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Home > Archive > Electrical Engineering > May 2006 > About HT12D
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| ¡Ý Lok ¡Ý 2006-05-13, 1:21 am |
| Dear All,
I am using a HT12E & HT12D with a RF transmitter and a RF receiver to do a
radio transmission link. Two serial clock pulse (30-100Hz) will be sent with
this link.
When I do the testing, the clock pulse can be sucessfully sent to the
receiver. However, the clock pulse has been slowed down after the decoding.
The output signal from the HT12D become very slow.
Also, the HT12D will only output 'high' (5V) if I change the input
frequency of the clock pulse below 80Hz or larger than 100Hz. That's mean,
it only works with frequency range 80-100Hz and the outuput frequency is
slowed down as well.
How can I solve this problem? Thanks for your help.
Best Regards,
Lok
| |
| TimPerry 2006-05-13, 12:21 pm |
|
"¡Ý Lok ¡Ý" <send_to_lok@hotmail.com> wrote in message
news:44655839$0$15975$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> Dear All,
>
> I am using a HT12E & HT12D with a RF transmitter and a RF receiver to do
a
> radio transmission link. Two serial clock pulse (30-100Hz) will be sent
with
> this link.
> When I do the testing, the clock pulse can be sucessfully sent to the
> receiver. However, the clock pulse has been slowed down after the
decoding.
> The output signal from the HT12D become very slow.
> Also, the HT12D will only output 'high' (5V) if I change the input
> frequency of the clock pulse below 80Hz or larger than 100Hz. That's mean,
> it only works with frequency range 80-100Hz and the outuput frequency is
> slowed down as well.
> How can I solve this problem? Thanks for your help.
>
> Best Regards,
> Lok
>
what are you using for a RF transmitter and receiver? some types use an
audio compression scheme called "compandering". others have a filter in the
audio section to eliminate CTCSS tones.
| |
| ¡Ý Lok ¡Ý 2006-05-14, 12:21 am |
| I am using the TWS-BS3 (433.9MHz) ASK transmitter module and the RWS-371-6
ASK receiver module.
"TimPerry" <timperry@noaspamadelphia.net> wrote in message
news:sNSdnXilCflZafjZnZ2dnUVZ_u-dnZ2d@adelphia.com...
>
> "¡Ý Lok ¡Ý" <send_to_lok@hotmail.com> wrote in message
> news:44655839$0$15975$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> a
> with
> decoding.
>
> what are you using for a RF transmitter and receiver? some types use an
> audio compression scheme called "compandering". others have a filter in
> the
> audio section to eliminate CTCSS tones.
>
>
| |
| **THE-RFI-EMI-GUY** 2006-05-14, 3:21 am |
|
¡Ý Lok ¡Ý wrote:
>I am using the TWS-BS3 (433.9MHz) ASK transmitter module and the RWS-371-6
>ASK receiver module.
>
>
>
>"TimPerry" <timperry@noaspamadelphia.net> wrote in message
>news:sNSdnXilCflZafjZnZ2dnUVZ_u-dnZ2d@adelphia.com...
>
>
>
>
>
>
Can you describe better what you are doing? You can send 4800 bps data
directly through those radios without using the HOLTEK encoder and
decoder chips.
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
| |
| ¡Ý Lok ¡Ý 2006-05-14, 5:21 am |
| I am going to send four sets of clock pulses (30-100Hz) at the same time (in 4 channels). So, I just use the Encoder and Decoder to do the 4 channels transmission. If I just use the TWS-BS3 (433.9MHz) and the RWS-371-6, only one channel can be transmitted.
"**THE-RFI-EMI-GUY**" <rhyolite@nettally.com> wrote in message news:Nez9g.12323$HA2.10602@tornado.tampabay.rr.com...
!Y Lok !Y wrote:
I am using the TWS-BS3 (433.9MHz) ASK transmitter module and the RWS-371-6
ASK receiver module.
"TimPerry" <timperry@noaspamadelphia.net> wrote in message
news:sNSdnXilCflZafjZnZ2dnUVZ_u-dnZ2d@adelphia.com...
"!Y Lok !Y" <send_to_lok@hotmail.com> wrote in message
news:44655839$0$15975$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
Dear All,
I am using a HT12E & HT12D with a RF transmitter and a RF receiver to
do
a
radio transmission link. Two serial clock pulse (30-100Hz) will be sent
with
this link.
When I do the testing, the clock pulse can be sucessfully sent to the
receiver. However, the clock pulse has been slowed down after the
decoding.
The output signal from the HT12D become very slow.
Also, the HT12D will only output 'high' (5V) if I change the input
frequency of the clock pulse below 80Hz or larger than 100Hz. That's
mean,
it only works with frequency range 80-100Hz and the outuput frequency is
slowed down as well.
How can I solve this problem? Thanks for your help.
Best Regards,
Lok
what are you using for a RF transmitter and receiver? some types use an
audio compression scheme called "compandering". others have a filter in
the
audio section to eliminate CTCSS tones.
Can you describe better what you are doing? You can send 4800 bps data directly through those radios without using the HOLTEK encoder and decoder chips.
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"c
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
| |
| **THE-RFI-EMI-GUY** 2006-05-14, 4:21 pm |
| You are limited to the clock speed of the encoder and decoder chips. I
think it is set with a resistor. Why don't you use a
multiplexer-demultiplexer chip?
¡Ý Lok ¡Ý wrote:
> I am going to sendfour sets of clock pulses (30-100Hz) at the same
> time (in 4 channels). So, I just use the Encoder and Decoder to do the
> 4 channels transmission. If I just use the TWS-BS3 (433.9MHz) and the
> RWS-371-6, only one channel can be transmitted.
>
> "**THE-RFI-EMI-GUY**" <rhyolite@nettally.com
> <mailto:rhyolite@nettally.com>> wrote in message
> news:Nez9g.12323$HA2.10602@tornado.tampabay.rr.com...
>
>
> ¡Ý Lok ¡Ý wrote:
>
> Can you describe better what you are doing? You can send 4800 bps
> data directly through those radios without using the HOLTEK
> encoder and decoder chips.
>
>--
>Joe Leikhim K4SAT
>"The RFI-EMI-GUY"?
>
>"Treason doth never prosper: what's the reason?
>For if it prosper, none dare call it treason."
>
>"Follow The Money" ;-P
>
>
>
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"(c)
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
| |
| ≡ Lok ≡ 2006-05-15, 12:21 am |
| I am using a 47K resistor between the pin 15 and 16 (Osc1 and Osc2). The supply voltage is 5V.
How can I increse the speed limitation?
"**THE-RFI-EMI-GUY**" <rhyolite@nettally.com> wrote in message news:44677BFB.8020806@nettally.com...
You are limited to the clock speed of the encoder and decoder chips. I think it is set with a resistor. Why don't you use a multiplexer-demultiplexer chip?
≡ Lok ≡ wrote:
I am going to send four sets of clock pulses (30-100Hz) at the same time (in 4 channels). So, I just use the Encoder and Decoder to do the 4 channels transmission. If I just use the TWS-BS3 (433.9MHz) and the RWS-371-6, only one channel can be transmitted.
"**THE-RFI-EMI-GUY**" <rhyolite@nettally.com> wrote in message news:Nez9g.12323$HA2.10602@tornado.tampabay.rr.com...
≡ Lok ≡ wrote:
I am using the TWS-BS3 (433.9MHz) ASK transmitter module and the RWS-371-6
ASK receiver module.
"TimPerry" <timperry@noaspamadelphia.net> wrote in message
news:sNSdnXilCflZafjZnZ2dnUVZ_u-dnZ2d@adelphia.com...
"≡ Lok ≡" <send_to_lok@hotmail.com> wrote in message
news:44655839$0$15975$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
Dear All,
I am using a HT12E & HT12D with a RF transmitter and a RF receiver to
do
a
radio transmission link. Two serial clock pulse (30-100Hz) will be sent
with
this link.
When I do the testing, the clock pulse can be sucessfully sent to the
receiver. However, the clock pulse has been slowed down after the
decoding.
The output signal from the HT12D become very slow.
Also, the HT12D will only output 'high' (5V) if I change the input
frequency of the clock pulse below 80Hz or larger than 100Hz. That's
mean,
it only works with frequency range 80-100Hz and the outuput frequency is
slowed down as well.
How can I solve this problem? Thanks for your help.
Best Regards,
Lok
what are you using for a RF transmitter and receiver? some types use an
audio compression scheme called "compandering". others have a filter in
the
audio section to eliminate CTCSS tones.
Can you describe better what you are doing? You can send 4800 bps data directly through those radios without using the HOLTEK encoder and decoder chips.
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"�
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
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