Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Radio Equipment => Topic started by: Terry on April 23, 2014, 08:09:14 am

Title: Conversion to 40 Mhz
Post by: Terry on April 23, 2014, 08:09:14 am

Is it possible to convert 35Mhz to 40, and are there kits of parts available ?


Cheers, Terry

Title: Re: Conversion to 40 Mhz
Post by: inertia on April 23, 2014, 08:11:19 am

In a word, no.
DM

Title: Re: Conversion to 40 Mhz
Post by: chipmonk on April 23, 2014, 12:55:41 pm

You can, depending on the radio convert to 2.4G but I'm afraid to 40Meg is a no no. Sorry. Well not unless you have a degree in electronic engineering and an awful lot of experience in RF circuitry design. {:-{
Cheers Chris M

Title: Re: Conversion to 40 Mhz
Post by: Subculture on April 23, 2014, 02:47:28 pm

Don't think a degree is necessary, but you would require a good understanding of tuned circuitry, and preferably a set of schematics, which for many sets are not at all easy to find.

Generally it involves changing one or two cheap components and a bit of adjustment. But as they say the devil is in the detail.

Definitely something you should not mess with unless you know what you are doing, as a poor conversion could cause interference and range loss.

Title: Re: Conversion to 40 Mhz
Post by: colin-d on April 23, 2014, 04:30:05 pm

i would say .... yes... but... it depends on what transmitter you have... or thinking of getting..
some of the old Graupner and Futabe work on a HF modul system that were interchangable...
and there is still a few of these sets and moduls about...
for example grauper 4014 or Grauper 6014
 
(http://http://www.rctech.net/forum/attachments/r-c-items-sale-trade/227444d1178177296-ko-mars-mars-r-40mhz-module-rf103f-receiver-kr-301f-crystal-set-rare-100_1235.jpg)

Title: Re: Conversion to 40 Mhz
Post by: malcolmfrary on April 23, 2014, 04:40:17 pm

Of course, if the original set is modular, it might be possible to source an RF module, thus avoiding the legal certification problems.  Practically, the likely source would be a 40MHz set of the same type, but if it was an undamaged donor, it would surely be easier to just use that.

Title: Re: Conversion to 40 Mhz
Post by: Allnightin on April 23, 2014, 04:55:12 pm

From memory, I think Micron ( http://www.micronradiocontrol.co.uk/ ) used to do a module that would do this but that would have been 10 - 15 years ago at least and I can't see anything on their website now.

With the low cost of 2.4 Ghz sets these days,  I would suspect that you would get better value for money with a new Tx and Rx rather than trying to convert to 40 MHz just as support for the older frequency is starting to fall off.

Title: Re: Conversion to 40 Mhz
Post by: Terry on April 24, 2014, 10:04:15 am

Hi, thinking of building a submarine, so must be 40MHz. I have a very nice JR computer radio left over from my Helicopter days, 35MHz of course, and would convert that, but it doesn't seem likely now. Perhaps one of the submariners could start a Topic related to 40MHz gear. Items to sell or swap, unwanted crystals available etc.


Cheers, Terry

Title: Re: Conversion to 40 Mhz
Post by: colin-d on April 25, 2014, 06:08:56 am

most of the computer controlled JR radio's have the module system... so i would still be on a yes for a convertion...
 
which transmitter do you have...?? MC15, MC16, MC20.... ??
 
(http://www.rockcrawler.de/index.php?page=Attachment&attachmentID=145665)

Title: Re: Conversion to 40 Mhz
Post by: Terry on April 25, 2014, 09:00:59 am

Hi Colin, it's a XP 652.


Cheers, Terry.

Title: Re: Conversion to 40 Mhz
Post by: colin-d on April 25, 2014, 09:33:50 am

now knowing what sort of Transmitter it is... and doing a little research... my "Yes" would have to be changed to a "No"...
as the Transmitter is not of the Modular type...
 

Title: Re: Conversion to 40 Mhz
Post by: Terry on April 25, 2014, 11:43:29 am

Colin, thanks very much for taking the time to research my Radio gear.


Cheers, Terry