DC Power Cable Change
As with all DC power cables supplied with modern 100 watt transceivers losses can be significant due to the lead length and the line fuses and with this rig the additional RFI filter which is supplied with the Euro/UK version. The lead itself is about 9' long which is more than twice as long as required by most people in a home shack environment. The new lead which I have made is only 4' long and is made with double cables of the same rating as the original lead and uses a single 20Amp blade fuse in the positive line close to the PSU. The difference is immediately apparent when monitoring the drain voltage of the PA devices which can be seen on the rig's metering menu when running full power on FM or CW key down.
I checked the RF output from the rig with the RF POWER set to 100% and with full carrier using the original lead and the new lead and the increase in output power was about 10 watts, this difference being more apparent if the dc supply was between 11.5 and 12v so the losses have have been reduced by a worthwhile amount.
See the pictures below..................
This is the original lead and and filter
RFI Filter with the lid removed
This is the new 4 way cable and the lower picture shows the new 4 pin rig plug
It should be noted that if the transceiver is being used in an "Auto" environment using a car or truck battery that a fuse "MUST" be fitted in the "Negative" lead as well as the "Positive" lead so in these circumstances the supplied lead should be used.