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CW filter options
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I'm interested in getting a 500 Hz CW filter for my ft-817 ND.? I'm confused by all the options available.? Yaesu offers a YF-122C. I guess these are expensive and maybe not the best performing? Then I have a hard time sorting out the other options/terms that may or may not still be available. I'd love a combo SSB/CW, but not a big concern.? Collins W4RT Sotabeams Inrad Mechanical vs digital?? Others? Anyone with a handle on this, I would like to hear your thoughts.? Thanks! 73 KE0GNL Adam Sent from my Verizon LG Smartphone |
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For the most part the filters are all made by Collins (and are no longer in production), so all the options go back to the same basic filter.?
The various retailers mount the filter on a board suitable for your rig. For me, inrad has been a good source when I couldn't find a used filter on ebay. I dont think W4RT is still in business (correct me of I'm wrong) and they were the one who made the board that let you use 2 filters on the 817. Hope that helped. John - KE7WNB? |
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You're totally correct.? W4RT closed their doors over a year ago.? They sold off all the filter kits, then offered up the bare boards last.? I bought up a few for "FUTURE NEEDS".? AFAIKT, nothing more is available from W4RT.
I have installed the dual-filter kit in two FT-817NDs, and one ICOM IC-703+.? I luv em, and now my German nephew is begging me to a a bare board.? He did his first SOTA activation, and fell in love with the Collins SSB filter, but he also sees the need for the CW filter.? Like me, he wants both.
Vy73 -- Mike -- DL/KD5KC
Rhon Mountains
Strahlungen Germany
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There is another filter option that doesn't get mentioned often:?
?
As I understand it, this is an AF not IF filter that is extremely
effective.? Like any other internal modification to your radio, you need
to be comfortable with a fine-tip soldering iron and be willing to void
your (mostly worthless) warranty.
For those in the US, DX Engineering resells almost all of the SotaBeams products. Disclaimers:?
I have a business relationship with SotaBeams and can stand behind the
quality of their business.? I am not being compensated for this
comment.? I have not used this filter but would be seriously considering
it myself if I had a radio that needed a filter.? It might not work
with a FT-818 - I don't believe anyone has tested it yet. jon N0WL |
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Been thinking of getting the Sotabeam filt for my 817, anyone here use one ?? How well does it work ? Rick KC8AON ---In FT817@..., <jonpoland@...> wrote : There is another filter option that doesn't get mentioned often:??
As I understand it, this is an AF not IF filter that is extremely
effective.? Like any other internal modification to your radio, you need
to be comfortable with a fine-tip soldering iron and be willing to void
your (mostly worthless) warranty. For those in the US, DX Engineering resells almost all of the SotaBeams products. Disclaimers:?
I have a business relationship with SotaBeams and can stand behind the
quality of their business.? I am not being compensated for this
comment.? I have not used this filter but would be seriously considering
it myself if I had a radio that needed a filter.? It might not work
with a FT-818 - I don't believe anyone has tested it yet. jon N0WL |
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Hi all: Another option as an audio DSP unit is the Funtronics ADSP filter: It receives mixed reviews on eham.net, I have one, and must say that, on SSB, it works pretty well; on CW, it is finicky, but usable. Still no match for my TS590S, though! Stephen KI9S
On Monday, June 17, 2019, 3:30:50 PM EDT, jonpoland@... [FT817] wrote:
?
There is another filter option that doesn't get mentioned often:? ? As I understand it, this is an AF not IF filter that is extremely effective.? Like any other internal modification to your radio, you need to be comfortable with a fine-tip soldering iron and be willing to void your (mostly worthless) warranty. For those in the US, DX Engineering resells almost all of the SotaBeams products. Disclaimers:?
I have a business relationship with SotaBeams and can stand behind the
quality of their business.? I am not being compensated for this
comment.? I have not used this filter but would be seriously considering
it myself if I had a radio that needed a filter.? It might not work
with a FT-818 - I don't believe anyone has tested it yet. jon N0WL
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I have an ND with the sotabeams filter, it is installed so a Collins filter can be run parallel with it and I find it very comparable to the Collins on CW. The slopes of the filters must be similar because to my ear they have almost the same sound.
Depending on your use case it may be a good option. The Sotabeams is always in-line either using the wide or narrow setting. And since it is a dsp audio filter it is always in series with the stock ceramic filter on receive. Ultimate rejection of closed space signals probably would still be a good case for the Collins filters but for just general use I think the sotabeams is very usable. The only interest I have in any of the equipment is as an owner but I do have an 817nd on QRZ for sale with the sotabeams filter installed right now. 73 KV4TT- Mike |
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Are we talking about IF or audio filters? Are Murata filters a candidate?? It seems to me that National Semiconductor made an IC audio filter left to the user for setting characteristics with passives. Joe On Monday, June 17, 2019 rmckee1957 <FT817@...> wrote:
?
Been thinking of getting the Sotabeam filt for my 817, anyone here use one ?? How well does it work ? Rick KC8AON ---In FT817@..., wrote : There is another filter option that doesn't get mentioned often:??
As I understand it, this is an AF not IF filter that is extremely
effective.? Like any other internal modification to your radio, you need
to be comfortable with a fine-tip soldering iron and be willing to void
your (mostly worthless) warranty. For those in the US, DX Engineering resells almost all of the SotaBeams products. Disclaimers:?
I have a business relationship with SotaBeams and can stand behind the
quality of their business.? I am not being compensated for this
comment.? I have not used this filter but would be seriously considering
it myself if I had a radio that needed a filter.? It might not work
with a FT-818 - I don't believe anyone has tested it yet. jon N0WL |
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P.S. Linear Technology and Texas Instruments for audio filter ICs as well. One can also homebrew multipole as many orders as needed as Chebyshev, Butterworth, etc. with op amps. Joe On Monday, June 17, 2019 Joseph Wonoski N1KHB <FT817@...> wrote:
?
Are we talking about IF or audio filters? Are Murata filters a candidate?? It seems to me that National Semiconductor made an IC audio filter left to the user for setting characteristics with passives. Joe On Monday, June 17, 2019 rmckee1957 <FT817@...> wrote:
?
Been thinking of getting the Sotabeam filt for my 817, anyone here use one ?? How well does it work ? Rick KC8AON ---In FT817@..., wrote : There is another filter option that doesn't get mentioned often:??
As I understand it, this is an AF not IF filter that is extremely
effective.? Like any other internal modification to your radio, you need
to be comfortable with a fine-tip soldering iron and be willing to void
your (mostly worthless) warranty. For those in the US, DX Engineering resells almost all of the SotaBeams products. Disclaimers:?
I have a business relationship with SotaBeams and can stand behind the
quality of their business.? I am not being compensated for this
comment.? I have not used this filter but would be seriously considering
it myself if I had a radio that needed a filter.? It might not work
with a FT-818 - I don't believe anyone has tested it yet. jon N0WL |
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