TWS/RWS 434 RF Question
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I'm building a wireless model rocket launcher and I am using a TWS/RWS 434
TX/RX in both the remote and the base unit. Both rx/tx pairs work fine on
their own, but when I try to transmit with both transmitters at the same
time the signal gets cancelled out or something and neither of the receivers
picks up a signal. Any help on a solution to this problem would be greatly
appreciated.
Mike
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TX/RX in both the remote and the base unit. Both rx/tx pairs work fine on
their own, but when I try to transmit with both transmitters at the same
time the signal gets cancelled out or something and neither of the receivers
picks up a signal. Any help on a solution to this problem would be greatly
appreciated.
Mike
_________________________________________________________________________
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Comments
transmitting.
Don't over look safety issues here!!!
You'd hate to have a rocket launched up your nose due to the neighbor kid
playing with his walkie-talkie!!...
Original Message
From: Michael Narwold [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=c9Oild9W6EUYM3hWpqS9NIm3LM677PzNtxu_MpXNYyk4nonUZ1lYrXonfLIi5O679fcyJW_ZPedw9g]mnarwold@h...[/url
Sent: Monday, October 23, 2000 10:10 AM
To: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] TWS/RWS 434 RF Question
I'm building a wireless model rocket launcher and I am using a TWS/RWS 434
TX/RX in both the remote and the base unit. Both rx/tx pairs work fine on
their own, but when I try to transmit with both transmitters at the same
time the signal gets cancelled out or something and neither of the receivers
picks up a signal. Any help on a solution to this problem would be greatly
appreciated.
Mike
_________________________________________________________________________
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Why not use a single transmitter with an encoder/decoder setup for controlling
both receivers..? This should take care of the problem you're having with the
operation of two separate transmitter/receivers in close proximity.
As Michael Witherspoon mentioned earlier, it would help eliminate to possibility
of the rocket up the nose occurrence as well by forcing each receiver to respond
only when an address match is received.
A single transmitter using an encoder/decoder scheme can control quite a few
receivers.
Regards,
Bruce
webmaster@r...
http://www.rentron.com
Original Message
From: "Michael Narwold" <mnarwold@h...>
To: <basicstamps@egroups.com>
Sent: Monday, October 23, 2000 11:10 AM
Subject: [noparse][[/noparse]basicstamps] TWS/RWS 434 RF Question
| I'm building a wireless model rocket launcher and I am using a TWS/RWS 434
| TX/RX in both the remote and the base unit. Both rx/tx pairs work fine on
| their own, but when I try to transmit with both transmitters at the same
| time the signal gets cancelled out or something and neither of the receivers
| picks up a signal. Any help on a solution to this problem would be greatly
| appreciated.
|
| Mike
|
| _________________________________________________________________________
| Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
|
| Share information about yourself, create your own public profile at
| http://profiles.msn.com.
|
|
|
|
|
tells me whether the ignitor has a good connection and also after the launch
to see in the ignitor fired. I am using two different addresses for each
TX/RX pair, but it's not working how I expected it.
>From: "Bruce" <breyno2@r...>
>Reply-To: basicstamps@egroups.com
>To: <basicstamps@egroups.com>
>Subject: Re: [noparse][[/noparse]basicstamps] TWS/RWS 434 RF Question
>Date: Mon, 23 Oct 2000 13:07:21 -0600
>
>Mike,
>
>Why not use a single transmitter with an encoder/decoder setup for
>controlling
>both receivers..? This should take care of the problem you're having with
>the
>operation of two separate transmitter/receivers in close proximity.
>
>As Michael Witherspoon mentioned earlier, it would help eliminate to
>possibility
>of the rocket up the nose occurrence as well by forcing each receiver to
>respond
>only when an address match is received.
>
>A single transmitter using an encoder/decoder scheme can control quite a
>few
>receivers.
>
>Regards,
>
>Bruce
>webmaster@r...
>http://www.rentron.com
>
>
>
Original Message
>From: "Michael Narwold" <mnarwold@h...>
>To: <basicstamps@egroups.com>
>Sent: Monday, October 23, 2000 11:10 AM
>Subject: [noparse][[/noparse]basicstamps] TWS/RWS 434 RF Question
>
>
>| I'm building a wireless model rocket launcher and I am using a TWS/RWS
>434
>| TX/RX in both the remote and the base unit. Both rx/tx pairs work fine
>on
>| their own, but when I try to transmit with both transmitters at the same
>| time the signal gets cancelled out or something and neither of the
>receivers
>| picks up a signal. Any help on a solution to this problem would be
>greatly
>| appreciated.
>|
>| Mike
>|
>| _________________________________________________________________________
>| Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
>|
>| Share information about yourself, create your own public profile at
>| http://profiles.msn.com.
>|
>|
>|
>|
>|
>
>
>
>
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Using two transmitters in close proximity at the same frequency
will cause interference. If you have only one transmitter operational
at any given time, it can work. Operating both at the same time
will not. This would require totally separate channels like you see
with hobby airplane type RF remote control systems.
If you can figure out a way to synchronize the two separate transmitters
and have only "one" transmitting at a time, it will work. Even a short
delay should get you in the ball-park.
Bruce
webmaster@r...
http://www.rentron.com
Original Message
From: "Michael Narwold" <mnarwold@h...>
To: <basicstamps@egroups.com>
Sent: Monday, October 23, 2000 4:54 PM
Subject: Re: [noparse][[/noparse]basicstamps] TWS/RWS 434 RF Question
| The reason I need two TX is taht I am sending a signal from the base that
| tells me whether the ignitor has a good connection and also after the launch
| to see in the ignitor fired. I am using two different addresses for each
| TX/RX pair, but it's not working how I expected it.
you'd do better to have strobed LEDs [noparse][[/noparse]or zenon bike lite]
to show the ignitor connection and post condition. Visually.
I don't like the idea of having a transmitter working next
to the firing receiver whatever the coding may be... too much
room for error [noparse][[/noparse]I almost lost my life in a pyrotechnic
accident 50 years ago so I know something about this :-) ].
<><><>
Date: Mon, 23 Oct 2000 17:54:19 EST
From: "Michael Narwold" <mnarwold@h...>
The reason I need two TX is that I am sending a signal from the base that
tells me whether the ignitor has a good connection and also after the
launch
to see in the ignitor fired. I am using two different addresses for each
TX/RX pair, but it's not working how I expected it.
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the launch pad transmitter on intermittently for a
short time and DISABLE the launch pad _receiver_ just
before till just after the transmitter has sent its
information. Say .1 second before till .1 second
after a .5 second transmitter pulse every two seconds.
[noparse][[/noparse]assuming the decoders and filters work this fast].
Then your pad receiver is active more than half the time
with less than a second delay... anyhow this sort of
reasoning can lead to somewhere workable and safe...
I'd still prefer no transmitters near the firing receiver.
<><><>
Date: Mon, 23 Oct 2000 17:54:19 EST
From: "Michael Narwold" <mnarwold@h...>
The reason I need two TX is that I am sending a signal from the base that
tells me whether the ignitor has a good connection and also after the
launch
to see in the ignitor fired. I am using two different addresses for each
TX/RX pair, but it's not working how I expected it.
End forwarded message
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