TS-450 Filter Selection ?
Ben Johnson
I have am considering buying a Kenwood TS-450. I would like to get it
with the CW filter(s) as I will be using it for some CW. My question
is... There are two 500Hz filter options availible. 1st IF and 2nd IF.
Is there an advantage to one over the other? I would greatly appreciate
any input on this subject. Thanks.
Ben Johnson
KF4JEB
tege...@hfs.purdue
Buy the 500 Hz filter for the first IF. Then later, if you want to get really
sharp filters, you can buy the 250 Hz filter for the second IF. The 250 Hz
filter is not available for the first IF.
Wolfgang Gellerich
In article <NEWTNews.14231.839887522.Postmaster@hfs08>, tege...@hfs.purdue writes:
|>
|> In article <320F88...@concentric.net>, <bj...@concentric.net> writes:
|>
|> > I have am considering buying a Kenwood TS-450. I would like to get it
|> > with the CW filter(s) as I will be using it for some CW. My question
|> > is...
|> Buy the 500 Hz filter for the first IF. Then later, if you want to get really
|> sharp filters, you can buy the 250 Hz filter for the second IF. The 250 Hz
|> filter is not available for the first IF.
|>
There's a 270Hz filter for the 8.8 Mhz IF.
73, Wolfgang DJ3TZ
adamkern
You probably would be better off going with the IF that is reached first
by the incoming signal. Eliminate the interference at the beginning to
avoid images, etc...
I think that in the 450 (I own one too) the first IF is the 8.83. I
actually have the 450 and it came with the 500 hz CW in the 455 IF.
Works fine. I'm probably going to get the 1.8 khz ssb for the 8.83, and
then maybe the 270 hz CW for the 8.83.
You should probably check on which IF is first, though. I couldn't find
it in the instruction manual, but I think that what's above is ok. Try
calling kewnwood, or mailing them over the net.
Good luck!
73,
Adam Kern
N1TYF
adam...@tiac.net
JOE REED
The 8.83 is the first IF. Filters for the 2nd IF (455) are much
more expensive. I have two 450's one with 500 CPS cw filters
for both IF's and 1.8 SSB filter and the other with the 500 CPS
filter for the 8.83 IF. My advice is to buy the 8.83 500 CPS filter
and use that for awhile. I doubt if you will wish to add any more
filters..
Joe Reed K7CJ
Tom, AE4TB
In article <320F88...@concentric.net>, From Ben Johnson
<bj...@concentric.net>, the following was written:
> I have am considering buying a Kenwood TS-450. I would like to get it
> with the CW filter(s) as I will be using it for some CW. My question
>
> Is there an advantage to one over the other? I would greatly
Ben,
As a happy TS450 owner, I might be able to help here. I used both the
8.8mhz and 455khz 500 hz filters and did not notice too much of a
difference. I eventually replaced the 455khz with the 270hz narrow CW
filter--love that one!!!! If you are serious about CW consider owning
both. If you don't need the 270hz, I'd probably put the 500hz in the
455khz IF.
My .02 worth!
73 de Tom, AE4TB
Clark Thompson
Tom, AE4TB wrote:
>
> In article <320F88...@concentric.net>, From Ben Johnson
> <bj...@concentric.net>, the following was written:
> > I have am considering buying a Kenwood TS-450. I would like to get it
> > with the CW filter(s) as I will be using it for some CW. My question
> > is... There are two 500Hz filter options availible. 1st IF and 2nd IF.
> >
> > Is there an advantage to one over the other? I would greatly
> > appreciate any input on this subject. Thanks.> .
I have a TS-850S with the 500 Hz filter in the 455kHz IF. I chose it
over the 8.83 filter because it has a much better shape factor. Both
filters have a 6 dB bandwith of 500Hz. But at 60 dB points, the 455
filter's bandwith is 820 Hz compared to the 8.83 filter's 1.5 kHz. So
the 6:60 shape factor for the 455 filter is 1.64, compared to 3.0 for the
8.83 filter. In crowded band conditions you'd appreciate the difference.
73,
de Clark, KD9QI
adamkern
If you really want the best performance, you can cascade the filters.
Install both, and then you'll end up with a slightly narrower bandwidth
than 500 hz, and it will be razor sharp. I don't know about the shape
factor of the filter, but I've read that if you have only one filter, put
it in the first IF. This helps reduce images. However, I have the 455
khz filter for 500 hz cw in my '450, and it works great. The 8.83 might
be better, but you won't be dissappointed with the 455.