KB2LJJ Radio Mods Database
Transmit power output after modification
Power output in watts as measured from an uncalibrated Diawa CN-620 wattmeter with vhf,uhf dummy load. Power output on
radio set to highest level.
FREQ
FM PWR AM CARR FREQ
FM PWR
105 MHz
1.0
0.0
400 MHz
2.0
110
1.0
0.0
405
7.0
115
2.0
0.0
410
9.0
118
3.5
0.7
415
10.0
120
5.0
1.0
420
12.0
125
14.0
3.5
425
15.0
130
20.0
15.0
430
18.0
135
25.0
17.0
435
20.0
140
28.0
18.0
440
20.0
145
32.0
18.0
445
19.0
150
32.0
18.0
450
18.0
155
20.0
18.0
455
15.0
160
13.0
10.0
460
8.0
165
6.0
1.5
465
0.8
170
1.5
0.0
467
0.15
175
0.5
470
0.00
180
0.1
185
0.0
These are the readings I took after performing the mod. I took readings at key frequencies throughout the band to measure the
efficiencies of the different band pass filters, especially in the HF band. The attenuation at the edges of the filters are very visible
especially at the 8MHz cross point.
All readings were took with a bird wattmeter and a home made RF voltmeter, the latter is not reliable over 200MHz.
Thanks. Olivier, VE2NSM.
MHz
V @ 50 Ohms
W from Bird
Wattmeter
W from RF Voltmeter
0.1
0,00
-
0,00
0.2
0,04
-
0,00
0.3
0,31
-
0,00
0.5
1,95
-
0,01
0.65
4,16
-
0,11
0.75
8,60
1,5
0,59
http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (6 di 30)23/08/2009 23.05.07
