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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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4th Jun 2020, 4:01 pm | #1 |
Triode
Join Date: Dec 2017
Location: East Prawle, Devon, UK.
Posts: 37
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Looking for 8 pole Xtal filter type 10M22D
Hi All
Scouted internet for a crystal filter its made by Nikko Denshi type 10M22D It is an 8 pole xtal filter from the 80's and 90's but cannot find any info let alone buy one. Does anybody either have a spec sheet or one i could purchase. I believe that it was a 2.2khz bandwith SSB filter Any info or offer of one greatly appreciated Andy G0JIA
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Thanks for All 73's Andy G0JIA |
4th Jun 2020, 4:07 pm | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,902
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Re: Looking for 8 pole Xtal filter type 10M22D
You might get data out of a CirKit catalogue of the era
10.7MHz centre, I think? But you'll need to find data to know what impedances to embed it in. I have in the past, for the G-QRP club measured a number of dataless filters and played around with matching Z to get their shapes right. So they can be reverse engineered. Alternatively circuits can be changed to suit other filters. Don't think I have many filters on 10.7, (my big stocks are commercial grade 1.4MHz in USB, LSB, RTTY and CW bandwidths. I keep intending building a monument of a receiver.) but you can find 9MHz-ish ones as spares and accessories for the usual three japanese transceiver brands. David
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4th Jun 2020, 5:02 pm | #3 |
Hexode
Join Date: Mar 2009
Location: Minneapolis, Minnesota, USA.
Posts: 279
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Re: Looking for 8 pole Xtal filter type 10M22D
David is right.
You can find data on this filter on page 15 of part 4 of the Ambit International catalogue from around 1981. You can find this at https://worldradiohistory.com/UK_Miscellaneous.htm The filter has a centre frequency of 10.7 MHz (not 10.695 MHz which was sometimes used) and requires a matching impedance of 500 ohms in parallel with 18pF A Google search and your QRZ page suggests that you want this for a project Omega transceiver. If you cannot find one, there are a couple of options at the well-known auction site. One is a ladder filter (would it fit ?), or you might find a crystal filter. I am a bit wary of international postage at the moment. 73 John Last edited by John KC0G; 4th Jun 2020 at 5:07 pm. Reason: typo |
4th Jun 2020, 5:44 pm | #4 |
Triode
Join Date: Dec 2017
Location: East Prawle, Devon, UK.
Posts: 37
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Re: Looking for 8 pole Xtal filter type 10M22D
Yes building an Omegas, Built this originally in 1983 and ex wide destroyed it!!!!!! enough said.
Recently acquired a series of faulty boards that i have repaired but the CIFPU board is missing the filter, Would prefer to find the original part John, It is 10.7 meg and has a bandwidth of 2.2 for ssb and cw, apart from that cannot find any for sale even on usual sites, Ebay, Alibaba etc
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Thanks for All 73's Andy G0JIA |