Here is a state side supplier of 27 Mhz FM crystals that work with Heng long tanks. I have tested these and they work fine, You need the 27 Mhz FM F type crystals, and he has 12 different channels available. (Look for the Japan Futaba crystal set on the web page) Some of these of course duplicate the HL crystals. Also order them by the frequency not the channel number, A channel 1 in HL might be a channel 6 in these, so just because you have channels 1-4 in a Heng Long crystals doesn't mean you just order 5-12 in these.

I think he is selling these for about $7.50 a channel


[link=http://www.performancedevices.com/27_and_29mhz_am_and_fm_sets]Sport crystals[/link]

Cool...thanks. Always good to have some options.

Just to add the reference in the thread, here's HL's frequency break down:

1) 27.145
2) 27.195
3) 27.095
4) 27.550

The reference: http://www.rcgroups.com/forums/showthread.php?t=819036 (Thanks, blitz)

Other options: http://www.rcuniverse.com/forum/m_7435355/tm.htm

I guess the price is only $6.95 for a set.

27.550 was reserved for Federal use last time I checked the FCC website. There are only 6 channels legally available for use in the 27MHz band for RC in the US (and I believe Canada adapted those regs as well)</p>

Vendors may sell those crystals, but they aren't legally responsible if you use them - the FCC do not allow you to replace the Tx Crystal as far as I understand their regs - you must have all transmitter modifications carried out by a FCC licenced radio tech.</p>

Something to keep in mind before you get caught jamming up CB radio channels, and get fined $$$$$....</p>

Given the output power on these TX's versus the power on a CB (most of which are vehicle mounted), I'm not worried about stepping on a CBsignal. Quite the opposite actually.

I hear you Philipat , just passing along what I know...
Mart

yep...good to know, though...means I should stay away from roads and such if I want to use all 12 crystals. That keeps me from stepping on them and them on me!

HL now have ten sets of crystals -</p><font size="2">

01 – 27.145
02 – 27.195
03 – 27.095
04 – 27.550
05 – 27.245
06 – 27.295
07 – 27.345
08 – 27.600
09 – 27.650
10 – 27.680</p></font>

Heng long

01 – 27.145
02 – 27.195
03 – 27.095
04 – 27.550
05 – 27.245
06 – 27.295
07 – 27.345
08 – 27.600
09 – 27.650
10 – 27.680

Sport Crystals

PDV930-0975 Chan 01 26.975MHz
PDV930-0995 Chan 02 26.995MHz
PDV930-0025 Chan 03 27.025MHz
PDV930-0045 Chan 04 27.045MHz
PDV930-0075 Chan 05 27.075MHz
PDV930-0125 Chan 07 27.125MHz
PDV930-0175 Chan 09 27.175MHz
PDV930-0225 Chan 11 27.225MHz
PDV930-0255 Chan 12 27.255MHz


20 channels. Only 19, found one other channel that was a duplicate between the two lists

20 Channels ???????</p>

That sounds about right.</p>

Three Axis tanks vs Seventeen Allied tanks.</p>

SWEET!!

If you go to Radio Shack, you can get a 6 pack of tx/rx for x-mods. Cost is $16 or so and contain 6 of the freq's shown above in the Sport Crystals list.

Do you have a part number Nomobux? I searched the site but came up empty.

Only number is the barcode 40293 00348. Front only says Racing Crystal Set. Here's a couple of bad pics. I think that 10A03 on the back side may be a QC tag ??

Used 600-8507 as it looks like Radio Shack number and gave me the owner's manual on Radio Shack's website. The part number is 60-8507, thanks!

I'd be cautious with these. I tried some 27 Mhz FM crystals for Xmods and none of them worked. It matters what type of crystal you have I found out. F type is what you want. The same frequency in an S type crystal will not work.

You mean FM and AM, Dan? Never heard of F and S types.

No in FM crystals there are S and F type crystals. My first order with Sport crystals I received the same FM frequencies in an "S" type crystal and they did not work. I had to send them back and get them replaced with the "F" type. I guess the crystals can have a different impedence, and this counts. As I mentioned I bought these Xmod crystals and none of them worked, much like the "S" crystals made by Sport crystal did not work.

You must get the "F" type. F stands for Futaba I think.

Well guys, my curiosity was peaked. Went out and tried them ... NO GO. I had gotten these originally for a car. I am not up on electronics at all. I thot freq was freq. Sorry fellas.I shall now go out and bore site my main gun on my forehead !!!

Learned something new today, had no idea! Guess I got lucky when I bought the Red Hawks and tested them out. Thanks for trying Nomobux, you've saved others from making this error and that's what the forums are about, sharing information.

Ya, join the club, been there, done that.

That is the beauty of these forums. Learn and share to either help some, or prevent others from making the same mistakes. For the record I have tried the Sport Crystal 27 Mhz FM, "F" type crystals and they all work.

FYI: Futaba channels 7 and 9 work fine. I bought both and tested, work great!

That's great to know . I got 14 Tanks and I am sick of being limited to just 4 freqs. I want to operate all of them on a different freq. [8D]