JOTA 40 TRX D.I.Y Workshop by QARL on 13th,14th and 15th of

News to HamRadioIndia Home page

JOTA 40 TRX D.I.Y Workshop by QARL on 13th,14th and 15th of

Postby sinosh » Wed Jul 06, 2011 2:12 pm

ALL are invited!! but with a valid amateur licence. Jota TRX is a simple SSB (LSB) only, single conversion, 40M transceiver designed by VU2DEV, OM Ramaprabhu. It works on 12Volts Battery and outputs a Minimum Power of 15Watts average (30 watts pep) at 13.8 Volts sufficient to contact Soth-India and a few operators have contacted as far as Germany, South Africa etc running only a good Dipole antenna! The proposed workshop’s main aim is to promote HomeBrewing! As such this project is NOT meant for beginners.

Brief Tech Description:

This TRX is a singleconversion ssb rig. (lsb only)
The Local Oscillator (VFO) is a standard 5MHz requirement and hence the IF (Intermediate Frequency) is 12 MHz. So 12-5 = 7 MHz. Hence VFO tunes backward! That means an exact 5 MHz VFO gives 7MHz output whereas 4.9MHz VFO gives 7.1MHz.
The rig is kept simple by having a separate RX and a separate TX with common VFO to give Transceive operation.

Switching is done by a Double pole Relay and frontpanel switch functions as a PTT. The rig is originally meant for Scouts/Guides JOTA (Jamboree on The Air) activity and hence they needed a Send-Receive switch rather than a normal pushbutton switch.

For registration and for more details, contact VU3HLX Nakesh on 9895654344.

CU 73
Posts: 18
Joined: Wed Mar 01, 2006 12:33 pm
Location: Chennai

Return to News

Who is online

Users browsing this forum: No registered users and 2 guests