Icom IC-706MKII Manual page 8

KB2LJJ Radio Mods Database
145 70,30
150 72,20
155 60,00
160 39,50
163 29,90
165 22,10
167 15,50
169 10,60
171
174
178
183
190
195
199.995
400
405 14,10
410 18,30
415 20,70
420 24,10
425 31,10
430 30,20
435 29,20
440 30,90
445 30,30
450 28,00
455 27,40
460 20,60
463 14,50
466
468
470
2-30MHz plug
2-30Mhz plug / 25-60MHz plug
25-60MHz plug
25-60MHz plug / 100-250MHz plug
100-250MHz plug
200-500MHz plug
Expand only mod for the IC-706MkII
It should be well know, that the IC-706mkIIG does not offer the best frequency stability. You might have already recognized this
if you ever used your 706 for modes like JT65. For these modes is it very important to have a very low frequency drift.
Unfortunately, the TCXO (CR-282) doesn't really help in this case. It does improve the stability but not really the drift during the
first minute which is the most important one in WSJT since the TX-time is less than a minute. This modification consists two
things, replacing a varicap-diode by a capacitor and give the fan some power so he runs even in receive mode. Once this
modification is done, the frequency stability is improved a lot as seen in picture 1.
http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (8 di 30)23/08/2009 23.05.07
48
52
34
15,5
9
5
2,5
1,2
7,40 0,5
4,40 -
1,91 -
0,33 -
0,16 -
0,35 -
0,60 -
6,33 0,8
3,8
6
7,5
10
17
16
15
16
16
14
13
8.5
4.5
7,80 1.6
4,50 0.6
2,35 -
Not reliable
46,05
48,59
33,42
14,31
8,10
4,35
2,08
0,93
0,43
0,13
0,01
0,00
0,00
0,00
0,00
0,30
1,70
2,94
3,80
5,20
8,78
8,27
7,72
8,67
8,32
7,08
6,77
3,76
1,81
0,48
0,14
0,03