2852
« on: 2010-09-09, 09:24:55 »
Hi see answers below
1) What is the spec of the jumper wires. I want to redo the jumpers just in case there is a bad connection. The wires bend very easily and are difficult to re-use once they are bent?
EKUX red 0,28mm² diam 0,6 mm
2) Would doing the mic gain mod help overcome the problems we are having?
No it has nothing do to with RFI, but the settings has to match, to get the right levels.
Have you tried to increase the LF-levels trough the system so you can reduce the mic gain on the radio, probably it get less sensitive to RF with lower mic gain ?
3) Would it help to put the RRC in a screened box?
No my experience is that this is an error in the TS-480 which causes this problem. The engineer must have had a bad day when developing the TS-480 mic amplifier. The problems are caused by ground problems. Im not aware of any of these problem with any other rig, even Kenwood rigs. If you have RS-232 ports connected to the RRC, test to remove them, ground loops via the RS-232 eq. get things worse also.
4) Would it help to put a 1:1 decoupling transformer in the mic connection between the RRC and Rig?
No,there is already a 1:1 transformer in the RRC ( see pdf.manual). I think issolating the other signals would be more effecive but it's not that easy of course
5) There are a number of errors and inconsistencies in the Kenwood documentation for the RJ45 mic connector
a) pin numbering is non-conventional
b) the mic ground and system ground pins are swapped round in the User Manual
Can you confirm that the wiring schematic for the RJ45 lead from RRC to Rig, and the jumper wiring diagrams are correct bearing in mind these errors.
As far as I know my drawings are correct, I understand from this forum other people has verified it also.
73,
Mike
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