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Hi All,
can i have a high level explanation of why wide loop bandwidth will make pll lock faster but narrow loop bandwidth the pll will difficult lock?
My attempted answer is ,
the wider the loop bandwidth, more VCO noise will be attenuated so the VCO will tune to the right frequency faster...
Hi,
in 8b/10b encoding scheme, why the control character K28.5 is more frequent to be used among the 12 control character.
What is the advantage of K28.5 among all? why the protocol will choose to use this instead of others control character? there must have a reason behind right?
Thanks and...
Yupe...for 315MHz, i use 24cm long antenna and for 433MHz pair, i use 18cm long antenna
hmmm, since it is both ways communication, so both modules should be in use all the time, what do you mean which using electronics switch? such as Transistor?
but may i know how to implement this?
Hello everyone,
i use PIC16f877A USART to do my full duplex communication between 2 controllers....
Initially, i use jumpers, and the communication work well.
Then when i proceed this to RF modules (wireless communication)
then problem start occur. OK, since it is full duplex, so i use...
It never work, i tried in many days already...many way i tried also not working...
the conclusion i made is the PIC not able to manipulate the transmitter and receiver uart together...
but i don't know deal with my coding part.... super FRUSTRATED
Tiger, anyway thanks for your reply and help....
May i know in my interrupt service routine,
can i tranmit 2 byte data go out in sequence?
what i mean is just like
#INT_TBE
void transmit_isr()
{
fputc(0xAA) ;//transmit the first byte header
fputc('C'); //transmit the actual of data character 'c'
}
I doubt that this can work...
Hi,
with the datasheet of PIC 16F877A, state that support in full duplex communication.
I mange to make the half duplex communication working between my 2 MCU. but when come to full duplex , everything become not working.
Can anyone tell me why and guide me to solve this problem?
***
I am...
Hi,
Thanks for the reply, i do digest something from both of you explanation. thank you so much...
Anyway, since i have something doubt,
Mazz say
But Brian say
so transmit nothing is not equal to 0hz????
Then Brian say again
But since only data '1' will be in 315Mhz signal and data 0...
Hi betwixt,
I really appreciate for your explanation. Thank a lot.
Hmmm, i have a very silly question here :oops:
I interpret it that no carrier is mean there is no 315Mhz frequency transmitted out, then when there is 1, carrier being transmitted out.
So that's mean in a byte of data RF...
Hi, thanks for the reply...
Actually i do not have the exact datasheet since i bought in somewhere electronics shop. I juz refer to the internet standard datasheet since they are doing the same thing.
Anyway, i do capture down the snapshot of both of the tx and rx RF module.
There is no...
HI,
as we known PIC is operate at 5V voltage, so may i know if i use the ADC channel,...
can i use the 13V reference voltage which that far exceed the 5v and to interface with the PIC adc channel pin?
Hello,
I am doing a project and trying hard to understand the operation theory of this type of RF module(315Mhz and 433Mhz).
From the datasheet, it say that the RF transmitter just will transmit out the data whenever there 'see' the data at the data pin....Hmmm, in my project, of course i put...
But if in the software, how about i write the different header for different packets. Then in receiver side, only receive with recognize correct header. So, is it method can use?
I did try this before, but once i enable both 315Mhz transmitter in the same time, the whole system cant work.... so...
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