Transmitters for both air and surface?

[Charles P Lamb]

Are there any transmitters available which may be readily switched for use
between the USA air and surface R/C bands?

Charles P. Lamb

[funfly3]

Charles P Lamb wrote:
> Are there any transmitters available which may be readily switched for use
> between the USA air and surface R/C bands?
>
> Charles P. Lamb
>
>
You can get sets with a plug in RF modules
<http://www2.towerhobbies.com/cgi-bin/WTI0097p.pgm?CATEGORY=LE>
as far as I know no receivers are multi-purpose, I use a Futaba set in
the UK and just swap the module in the transmitter
Kevin

[fatboy999]

Charles, all you need to do is get different crystals (in matched pairs) for the transmitter and receiver for either surface or air frequencies. Check with your local hobby shop and they can advise you on the correct crystals. Most surface radios are basically designed with air controls and labels, but have only changed the crystals for the surface frequencies. There is different blocks of frequencies for surface and air usage.

[John Mianowski]

Charles P Lamb wrote:
> Are there any transmitters available which may be readily switched for use
> between the USA air and surface R/C bands?
>
> Charles P. Lamb

Not switched, but 27MHz band can be used for either/both.

JM

[Mike]

This is in reply to message of Thu, 14 Sep 2006 08:43:56 -0500, fatboy999
<fatboy999.2e4r8b@rcgroups.com> which said:

>
>Charles, all you need to do is get different crystals (in matched pairs)
>for the transmitter and receiver for either surface or air frequencies.
>Check with your local hobby shop and they can advise you on the correct
>crystals. Most surface radios are basically designed with air controls
>and labels, but have only changed the crystals for the surface
>frequencies. There is different blocks of frequencies for surface and
>air usage.
I doubt that is true if he wants to use 72 MHz for aircraft and 75 MHz for
his surface vehicles - much the same as here in UK, you certainly can't
just change crystals to swap from 35MHz to 40MHz. Think about the tuning
bandwidth that would be needed for the receiver front-end - it would
susceptible to all manner of interference if designed like that.

[John Mianowski]

fatboy999 wrote:
> Charles, all you need to do is get different crystals (in matched pairs)
> for the transmitter and receiver for either surface or air frequencies.
> Check with your local hobby shop and they can advise you on the correct
> crystals. Most surface radios are basically designed with air controls
> and labels, but have only changed the crystals for the surface
> frequencies. There is different blocks of frequencies for surface and
> air usage.
>
>
> --
> fatboy999
> ------------------------------------------------------------------------
> fatboy999's Profile: http://www.rcgroups.com/forums/member.php?u=56732
> View this thread: http://www.rcgroups.com/forums/showthread.php?t=569180

I have never heard of that working & plenty of recommendations that it
won't work. I've also seen recommendations not to change crystals more
than a channel or 2 either way, much less between bands. I'd really
like to see a cite from somebody who's actually done it & had it work,
but I seriously doubt that there are any.

JM

[Jim Slaughter]

Using 27MHz for air is generally tolerated (although not exactly legal)
because you won't be interfering with anyone else at the flyer field who all
are on 72MHz. 27MHz is approved for surface too I believe. I know it is for
boats.

You can not switch "bands" unless your transmitter has a 'module'. You will
then need separate receivers on the separate bands. For example, if your
transmitter uses a module, you put in the module for 72MHz for air or a
module for 75MHz for surface.

"Charles P Lamb" <clamb@acm.org> wrote in message
news:psSdnUqje4oe5prYnZ2dnUVZ_s6dnZ2d@comcast.com. ..
> Are there any transmitters available which may be readily switched for use
> between the USA air and surface R/C bands?
>
> Charles P. Lamb
>

[kenw]

You can use a Futaba 2.4ghz.Fasst system for surface and air.:)


--
kenw
------------------------------------------------------------------------
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View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=24

[Jim]

Any 2.4Ghz radio can be used for surface or air. No problem. Personally, I
prefer Airtonics 2.4.


"kenw" <kenw.3jrqma@no-mx.forums.yourdomain.com.au> wrote in message
news:kenw.3jrqma@no-mx.forums.yourdomain.com.au...
>
> You can use a Futaba 2.4ghz.Fasst system for surface and air.:)
>
>
> --
> kenw
> ------------------------------------------------------------------------
> kenw's Profile: http://www.modelpowerboat.com/forum/member.php?userid=5299
> View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=24
>