receiver.

I have this setup myself in one of my planes

496xl

w8ye,
I thought the JR servos and batterys have the reversed polarity hook-ups?
If so,then did yo modify them?
Perry

JohnBuckner

My Feedback: (1)

Hold on now be careful, if you are going to start buying used. Things are not so simple While the exact Hitec I posted a link to is current and the perfect match for your Tx and yes as w8ye has indicated your JR servo plugs fit perfectly.

The problem here Hitec supremes have been manufactured in many forms in the past to include: non shift select negative shift only, non shift select positive shift only, and there was even a version specifically (and only) for the old stype Airtronics and all the power leads were reversed and positivily not work with your servos or switch harness.

As you can see the potential for wasting money buying used is high unless you know exactly what you are buying.

In your case any positive shift Hitec Rx will work and in most cases it will say JR directly on the hitec label if you look closely.

Agine the reason I recomend New folks to never buy used untill they have acquired some knowledge concerning what they are buying.

As for me I never ever purchase a used Rx. Russian Roulette is not my kind of game concerning my airplanes I have to much sweat equity in each and every one of them. This even more so now that Rx's are so cheap with the coming of 2.4. While I too am adding 2.4 units rapidly now I could never use up all my 72 stuff and will also be flying 72 probably untill I am no longer able get to the field.

JohnBuckner

My Feedback: (1)

JR batteries are NOT reversed polarity from all the other They are also centerpin positive just like Hitec, Futaba and Airtronics (not the old style Airtronics).

What you are confused about is the fact that JR chooses to wire the JR wall charger on the TX lead and the JR Tx charge jack with reversed polarity of everyone eles. The Battery agine is not reversed from the industry standard but the charge jack on the JR Tx's is.