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Archive2 - DATV Transmitter (133)


Cluster Activity

Spots per uW band today:
UK spotter or spotted only.

Solar data:
SFI
78
A-Index
12
K-Index
3
Exp.K
0
Sunspots
22
Activity
eru
GMF
qui
Aurora?
no

My Weather

Date:23/09/17 Time:22:34
Temp:16C
Wind Speed:12.5mph
Wind Dir:180deg
Pressure:1017.69mB
Humidity:118%
Dew Point:19.6C
UKHASnet
3.4GHz Airspan Board mods

3.4GHz board mods for ATV

Here is some info on the 3.4GHz boards from Mainline on ebay - None left Dec 2012.


RF/Antenna connections :

Here the RX and TX lines can be connected to an RF relay to switch from RX/TX to the antenna.

PA




TX IF circuit:

TX driver input is fed into the TX mixer through FL7

FL7 is a lowpass filter ( Lowpass 1.1GHz! )


IF Input





VCO/PLL:

VCO is replaced and PLL reference oscillator signal is applied.

PLL interface connections are accessible at the control part of the board.


VCO PLL







PA Enable

2k2 resistor from 5v to base of Q38 to enable the final stage of the PA
power output is 200-400mW max (when not going through the output filter FL6)

PA Enable






PLL control

This is not finished yet but here is some Picbasic code to control the PLL chip and set it to 2170MHz

Designed for a 12F675

PLL Control







The information here is just for reference...

I have not had time to properly test all of the mods so think about it before you do it and let me know the errors!!!










Last page added:16/08/17 15:45
M0DTS.co.uk