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The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

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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