On Feb 4, 2:33 am, " wrote:
On Feb 3, 8:43 am, wrote:





Hi

Thanks for your replies everyone. My main reason for asking is that I
also have a Yaesu FRG-100 with the Kiwa audio mod and and Kiwa filter
modules (3.7 and 6 KHz). Running the two receivers off the same
antenna, I find that the FRG-100 is slightly more sensitive to very
weak signals. I know that for SSB the R71 has the advantage of the
notch filter, but tuning AM signals either normally or using ECSS, I
can find almost no signals on which the R71 outperforms the FRoG. The
R71 does perhaps have a slight edge when dealing with nearby
interference but I'd definitely say the FRoG is quieter and more
sensitive.

Given the fact that the R71 is generally more highly rated, I find
this surprising. I've got the Passport White Papers for both receivers
and it is true that they found the FRG-100 to be more sensitive than
the R71. In fact it ranks as about the most sensitive receiver they've
tested but the R71 was a bit of a legend for DXing about 20 years ago
so I'm surprised that the FRoG can match it most of the time and beat
it some of the time. As I've realigned my receiver with the help of a
technician friend, do you think my R71 is faulty? Has anyone else had
these two receivers side-by-side?

Cheers

Andy

The FRG-100 is a hard receiver to beat sensitivity wise, probably due
to the excellent S/N ratio. Plus the KIWA audio and filter mods
definitely help. Keep in mind that the R71 design, although state of
the art in its time, is a bit dated now and quadruple conversion has
tradeoffs. Most of its problem is probably the horrible audio
characteristics. Your comparison of the two doesn't surprise me in the
least.

Frank- Hide quoted text -

- Show quoted text -

Hi Frank

Good to hear from you again. The Yaesu is excellent but I was still a
bit worried about my R71's performance so with the service manual and
help from a tech friend, I went through the whole sensitivity setting
procedure again. I must have screwed up first time round. The R71 now
comes close to matching the FRG-100 for sensitivity, the difference
usually being negligible. You're right about the FR0G's audio being
better, though.

Cheers

Andy