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Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it here. Thanks!


Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

Post subject: BPSK MODULATOR DESIGN Posted: Fri Oct 07, 2005 9:46 pm
Hi friends,

I want to design BPSK modulator for my communication system.I am very new to this stuff.I want to modulate 2 signals like one is information signal 1 khz freq while other is PN code 1 MHz freq ,and i want to modulate this signal using BPSK technique,but i dont have any idea about how to implement BPSK in hardware.

Could you please let me know that how can i achive this BPSK modualtion using hardware?could you please send me some basic idea, circuit or somthing which can help me to move ahead ?



Post subject: Posted: Sat Oct 08, 2005 12:30 am
Step number 1.


Post subject: Posted: Sat Oct 08, 2005 12:34 am
Buy a 1k ohm resistor.

Let me know when you've done that and I'll tell you the next step.


Another Guest
Post subject: BPSKPosted: Sun Oct 09, 2005 7:02 pm
You need either a double-balanced mixer (see or its digital equivalent, the exclusive-OR gate. Exor your 1kbps data with your 1 Mbps PN stream, then go to your modulator (dbm or exor) at whatever frequency you need..

Good Luck!


Post subject: BPSK modulatorPosted: Mon Oct 10, 2005 3:26 am
Anonymous wrote:
Buy a 1k ohm resistor.

Let me know when you've done that and I'll tell you the next step.

Hi ,I have 1 K resistor with me.
could u please let me know the next steps in detail?



Post subject: bpsk modulatorPosted: Mon Oct 10, 2005 3:50 pm
Hi guest,

i do have 1 K resistor wid me cud u please let me know the next step?



Can - Helper
Post subject: Posted: Sun Oct 16, 2005 9:36 pm
Use double balanced mixer (DBM) with DC - Fmax response. Also find out more about DC offset.


Post subject: BPSK ModPosted: Sat Oct 29, 2005 1:08 pm
Did you ever try using a MAXIM device such as the MAX2900? They have an evaluation board available.

It's better then a 1K resistor.


Posted  11/12/2012

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