logo
Most Viewed Last 7 Days
GB3YT (YV,YX) (329)
Chirp Sounders (328)
Microsource YIG Synth (328)
11km on 134GHz (328)
13cm 200mW Comtech info (328)
146MHz DATV Tests (328)

Home



Cluster Activity

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

Solar data:
SFI
69
A-Index
4
K-Index
2
Exp.K
1
Sunspots
0
Activity
qui
GMF
qui
Aurora?
no

My Weather

ArrayDate:18/01/19 Time:09:11
Temp:-0.5C
Wind Speed:5mph
Wind Dir:180deg
Pressure:1013.9mB
Humidity:46%
Dew Point:-11.3C
UKHASnet

Watch out with you DC Power connections to the 200mW module!

The module requires a negative bias to the GAasFets in the final stages and this is done by using a virtual ground in the module.

All of the module Ground is held ~1.4v above DC Ground using the two diodes situated next to the tx can

This was only found by accident when in use on GB3KM where the dc ground was shorted to RF ground via the Power supply connections and eventually the Driver GAasFet failed!

A separate ground isolated power supply is required for the TX module at all times!!


200mW DC input

200mW top



200mW Module 6MHz Sound carrier boost:
200mW Module Sound boost


















Last page added:25/03/00 18:32
M0DTS.co.uk