Orignal, Magnum500</p>
i`d say about 50% of the receivers i`ve purchased thus far have been faulty they will not lock on
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I have one of the 9303 on 2.4 and have used JR since the late 70's with NO problems when using JR Recivers. You don't say wether they are JR or some other brand, I have had a lot of problems with NON JR recivers with JR transmitters. You may have a problem with the Transmitter or you may not be setting them up correctly.</p>
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Cheers</p>