View Single Post
Old 15th Feb 2020, 5:26 am   #16
hiro, JJ1FXF
Triode
 
hiro, JJ1FXF's Avatar
 
Join Date: Jan 2019
Location: CHIBA, Japan
Posts: 33
Default Re: 9R-59D Coil Pack

Are there anyone out there who modified ANT coil to work fine with dipole antenna inserted BALAN in the 50ohm coax cable?

My understanding for the poor receiving sensitivity is caused by my BALAN-inserted DP and 9R-59D’s ANT coils construction which are also works as BALAN to avoid common mode noise from the antenna elements.

One solution is to replace my BALAN to so-called “Floating BALAN” or “common mode filter”, I suppose.

However, this takes much time and I wonder it may cause the worse SWR problem to my other transceivers.

Another mod is to float the SO239 female connector from the 9R-59D chassis.

This is good when using the 9R-59D as an standalone receiver, not connecting to a TX-88D transmitter because antenna comes through the TX-88D to 9R-59D and so the antenna will be GND-ed again at its remote connector which connects transmitter and receiver.

The best way I expect is to mod the ANT coils circuit not to be like an autotransfomer or balan.

If anyone did mod for this issue, please kindly advise me.

Thanks a lot!
__________________
// hiro, JJ1FXF
hiro, JJ1FXF is offline