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SSB Filter Selection - Performance

 

--- 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
Pres Waterman
 

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.

Sounds like you are the first one to really say the SSB filter is worth
anything. Maybe all of us ASSUMED since the specs were so close that the
reality would be ho-hum

You know, it seems so open inside the rig in that area ( from memory )...do
you think it would be possible to cram 2 in and somehow switch them?

I imagine you may have one-of-each in your 2 FT-817s?

Thanks

Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!
Don
 

I am very interested in any data you have about the SSB filter. At first
"blush" the SSB filter is a waste of money. However, I have heard from
others that it is a good "refinement" for the FT-817.

----- Original Message -----
From: <w4wb@...>
To: <FT817@...>
Sent: Monday, June 04, 2001 8:23 AM
Subject: [FT817] SSB Filter Selection - Performance


--- 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







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--- In FT817@y..., "Don" <k7ugq@h...> wrote:
I am very interested in any data you have about the SSB filter. At
first
"blush" the SSB filter is a waste of money. However, I have heard
from
others that it is a good "refinement" for the FT-817.
OK Don, I will try to put something together soon and post it.

72 de Barry - W4WB
 

Sounds like you are the first one to really say the SSB filter is
worth anything. Maybe all of us ASSUMED since the specs were so close
that the reality would be ho-hum

You know, it seems so open inside the rig in that area ( from memory
)...do you think it would be possible to cram 2 in and somehow switch
them?

I imagine you may have one-of-each in your 2 FT-817s?

Thanks

Pres Waterman W2PW
Well, one will remain filterless for the time being and the other gets
filter swaps when needed.

Yes, the "gross" specs lead us all to think that the filters were very
much the same, but not so I think now. I will try to collect my data
and post it at one time in the near future.

I also have been trying to figure a good way to have both filters
installed. The way to do it is to remove the ceramic filter and
replace it with the mechanical SSB filter (some impedance matching
likely required). The ceramic filter is small by comparison. If you
are willing to remove the speaker (I'm not), then there is adequate
space. I have my eye on the space for the TCXO. It will be a few
weeks before I have time to really consider making this mod. If I
can, then Menu #38 would be set to CW and the new SSB filter will be
active as was the ceramic filter. NAR will flip the CW filter in and
out. Best arrangement of all!

72 de Barry - W4WB
Gary Mitchelson
 

I assume that with the opt SSB filter that it is used in the TX chain also??

-----Original Message-----
From: w4wb@... [mailto:w4wb@...]
Sent: Monday, June 04, 2001 9:43 PM
To: FT817@...
Subject: [FT817] Re: SSB Filter Selection - Performance



Sounds like you are the first one to really say the SSB filter is
worth anything. Maybe all of us ASSUMED since the specs were so close
that the reality would be ho-hum

You know, it seems so open inside the rig in that area ( from memory
)...do you think it would be possible to cram 2 in and somehow switch
them?

I imagine you may have one-of-each in your 2 FT-817s?

Thanks

Pres Waterman W2PW
Well, one will remain filterless for the time being and the other gets
filter swaps when needed.

Yes, the "gross" specs lead us all to think that the filters were very
much the same, but not so I think now. I will try to collect my data
and post it at one time in the near future.


Your use of Yahoo! Groups is subject to

 

--- In FT817@y..., "Gary Mitchelson" <n3jpu@e...> wrote:
I assume that with the opt SSB filter that it is used in the TX
chain also??
That is correct Gary. Its flat response makes it also nice for PSK31
operation.

72 de Barry - W4WB

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