Topband: Connecting Rx antenna to FTDX101

[Sam Josuweit]

I have a FTDX-3000D and the best general info I could find was not to exceed
30db on the RX port. How did you measure the voltage? I built a small square
law detector to measure the voltage on my RX antennas during transmit and
took some reading with full power just to be sure.

Sam(N3XZ)

-----Original Message-----
From: Topband [mailto:topband-bounces+samjos=epix.net at contesting.com] On
Behalf Of Miroslaw Paczocha
Sent: Friday, January 17, 2020 9:47 AM
To: topband at contesting.com
Subject: Topband: Connecting Rx antenna to FTDX101

Hi,

I intend to connect a K9AY antenna to socket 3 of an FTDX101D, this socket
being menu configured as Rx input. The problem is I measured about 1,5 V on
the K9AY coax loaded with 50 ohms with 100W forwarded to the Tx antenna and
I wonder if it is safe for the Rx part of the radio. With full power it
would be several times more! I did not find requested information in the
manual nor any of known Yaesu dealers has been able to answer my question.
Going T/R in this configuration I can hear relay noise in the rig so may I
assume all will be correct however a mistake would be very expensive.
Can someone give me a reliable information about the safety of the radio?

73, Mirek
SP5ENA

PS. I realize perfectly that is not a good sign having so much power induced
in the Rx antenna.

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