Is there a way to implement the MAX4581 IC to use as the filter? Around $2 plus some passive components.
Joe N1KHB?
On Sun, Jun 16, 2024 at 12:34 PM, Gigu chan <rudebwai@...> wrote: ? What’s the price difference? ? Gig? N2GIG > On Jun 16, 2024, at 12:30, Pat Campbell < Wa3uoe@...> wrote: > > The Murata filters are similar to the internal filter in the radio. Probably a little tighter bandwidth but not near as good as the Collins mechanical filters. I'm not sure what the filter number is fr the internal filter but you could compare the specs for the internal Murata filter to the specs for the plug in Murata filters offered on Ebay and other sites. If I get a little time I will open my 817 and get the filter model? number so I can compare. > > Pat, WA3UOE > > On 6/16/2024 11:23 AM, Kevin - K5KTM via groups.io wrote: >> Understood but do they work well enough to make a difference?? I’m working on a budget and people are asking insane money for the Collins filters, be they OEM or Inrad. >> >> Thanks >> Kevin Mullens >> K5KTM >> >> >> >> >> > > > > >
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OK. The internal Murata filter is CFJ455K-14 (6 Db bandwidth of +- 1.1 - +- 1.3? kHz). The boards available for around $100.00 are CFJ455K-13. I cant find a data sheet on the -13 filter but descriptions from people selling the call them a 2.7 K bandwidth filter. If that is the case then they are a little wider than the internal filter so the audio may sound a little more natural? but a close in signal would cause more interference. I don't have one so I can't give a real world evaluation but I don't think I would spend $100.00 just to find out it's not any better than the built in filter.
Pat, WA3UOE
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On 6/16/2024 12:30 PM, Pat Campbell via groups.io wrote: The Murata filters are similar to the internal filter in the radio. Probably a little tighter bandwidth but not near as good as the Collins mechanical filters. I'm not sure what the filter number is fr the internal filter but you could compare the specs for the internal Murata filter to the specs for the plug in Murata filters offered on Ebay and other sites. If I get a little time I will open my 817 and get the filter model? number so I can compare.
Pat, WA3UOE
On 6/16/2024 11:23 AM, Kevin - K5KTM via groups.io wrote:
Understood but do they work well enough to make a difference?? I’m working on a budget and people are asking insane money for the Collins filters, be they OEM or Inrad.
Thanks
Kevin Mullens
K5KTM
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What's insane money?? Collins? is supposed to be good stuff..
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What’s the price difference?
Gig N2GIG
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On Jun 16, 2024, at 12:30, Pat Campbell <Wa3uoe@...> wrote:
The Murata filters are similar to the internal filter in the radio. Probably a little tighter bandwidth but not near as good as the Collins mechanical filters. I'm not sure what the filter number is fr the internal filter but you could compare the specs for the internal Murata filter to the specs for the plug in Murata filters offered on Ebay and other sites. If I get a little time I will open my 817 and get the filter model number so I can compare.
Pat, WA3UOE
On 6/16/2024 11:23 AM, Kevin - K5KTM via groups.io wrote:
Understood but do they work well enough to make a difference? I’m working on a budget and people are asking insane money for the Collins filters, be they OEM or Inrad.
Thanks
Kevin Mullens
K5KTM
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The Murata filters are similar to the internal filter in the radio. Probably a little tighter bandwidth but not near as good as the Collins mechanical filters. I'm not sure what the filter number is fr the internal filter but you could compare the specs for the internal Murata filter to the specs for the plug in Murata filters offered on Ebay and other sites. If I get a little time I will open my 817 and get the filter model? number so I can compare.
Pat, WA3UOE
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On 6/16/2024 11:23 AM, Kevin - K5KTM via groups.io wrote: Understood but do they work well enough to make a difference? I’m working on a budget and people are asking insane money for the Collins filters, be they OEM or Inrad.
Thanks
Kevin Mullens
K5KTM
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Understood but do they work well enough to make a difference? I’m working on a budget and people are asking insane money for the Collins filters, be they OEM or Inrad.
Thanks
Kevin Mullens
K5KTM
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Those Murata filters are ceramic. Quite different from the Collins mechanicals.
Borja - EA2EKH
Fat fingers and tiny keys?
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On 16 Jun 2024, at 16:17, Kevin - K5KTM <Ktmullens@...> wrote:
?Hi all. Has anyone tried the Chinese filters available on eBay for around $100?
If so do they work or should I just set fire to a $100 bill?
73
Kevin
K5KTM
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Hi all. Has anyone tried the Chinese filters available on eBay for around $100?
If so do they work or should I just set fire to a $100 bill?
73
Kevin
K5KTM
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Re: How to assemble an Collins filter + Board for FT-817/857 and save $$$!!!
Am glad now when I bought my FT-817 years ago. I had it sent to an outfit the name of which slips my mind but is no longer in existence and they put a CW board in and
a narrow band filter for SSB and retuned the rig.? That service almost cost as much at the radio. The SSB filter really makes a big difference.? I can switch it in or out as needed.? I sometimes run it? with a 100 watt amp and an external antenna.? RM Italy was a place where I bought an amp from that's likely not there anymore and I bought a? 100 watt amp from an old fellow at the time who is probably dead now who made up kits but had an assembled working amp I could buy.? Didn't have any trouble
running the FT-817 through an amp and appropriate antenna and tuner.? Got an FT-857 later and dropped a narrow band board in when I didn't want to diddle with
amp wiring in the 817.
Kurt KC9LDH
On Saturday, June 15, 2024 at 06:51:51 PM CDT, W6ZZ via groups.io <w6zz@...> wrote:
[Edited Message Follows]
You can buy a genuine Collins 500hz CW filter for about $103 (from various Japanese dealers) and solder it yourself to an FT-817 compatible board made by Artur, SP6AB. He sells them as a service to fellow hams for $16.? Contact Artur to confirm pricing and availability:?sp6ab@....?
I did this and I'm a Happy Camper!
73,
Howard, W6ZZ
Here's one possibility to buy a genuine Collins filter (w/o board):
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Re: How to assemble an Collins filter + Board for FT-817/857 and save $$$!!!
Yes, you will need to search and evaluate the vendors for the "Collins filter w/o board." I got mine on eBay from Japan for $103 but he no longer has availability. I can't vouch for this UK dealer and his price does appear to be "too good to be true." I provide the correct part number for the "Collins 500hz CW filter w/o board" so you can search for it. Good Luck!
73,
Howard, W6ZZ
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? get the same, tried for over 3 weeks to join, even had a member post on there for me with no results, my e-mail and call sign are the same on groups.io as it is on qrz, no problem with other groups.io im a member of, gave up in the end, not worth the bother, can see why there is a low member count for such a popular radio, not many posts as far as i can tell on that site either, sent e-mails to mod and owner with no replys, if thats how they act then sod em,?
Mick SA4MDN
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Re: How to assemble an Collins filter + Board for FT-817/857 and save $$$!!!
On Sun, Jun 16, 2024 at 12:45 AM, W6ZZ wrote:
You can buy a genuine Collins 500hz CW filter for about $103 (from Japan, UK etc.) and solder it yourself to an FT-817 compatible board made by Artur, SP6AB. He sells them as a service to fellow hams for $16. Contact Artur to confirm pricing and availability:?sp6ab@....?
73,
Howard, W6ZZ
Here's one possibility to buy a genuine Collins filter (w/o board):
AOR MF-500 500Hz MF Series Collins Mechanical Filter 526-8693-010 radio
$111.67$67.00
12?IN STOCK
I looked on Google Street View and (with apologies to the seller) that really does look a little suspect to me, especially given the price and quantity left in stock. Due dilligence may reward either way. ? -- Steve, G4VRR.
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Why bother with a group that has such ridiculous sign-up rules? It's a fair indication of the mindset of the group admins ?
I use my normal email address for groups.io but have a different one listed on qrz.com. I certainly wouldn't jump through the hoops they're suggesting. The FT5D Facebook group is reasonably sensible and has some good info.?
Cheers,?
Ronan
MM0IVR?
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How to assemble an Collins filter + Board for FT-817/857 and save $$$!!!
You can buy a genuine Collins 500hz CW filter for about $103 (from Japan, UK etc.) and solder it yourself to an FT-817 compatible board made by Artur, SP6AB. He sells them as a service to fellow hams for $16. Contact Artur to confirm pricing and availability:?sp6ab@....?
73,
Howard, W6ZZ
Here's one possibility to buy a genuine Collins filter (w/o board):
AOR MF-500 500Hz MF Series Collins Mechanical Filter 526-8693-010 radio
$111.67$67.00
12?IN STOCK
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Is the filter sold? ?If not how much including shipping to Canada.
73, Bernie
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Hello, ? I am aware that this group has nothing to do with /g/ft5dr but I keep getting rejected because my call sign and email address does match QRZ and that is false.
? ?I have sent a message but no feedback.
Anyone have a contact for that group?
regards
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HI Jean
I have located a Collins XF-115C safely stored in my shack, if you are?interested?
73 DE G0GTO
Hello,
? is there still a chance to get a filter for the Yeasu 817nd?
? I saw some on EBay, but the asking price is a lot.? I saw some compatible filters that could be used with a custom filter board.
regards,
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On Wed, Jun 12, 2024 at 06:08 PM, T S wrote:
Here is a filter which outperforms the Yaesu CW narrow filter f
It really doesn't.... It operates in the audio path. I have one in my 817 and it's nowhere near as effective as a proper if filter. It also creates spurious images of strong stations. It's only marginally better than having no filter at all.
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The sotabeams is an audio filter. You can do that with box on the headphone cable, or possibly a phone app, Or your laptop, Not the kind of thing at all as an IF filter.
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Kevin - K5KTM
Borja Marcos
W6ZZ
Michael Newbury SA4MDN
Steve
Ham Radio
on3plz
Phil
Mike EI9FEB