You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
High Amps on Transmit
- Thread starter Nev
- Start date
jakej
Well-Known Member
Not enough info eg -
Did this happen recently or has it been an ongoing issue ?
If it's a recent event - did you change anything eg Com antenna location etc ?
What type of antenna coax cable are you using ? RG58 or RG400 ?
Where is that antenna located on the airframe ?
Did this happen recently or has it been an ongoing issue ?
If it's a recent event - did you change anything eg Com antenna location etc ?
What type of antenna coax cable are you using ? RG58 or RG400 ?
Where is that antenna located on the airframe ?
It's been an ongoing issue since new that I've been slow to address.
So in that regard nothing has changed - it's always done this.
The VHF antenna is mounted underneath the boot cowl. The radio has always worked very well. The cable is RG400.
Thanks.
So in that regard nothing has changed - it's always done this.
The VHF antenna is mounted underneath the boot cowl. The radio has always worked very well. The cable is RG400.
Thanks.
airguy
Well-Known Member
It's not likely that your system is suddenly pulling that much power and the amperage reading is accurate - unless your system voltage is also sagging significantly during transmit - that's easy to verify. Much more likely that you're getting some stray RF into the EMS box that senses the shunt current. Some of the older EMS boxes were more sensitive to RF and it was a known problem back in the 2010's, I know there was a fix for it but you had to send the EMS box back to Dynon.
Short of that, if you have a break in the coax you can be leaking a lot of RF - this is not likely in the coax run itself if you are using RG400, but would probably be at the termination ends, either at the radio or the antenna. Check those ends, cut and recrimp if they are suspect.
Short of that, if you have a break in the coax you can be leaking a lot of RF - this is not likely in the coax run itself if you are using RG400, but would probably be at the termination ends, either at the radio or the antenna. Check those ends, cut and recrimp if they are suspect.