View Index by Level
RANDOM PAGE

SITE SEARCH

LOG
IN

SIGN UP

HELP

Double Sideband Transmitter


This is the AQA version closing after June 2019. Visit the the version for Eduqas instead.

To gain access to revision questions, please sign up and log in.

Non-Exam Extras

A Transmitter Using Heterodyne Methods with a Mixer

Proposed System Diagram

With the narrow bandwidth of the ultrasound transducer at 40 +/- 1 kHz, only one of the two sidebands will be transmitted strongly.

Ultrasound-DSB-TX.gif

This Circuit Has Been Tested - See Comments Below

Ultrasound-DSB-TX-CCT.gif

A student has now built a DSB transmitter based on this circuit.

PSK31: The Mixer Output - The Y axis in in Volts - The X axis shows 40kHz.

SA602-Mixer-Output.gif

The BPSK31 PC software was downloaded here. The Digital Master 780 program within the Ham Radio Deluxe suite was used. This used to be funded by donation. Now it costs $100. You can get a 30 day trial though.

Mark 2 Circuit

Ultrasound-DSB-TX-CCT-2.gif

BPSK31 Transmitter Output - Note the Phase Reversal

Ultrasound-DSB-Scope-2.gif

 

 

 

reviseOmatic V3     Contacts, ©, Cookies, Data Protection and Disclaimers Hosted at linode.com, London