Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Radio Equipment => Topic started by: pipercub1772 on February 13, 2012, 11:53:27 am

Title: lazer 4
Post by: pipercub1772 on February 13, 2012, 11:53:27 am

Hi , I have a Hitec  Lazer 4 fm   r/c transmiter is it ok to use a Hitec fm dual conversion receiver with it not sure what dual conversion means kind regards Allan

Title: Re: lazer 4
Post by: malcolmfrary on February 13, 2012, 12:05:06 pm

As long as its on the right frequency, the RX doesn't really care what is doing the transmitting.  The "double conversion" refers to the way the receiver does its job - it is a way of tightening up the tuning to make sure that only the wanted signal gets in.  It does need the proper double conversion crystals.

Title: Re: lazer 4
Post by: tr7v8 on February 13, 2012, 12:13:48 pm

Dual conversion sounds like it could be 35Mhz which means it cannot be used in surface craft only aircraft. Dual conversion isn't generally used in boats anyway. 

Title: Re: lazer 4
Post by: pipercub1772 on February 13, 2012, 12:29:08 pm

thanks ,it is 40 meg,i think the transmiter has a has the single conversion crystal  not sure about the receiver but i got the receiver and its crystal new  both crystals say  40.685 having said all that the set up works on the bench i just dont want to interfere with anyone at the lakeside regards Allan

Title: Re: lazer 4
Post by: Martin (Admin) on February 13, 2012, 12:54:29 pm

Quote from: malcolmfrary on February 13, 2012, 12:05:06 pm

As long as its on the right frequency, the RX doesn't really care what is doing the transmitting.  The "double conversion" refers to the way the receiver does its job - it is a way of tightening up the tuning to make sure that only the wanted signal gets in.  

It does need the proper double conversion crystals.

Yes. I had one of these radio too, good set but do a proper range check as my one did have a duff crystal.

Title: Re: lazer 4
Post by: unbuiltnautilus on February 13, 2012, 01:29:39 pm

You can get Dual Conversion Hitec Receivers on 40mhz as well as 35mhz. They are usually  6 channel and higher.

Title: Re: lazer 4
Post by: Subculture on February 13, 2012, 01:58:15 pm

Genuine Hitec dual conversion crystals have a blue label on the tab. Single conversion crystals have a green label.

Title: Re: lazer 4
Post by: barriew on February 13, 2012, 05:16:02 pm

And you only need the Dual Conversion crystal in the RX - there are no dual conversion Tx crystals :-))

Barrie

Title: Re: lazer 4
Post by: Netleyned on February 13, 2012, 05:20:00 pm

No such thing as a dual conversion transmitter.
It's the method used to process the received signal.

Ned

Title: Re: lazer 4
Post by: pipercub1772 on February 13, 2012, 07:05:26 pm

Thanks for the help guys, yes its got the blue  40/meg crystal so i am happy to proceed,just did not want to upset anyone at the waterside once again thanks for you're replyies kind regards Allan