Icom hm-7 mic question

[SV2BFI]

I found on the net the schematic of icom's HM-7
handy powered microphone.
I can't unterstand if one of the three resistors value
is 18KOhm or 1.8KOhm.

73
SV2BFI

 

[KE5MC]

Looking at the schematic it is difficult to tell.

I believe it is 1.8K.

1. compared to the 10K number the spacing is slightly wider between the 1 and 8.
2. looks to be a hint of a period between the 1 and 8.
3. resulting bias on the transistor is more in line with 1.8 than 18.

Mike

I found on the net the schematic of icom's HM-7
handy powered microphone.
I can't unterstand if one of the three resistors value
is 18KOhm or 1.8KOhm.

73
SV2BFI

 

[SV2BFI]

Looking at the schematic it is difficult to tell.

I believe it is 1.8K.

1. compared to the 10K number the spacing is slightly wider between the 1 and 8.
2. looks to be a hint of a period between the 1 and 8.
3. resulting bias on the transistor is more in line with 1.8 than 18.

Mike

Finaly it is 1.8K
I found it at a lapanese site !!!
Thank you Mike
73