<HTML><HEAD></HEAD>
<BODY dir=ltr>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial'; COLOR: #000000">
<DIV>I have some Spektrum RC gear, a DX7 transmitter and several
receivers. It does work rather nicely.</DIV>
<DIV> </DIV>
<DIV>From what I have read, it relies on specific RF chips, made for the 2.4GHz
ISM band. It is also direct sequence spread spectrum, not frequency
hopping. I’m not sure how or what we could use it for. Syncing
direct sequence and frequency hopping can be totally different animals.</DIV>
<DIV> </DIV>
<DIV>There are also several clock oscillators for computer CPUs that use spread
spectrum so they don’t constantly interfere with other devices. The good
news is that they only interfere some of the time – with potentially more
devices.</DIV>
<DIV> </DIV>
<DIV>I think we are/were looking to use FHSS on VHF/UHF frequencies, not at
2.4GHz. That’s too much like broadband, HSMM, or whatever it’s being
called this week. I have a pile of WRT-54Gs that are not doing anything
already, and with folks moving up to 5GHz, it seems like they were yet another
waste of funds.</DIV>
<DIV> </DIV>
<DIV>IIRC, the renewed interest in FHSS was because Andre wanted to do something
with simpler hardware (Arduino Uno & DDS modules), that could be duplicated
by the average ham without difficulty. If pre-built devices CAN be hacked
into a simple ham-related project, that would certainly fulfill his goal.
I don’t think the Spektrum RC stuff and be, but I’m willing to learn
otherwise!!</DIV>
<DIV>73, Terry, WB4JFI</DIV>
<DIV> </DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV style="FONT: 10pt tahoma">
<DIV><FONT face=Arial></FONT> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=markwhi@gmail.com
href="mailto:markwhi@gmail.com">Mark Whittington</A> </DIV>
<DIV><B>Sent:</B> Tuesday, January 20, 2015 4:47 PM</DIV>
<DIV><B>To:</B> <A title=beatnic@comcast.net
href="mailto:beatnic@comcast.net">Alex Fraser</A> </DIV>
<DIV><B>Cc:</B> <A title=tacos@amrad.org
href="mailto:tacos@amrad.org">tacos@amrad.org</A> </DIV>
<DIV><B>Subject:</B> Re: Radio control binding</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV dir=ltr>I looked into this myself a while back. One of the more
popular RC protocol families is Spektrum DSM2 and DSMX. Apparently it's
been completely reverse engineered and there are example implementations out on
the net. The official radios are based on the Cypress CYWUSB6953
PSoC+Radio chip.
<DIV> </DIV>
<DIV><A
href="http://datasheet.octopart.com/CYWUSB6953-48LFXC-Cypress-Semiconductor-datasheet-17723564.pdf">http://datasheet.octopart.com/CYWUSB6953-48LFXC-Cypress-Semiconductor-datasheet-17723564.pdf</A><BR>
<DIV> </DIV>
<DIV><A
href="http://www.cgsy.com.au/archives/215">http://www.cgsy.com.au/archives/215</A>
discusses the DSMX protocol<BR></DIV>
<DIV> </DIV>
<DIV>This post in a larger thread has links to a bunch more info: <A
href="http://www.rcgroups.com/forums/showpost.php?s=07273ba7d35902817e79bbdf30110409&p=7916481&postcount=6">http://www.rcgroups.com/forums/showpost.php?s=07273ba7d35902817e79bbdf30110409&p=7916481&postcount=6</A></DIV>
<DIV> </DIV>
<DIV> </DIV></DIV></DIV>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV class=gmail_quote>On Tue, Jan 20, 2015 at 2:26 PM, Alex Fraser <SPAN
dir=ltr><<A href="mailto:beatnic@comcast.net"
target=_blank>beatnic@comcast.net</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<DIV text="#000000" bgcolor="#FFFFFF"><FONT face="Comic Sans MS">It used to be
that in radio control you picked a frequency for your transmitter and for your
receiver. There were channels on 6 meters and at 72 and 75 MHz. You
depended on being the sole user of a frequency to guarantee that you were in
control. Back then you would tie a ribbon to your antenna which told
every one which channel you were on so no one would accidentally jam your
signal and cause you to lose control</FONT>.<BR><BR>These days the frequency
used has has changed to 2.4 gig. You turn on your receiver and your
transmitter and Bind them. The Transmitter handshakes with the receiver
and they create a unique link. Everyone using the field can use the same
band and the radios don't interfere with each other.<BR><BR>There has been
some threads on this reflector about spread spectrum (ha, an understatement
for sure!) and recently been some talk on syncing signals. I
wonder if folks here have looked at what is happening with modern RC
radios? BTW as I understand it these new transmitters have flash-able
bios and considerable programing capability so there is a possibility of re
purposing the gizmo.<SPAN class=HOEnZb><FONT color=#888888><BR><PRE cols="72">--
\\\\\\\\\\\\\\\\-----++++*0*++++-----//////////////////
No electrons were harmed in the creation of this message
--------------------------------------------------------
~~~********************Alex Fraser********************~~~
--------------------------------------------------------
[[[[[[~~^^^#___=>>>```/\/\**O**/\/\```<<<=___#^^^~~]]]]]]
</PRE></FONT></SPAN></DIV><BR>_______________________________________________<BR>Tacos
mailing list<BR><A href="mailto:Tacos@amrad.org">Tacos@amrad.org</A><BR><A
href="https://lists.amrad.org/mailman/listinfo/tacos"
target=_blank>https://lists.amrad.org/mailman/listinfo/tacos</A><BR><BR></BLOCKQUOTE></DIV>
<DIV> </DIV></DIV>
<P>
<HR>
_______________________________________________<BR>Tacos mailing
list<BR>Tacos@amrad.org<BR>https://lists.amrad.org/mailman/listinfo/tacos<BR></DIV></DIV></DIV></BODY></HTML>