Yaesu FT-847 Modification Manual page 10

Complete RX set with LNA having about 20dB of gain - which can/should be
adjusted to suit needed overall gain of receiver and keep lowest noise figure of RX.
At least we need control and/or set proper gain parameters of the receiver "RX-
CHAIN" in the Service Menu of transceiver, as they may vary depending on the TRX
age and production changes introduced by Yaesu.
Here's a pic of already mounted filter on the receive path FT-847:
After few mods we can say that theses prototype filters are fully useful.
Obtained sensitivity of 0.12uV MDS, and the TX power at almost 60W level with
dramatically improved purity of the signal spectrum and efficiency of your TX.
Disclaimer:
The following article is for information purposes only, we will be not responsible for
any failures/damages of your transceiver, and we will not take part in any discussion
about the superiority of the same solutions over other commercially available ham
radio market.
A detailed description of the implementation of mod based on these modules is
described by Greg SP3RNZ In the second part of this study.
If you have any questions, concerns, or need to improve your radio - write to
me:
sp3rnz@wp.pl sp2dmb@gmail.com or visit my website:
73 - Peter SP2DMB, Greg SP3RNZ
www.sp2dmb.cba.pl