+ + + - D L 4 X A V - jo 43 xn - h a m b u r g , g e r m a n y , e u r o p e , e a r t h + + +
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modification of a GSM bias tee
for 2 m , 70 cm and 23 cm use

MIKOM Bias Tee / TMA / id-No 145120 / Rev. 00 / SN. 7662 MIKOM
Bias Tee

TMA


id-No. 145120
Rev. 00
SN. 7662
band SWR
bevor mod
SWR
after mod
2 m not testet 1 : 1.2
70 cm 1 : 1.6 1 : 1
23 cm 1 : 1.4 1 : 1.2
now used for 70 cm antenna polarisation switching

FAQ

Q: what is the red line ?
A: The red line shows the way the DC voltage reaches the N-connector on the right side.
Q: how much RF-power can i run thru the box ?
A: the capacitor in the middle of the RF-trace is the limiting factor.
(i use only 10 Watts, but i think the unit survives 100 W. check the capacitor-temperature.)
Q: can i use the unit on shortwave too ?
A: no, the lowest usable frequency depends on the L-value ( VK200 ) and the C-value. in the RF trace. but you can change both values to fit your needs.

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dl4xav 2009