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FAQ
Why does JR not offer channels 11 to 14?
Close to over 98% of the receivers sold by JR are single conversion. As you probably know, JR engineers figured out how to make a single conversion receiver work, where our competitors went principally with dual conversion. The performance and reliability of JR single conversion receivers in the U.S. market is legendary - we have nearly 85% market share in the jet market, where the models are the most costly in the world.
One aspect of single conversion that's irrefutable is that the local oscillator is located 455Kh from the controlling channel. Consequently, channels 57 thru 60 could cause interference to channels 11-14. To eliminate this possibility, JR doesn't offer channels 11-14, thus preventing the possibility of interference caused from inter-band image issues. After all, there are still plenty of frequencies to choose from.
What is the proper technique for Range testing?
See this article
What's the maximum and minimum operating temperature of my JR equipment?
0 Degrees Celsius or 32 Degrees Farenheit Minimum
50 Degrees Celsius or 122 Degrees Farenheit Maximum
What is the difference between positive and negative shift?
Shift is a term used in the radio world to refer to the type of Frequency Modulation applied to a radio signal. Most R/C equipment is either positive or negative "shift". JR Radios use a positive shift modulation on the radio transmission. This means that when you are transmitting on a frequency of 72.510 the receiver will be looking for a carrier "shift" in frequency that is a positive +5 kHz or 72.515 to let the receiver know that the radio carrier wave is sending information. Negative shift transmitters are looking for a carrier "shift" that is a negative -5 kHz or 72.505 to let the receiver know that it is sending information. That is why a negative shift receiver will not work with a positive shift transmitter - it is looking for the carrier frequency shift in the wrong area, and information that it needs to work properly.
What is the warranty period for JR products?
Up to 3 years. Click here for complete warranty policy information.
Can I get a cost estimate on repairs?
Estimates cannot be given until an assement has been performed by a JR service technician. When sending in a repair, please request in writing if an estimate is needed prior to the repair.
Are warranties transferrable?
No, warranties are valid for the original purchaser only.
Can you service a radio bought internationally?
We can only service product purchased through North American, South American, and Carribean dealers.
What does 'JR' stand for?
Japan Remote Control
Do you have a repair facility in Canada?
No, the only authorized service center is in Champaign, IL.
How fast is turnaround time for repairs?
Our goal is to maintain a 5-day or less turnaround time.
Can I trade in my old radio for a new radio?
No, we do not currently offer a trade-in service for any equipment.
Can I change the crystal on my transmitter or module?
No, it must be returned to the authorized JR Service Center per FCC regulations.
What is the difference between SPCM and ZPCM?
PCM stands for Pulse Code Modulation. ZPCM has a lower resolution than SPCM. Resolution refers to how many steps a servo takes in its rotation. ZPCM uses 512 and SPCM uses 1024, resolutions which results in greater servo accuracy.
What do the dots on the crystals mean? Are they important?
The dot indicates the cut of the crystal in relation to its true frequency, either centered exactly on the frequency or just above or below the frequency when viewed on a scope. With today's level of tuning, it makes very little difference in overall performance. For top performance, in those models that require the absolute best, such as turbines and giant scale aircraft, avoid using oposite dots in the transmitter and receiver, such as a left dot in the transmitter and a right dot in the receiver. For the best performance they should be next to each other, a center and a right or left, or the same. The dot system is a way that JR users can fine tune their set up for optimum performance.
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