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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Synthesized Radios
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Synthesized Radios - 7/24/2003 1:10:50 AM   
beardking



Posts: 886
Joined: 12/11/2002
From: The Colony, TX, USA
Status: offline 		Ok, I've got a question here. I've been seeing the new Royal Evo and Polk Tracker II radios and something makes me wonder. These radios allow you to choose which frequency you are going to fly on, which seems like a good thing. But, since you don't have a set frequency you can't really take a frequency pin from the board (or however your club does frequency control). So, say you decide to use channel 52, how does the person that drives up and unloads while you are out flying know that you are on 52? Or are you supposed to go get a different pin each time you decide to change your frequency?

I've also heard that these radios aren't sanctioned by the AMA because they don't have a set frequency, anyone heard that?

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Synthesized Radios - 7/24/2003 1:17:24 AM   
4*60


 

Posts: 1267
Joined: 3/10/2002
From: Blind Bay, BC, CANADA
Status: offline 		Better get the right pin every time at our club and events or you are dog meat.

PS: After reading later posts I realized that some people need smileys to indicate a joke. I also thought it was a joke but also an explanation at the same time. If my humour escapes some people, I hope they don't get ulcers or have a heart attack as a result. I will try not to be so funny in the future.

< Message edited by 4*60 -- Jul 29 2003 12:23AM >

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Synthesized Radios - 7/24/2003 1:21:38 AM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		Yes you can choose the channel you use, but having done that, it's exactly the same as if you only had one channel. If you choose, say, channel 52, you use that channel in the same way as if you had no choice and Ch 52 was your only channel.

You still have to put your channel pin up, and others cannot then use it.

All the synthesiser does is allow you to use a channel you can specify.

Synthesisers are legal in the USA. What you can't do is change the crystal in your transmitter yourself, without then sending it off to the manufacturer who will fine tune it to that chosen channel.

Synthesisers do the fine tuning job for you.

-David C.

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Synthesized Radios - 7/24/2003 1:23:54 AM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]Originally posted by 4*60
Better get the right pin every time at our club and events or you are dog meat. [/QUOTE]

I think you'll find he needed some explanation, not a threat.

I could be wrong though . .

-DC

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Synthesized Radios - 7/24/2003 1:29:04 AM   
beardking



Posts: 886
Joined: 12/11/2002
From: The Colony, TX, USA
Status: offline 		Thanks David, the explanation was definitely more useful than a threat.

Do these transmitters have some sort of fail safe to keep you from grabbing onto a channel that someone else is using at that moment?

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Synthesized Radios - 7/24/2003 1:36:42 AM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]Originally posted by beardking
Do these transmitters have some sort of fail safe to keep you from grabbing onto a channel that someone else is using at that moment? [/QUOTE]

Well, sort of.

Both the radios you mentioned have a scanner (std on the Tracker, and optional on the Multiplex) that tells you which channels are in use without the radio actually transmitting on any channel at the time.

You can then choose an empty channel, but there is nothing built in to stop you using one that is already in use, and therefore, I believe, becoming dog meat .

There's a special 'dog meat' option if you choose a channel already in use.



-David C.

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Synthesized Radios - 7/24/2003 1:41:43 AM   
JohnBuckner



Posts: 3999
Joined: 12/23/2001
From: Kingman, AZ, USA
Status: offline 		The Hitec Spectra system is a removeable module type and the freq is selected on two tiny slotted indented pots. The module must be removed to change and no chance of an accidental change while handeling the radio. I beleive Futabas system works similarly but not sure. I don,t know how the Trackers handels this.

The first synth tx to actually hit the market in the US was a Kraft radio sometime around the early eightys or thereabouts. It's freq was selected externally there was major political concern over this at the time and probably contributed to its failure in the marketplace.

John

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"Keep your controllines tight"

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       Post #: 7

]The Tracker will not let you turn on to a channel that... - 7/24/2003 1:48:28 AM   
causeitflies



Posts: 357
Joined: 1/1/2003
From: Steubenville, OH, USA
Status: offline 		There are basically two methods of frequency control.
One type is that you put your personal pin on the frequency you are going to use. It "may" be required that this pin also display the channel number to make sure it goes in the right place.
The other method requires the flier to remove the frequency pin from the board and place it on his TX. Some clubs require your AMA card be placed in the slot the pin was in.

I have the Tracker II and when using the second method at one club there is no problem. I just pick my frequency, remove the pin, place my AMA card in the slot, and go fly.

At the other club for now I just place a blank personal pin on the board on the channel I will use. But since I like to label my pins with the channel number you can see that I would need a bag full of different pins

As a solution I am going to make a mini white board on one pin and use an erasable marker to indicate the channel .

The Tracker will not let you turn on to a channel that is in use

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Mark P
An Expert has made every mistake - A Master has made every mistake twice

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Synthesized Radios - 7/24/2003 1:53:03 AM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]Originally posted by causeitflies
. But since I like to label my pins with the channel number you can see that I would need a bag full of different pins

As a solution I am going to make a mini white board on one pin and use an erasable marker to indicate the channel . [/QUOTE]

I have chosen to use crystals in the receivers on channels 15, 51, 45 and 54 so I just have to swap two sets of numbers around on the pin flag.



-DC

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Synthesized Radios - 7/24/2003 1:54:39 AM   
causeitflies



Posts: 357
Joined: 1/1/2003
From: Steubenville, OH, USA
Status: offline 		There is no module to remove in the Tracker II. All changes are done on the screen. So there are no switches or connections to wear out.

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Mark P
An Expert has made every mistake - A Master has made every mistake twice

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Synthesized Radios - 7/24/2003 1:54:41 AM   
dant-RCU


 

Posts: 647
Joined: 12/7/2001
From: Tulsa, OK, USA
Status: offline 		The Tracker II (Polk's entry into the synthesizer market) will not allow you to select and transmit on a frequency that is already being used. I tried it myself and the Tx simply will not select an in use channel.

The frequency selection in the Tracker II is software inside of the Tx and not external as with the HiTec Spectra (which I also happen to have with an Eclipse at this time). The Tracker II then records the channel you have selected with the aircraft number you have selected and it remains the specific channel for that aircraft until it is changed.

The Seeker II (Polk's synthesized receiver) also stores the channel you set until you reset it. The receiver is also software set and has no external setting devices.

I have no knowledge of the Multiplex radios but I do own a Tracker II Tx and 5 Seeker II Rx's.

Dan


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Dan Taylor
American Turf Flyers, Inc.

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Synthesized Radios - 7/24/2003 1:56:48 AM   
beardking



Posts: 886
Joined: 12/11/2002
From: The Colony, TX, USA
Status: offline 		So, if you have, say, the Multiplex radio, can you use it with receivers that have crystals, but still be able to use the synthesis function on the TX? (i.e. have 3 different planes with 3 different channels on the RX, but use only the one TX).

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LAND? I haven't even taken off yet.

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Synthesized Radios - 7/24/2003 1:58:51 AM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]The Tracker II (Polk's entry into the synthesizer market) will not allow you to select and transmit on a frequency that is already being used. I tried it myself and the Tx simply will not select an in use channel[/QUOTE]

Really? I didn't know that. That's pretty clever.

Hmm! that's another excuse for not buying one gone!

Oh well

:

David C.

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       Post #: 13

Synthesized Radios - 7/24/2003 1:59:39 AM   
causeitflies



Posts: 357
Joined: 1/1/2003
From: Steubenville, OH, USA
Status: offline 		Wow!! That's some really close posting times Wish I could type faster

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Mark P
An Expert has made every mistake - A Master has made every mistake twice

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