--- In FT817@y..., "Don" <k7ugq@h...> wrote:
I am curious, did switching the NAR allow you to insert the SSB
filter?
Hi Don,
Jerry was installing the CW filter. NAR only works if the CW filter
is installed and CW is selected in Menu 38. (NAR also is used to
switch from wide to narrow FM deviation.)
If you install the SSB filter, the SSB filter is switched in and out
via Menu 38. NAR does nothing. I have both filters (but not in the
rig at the same time regrettably). The SSB filter is a 10-pole
Collins mechanical filter and is very nice. It is very flat over the
passband unlike the stock ceramic filter. Don't expect dramatic
changes like you observe with the CW filter. The SSB filter
effectively boosts the lows and highs (the stock filter rolls off the
highs and lows) and cuts off the very lows and highs that the stock
filter passes. To really appreciate the filter, I found that using
the SP-8 speaker makes a "big" difference. Although I have not had
time to get a audio review by the "178" group, initial reports are
that the audio is clearer, sounds some better, etc. Another result
of the flat passband it that the output is more constant in the PSK
mode as you move about the passband.
If there is interest, I can post more data about the SSB filter.
Perhaps you and I are the only two having this filter!
72 de Barry - W4WB
