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Tom Holden wrote:
Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom You can probably find a surplus collins filter on ebay for about half (or less) the cost of a new one. Fair Radio used to have 2.0 and 4.0 khz filters from the famous R390 receivers at about $25 or so. |
Hi Tom,
Murata did get out of the high performance filter business..................about the only things that they have now are the 4-element CFU series, and the 6-element CFWS (now CFLW) series. Pete "Tom Holden" wrote in message ... Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom |
Hi Tom,
Murata did get out of the high performance filter business..................about the only things that they have now are the 4-element CFU series, and the 6-element CFWS (now CFLW) series. Pete "Tom Holden" wrote in message ... Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom |
You can still find the surplus filters, but the nice thing about the
526-8695 series is that they have an input/output Z of 2K, so you can substitute these filters for the ceramic filters. Another good thing is that these new Torsional Mode filters don't require any tuning caps at the I/O pins. Pete "Ken Scharf" wrote in message ... Tom Holden wrote: Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom You can probably find a surplus collins filter on ebay for about half (or less) the cost of a new one. Fair Radio used to have 2.0 and 4.0 khz filters from the famous R390 receivers at about $25 or so. |
You can still find the surplus filters, but the nice thing about the
526-8695 series is that they have an input/output Z of 2K, so you can substitute these filters for the ceramic filters. Another good thing is that these new Torsional Mode filters don't require any tuning caps at the I/O pins. Pete "Ken Scharf" wrote in message ... Tom Holden wrote: Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom You can probably find a surplus collins filter on ebay for about half (or less) the cost of a new one. Fair Radio used to have 2.0 and 4.0 khz filters from the famous R390 receivers at about $25 or so. |
On Sun, 8 Feb 2004 15:04:12 -0500, "Tom Holden"
wrote: Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom Tom, Look at the kiwa filters. They are pretty nice. http://www.kiwa.com/kiwa455.html 73 Gary K4FMX |
On Sun, 8 Feb 2004 15:04:12 -0500, "Tom Holden"
wrote: Fred McKenzie wrote: Pete, that's about as much as I paid for the receiver I'm trying to improve! A Radio Shack DX-394 Tom- I missed your original posting. What does the DX-394 currently use as an IF filter? If it happens to be made by Murata (or maybe Panasonic), a replacement with better specifications may available to fit in the same PCB holes. Check your filter's part number with the company's web site, and you may find a solution there. However, if it uses the same filter for AM reception, a tighter filter could reduce sound quality of music. 73, Fred, K4DII Fred, thanks for your follow-up. The DX-394 has two 5-element Murata ceramic filters, one 9kHz or wider for AM and one 6 kHz or wider for SSB/CW with a BFO offset of +/-3.5kHz from 455kHz. That's why a narrower filter will need a BFO mod. There does not appear to be a much narrower filter in the same package and from what I understand Murata is out of the ceramic filter business. So I guess I will have to keep an eye out for a surplus filter or shell out $85 or so for a new 'economical' Collins! Tom Tom, Look at the kiwa filters. They are pretty nice. http://www.kiwa.com/kiwa455.html 73 Gary K4FMX |
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