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36MHZ Crystal useability in RX from USA?

Old 03-13-2004, 06:18 AM
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xphasor
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Default 36MHZ Crystal useability in RX from USA?

I am trying to order a GWS flight pack including receiver eg:
http://ehobbies.com/rc-gws-2010.html
but we fly on 36MHS here in Australia.
Can I buy a GWS 36MHS RX crystal on my frequency here and use it with a RX from the USA that would normally be used with a 72MHS crystal? I just don't know if the different band receivers are actually any different!
Thanks in advance!
Old 03-13-2004, 10:19 AM
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AMA-69405
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Default RE: 36MHZ Crystal useability in RX from USA?

xphasor,

Absotively, posilutely... NO. You can't expect a receiver that is tuned to 72 MHz to successfully receive and interpret a transmitted signal on 36 MHz, no matter what crystal you put in it.

Gary L.
Old 03-13-2004, 07:23 PM
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Default RE: 36MHZ Crystal useability in RX from USA?

He is absolutely right, but if you buy a UK specification 35 Mhz Rx, it will work fine with a 36 Mhz xtal.

Ive done it when I moved from the UK to Oz.
Old 03-23-2004, 01:41 AM
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antonl
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Default RE: 36MHZ Crystal useability in RX from USA?

David,

Did your receiver require any retuning in changing from 35 to 36? Also, did you have to use a channel from the lower end of the 36 spectrum?

The reason I ask is that I am looking to purchase a couple of 35Mhz receivers (+ servos) from Asia (probably Singapore or HK) and thereby save a substantial amount on the (exorbitant) prices here in Australia.

Thanks,
Anton
Old 03-23-2004, 02:46 AM
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Default RE: 36MHZ Crystal useability in RX from USA?

I bought a radio while on holidays in the UK in 1997. It was a 35Mhz set. While it worked with my 36 Mhz crystals in the Tx and Rx, it was short on range.

Tuning by a MAAA authorised testing station brought range up to spec. I always get a radio checked anyway unless it comes with a MAAA certificate - which is not the norm, so it was no extra cost to me.

fiery
Old 03-23-2004, 06:12 AM
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antonl
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Default RE: 36MHZ Crystal useability in RX from USA?

Fiery,

Just wondering - in order to get the full range did you need to get both the Rx and Tx tuned or only the Tx?

The reason I ask is that (at this stage) I only wish to purchase Rxs.

Also, may I ask roughly how much it cost?

Thanks,
Anton
Old 03-23-2004, 03:46 PM
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Default RE: 36MHZ Crystal useability in RX from USA?

If you're using an existing 36Mhz transmitter then it won't need to be retuned -- only the new (35MHz) receiver.

It's a pretty simple job so I'd be surprised if you were chargd more than the service agent's minimum fee ($30-$40 in many cases).
Old 03-24-2004, 05:30 AM
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ozextra62
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Default RE: 36MHZ Crystal useability in RX from USA?

By the time you bring the rx into the country, pay to have it retuned, is it really worth the few dollars you may save?
Remember the 36MHZ gear used here is unique plus the market here is small in proportion to the rest of the world, R/C manufacturers have to have specific productions runs to cater for our small market.
Old 03-24-2004, 07:15 AM
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DavidO
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Default RE: 36MHZ Crystal useability in RX from USA?

Xphasor - Contact the GWS website with your question.

Their website shows JR crystals to be a direct replacement for GWS crystals on certain receivers and frequencies.

http://www.gws.com.tw/english/produc...on%20chart.htm

If only other manufacturers would give such detailed info'.

Changing component values for different frequencies in todays receiver manufacture is just a matter of pressing a couple of buttons on the assembly machine.
Similar concept applies when you take your photographic film to a high street shop and the prints are ready in 30mins - in different sizes if you want. It's just a transfer of production technology ideas.
Old 03-26-2004, 07:20 AM
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xphasor
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Default RE: 36MHZ Crystal useability in RX from USA?

Awww nice one DavidO!
Now I'm embarrassed since I usually spend half my time on that site checking the specs of things that online retailers are selling (don't you love how they expect you to buy a battery pack without them even advertising the weight? In an aero application that is like asking for your credit card number without quoting a price!!)
Now I just have to deal with the fact that the bloody JR crystals are $30 AUD! Eh, maybe I should concentrate more on making money, and less on research, and then I wouldn't have to sweat it.
Old 03-31-2004, 12:26 PM
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Default RE: 36MHZ Crystal useability in RX from USA?

I want to buy a JR 9X from england but they use 35Mhz,
I was told that the JR 9X is illegal to use in the States it HAS to be FCC approved in this
country. using it invalidates all coverages by AMA including the clubs and
field owner. Is this true?? cant you covert it somehow.
Old 03-31-2004, 03:38 PM
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Jim Schwagle
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Default RE: 36MHZ Crystal useability in RX from USA?

You could check with the manufacturer or someone like Radio South, but I think a change across that great a frequency would probably be more expensive than simply buying it locally.
Old 03-31-2004, 04:41 PM
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Default RE: 36MHZ Crystal useability in RX from USA?

Re: importing JR 9X for US use

You could buy one from the UK or Oz and use it, but:

1. It will come factory Mode 1 set up. Most US flyers fly mode 2

2. You can swap the 35 / 36 Mhz Module for a 72 Mhz module

3. The Tx "wall wart" charger will be useless as household electricty is 240~250 volts (US 110 volts) with a different plug pin configuration

4. The Rx will be useless to you - wrong frequency

5. Horizon won't want to know you if you have a "warranty" issue with the set

6. Customs duty?

7. Radio's in the UK and Oz cost lots more than they do in the US so there is no benefit there!

Cheers

fiery
Old 03-30-2005, 04:05 PM
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lozza6
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Default RE: 36MHZ Crystal useability in RX from USA?

Thats awesome news!

i was after the XRB lama..... but it doesnt come in 36Mhz version....

i'm in australia with 36Mhz Tx... so you reckon i can just buy a 36.330 Crystal for the XRB Lama and it will work with my 36.330 JR 9X Transmitter?

Man if thats the case, i'll just buy the 35Mhz XRB Lama WITHOUT transmitter....

so its a gaurentee that it will work? 36Mhz Tx controlling 35Mhz Rx?? FM i believe

cheers guys!!!

this is great news!!!

Loz

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