Monday, August 8, 2011

Para Dynamics PDC 5 Antenna Matcher

PDC 5 Matcher

The Para Dynamics PDC 5 was basically a tuner and SWR and wattmeter. The Tuner section consisted of a tune and load capacitor (mylar). There was a switch to take the tuner out of the circuit. Power rating was 100 watts PEP. Three wattage settings of 1,10,100. SWR had a slider to set the full scale (bottom knob).
The unit seemed to be capable of tuning a load of 3:1 down to a respectable SWR of 1.5 or less. The 100 watt rating was PEP and I would not run more than that due to the small compression style capacitors and the possibility of arcing. 

I assembled an insertion loss chart below. The PDC 5 was calibrated for 27MHz and the range could be set for 14-28MHz with low insertion loss but it would have to be calibrated for that frequency to be accurate due to the omission of a directional coupler.

Insertion Loss Chart
Frequency in MHz
Loss in -dB
1.8
-.15
3.5
-.10
7.1
-.06
14.3
-.02
21.0
-.01
24.0
-.02
28.0
-.05
30.0
-.05
54.0
-.13
146.0
-.64
225.0
-1.2


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