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Prescaler? Suggestions anyone?
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a reliable source. I bought a couple, but that source dried up. All I need is a divider chip that will accept a small signal up to 150MHz, is available, cheap(ish) and will divide down to under 10MHz so that I can use CMOS to process a synthesiser. A parallel-load synthesiser chip with in-built 150MHz prescaler would do. I have used "Teleport" to download over 50,000 pdf datasheets without any luck. I have gone through most of them, but it takes a fair bit of time. If anyone has a helpful suggestion I would appreciate it. BR from Harry - SM0VPO http://w1.859.telia.com/~u85920178/ harryvpo (at) hotmail (dot) com |
Hi,
Mouser have some NEC pre-scalers (3GHz max) for $2.92 a throw. Cheers - Joe |
Hi,
Mouser have some NEC pre-scalers (3GHz max) for $2.92 a throw. Cheers - Joe |
In , "Harry \(SM0VPO\)"
wrote: Hi all, I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a reliable source. I bought a couple, but that source dried up. All I need is a divider chip that will accept a small signal up to 150MHz, is available, cheap(ish) and will divide down to under 10MHz so that I can use CMOS to process a synthesiser. A parallel-load synthesiser chip with in-built 150MHz prescaler would do. I have used "Teleport" to download over 50,000 pdf datasheets without any luck. I have gone through most of them, but it takes a fair bit of time. If anyone has a helpful suggestion I would appreciate it. BR from Harry - SM0VPO http://w1.859.telia.com/~u85920178/ harryvpo (at) hotmail (dot) com Man, if THIS ain't a trip -- a well-known, over-rated internet homebrew tech asking for help for a simple prescaler. Hey Harry, don't you know that the basic freshman-lab-grade Class B or C amplifier is nothing more than a divide-by-2 counter? If you have a bunch of 2N2222's, 2N2907's, or any transistor with an Ft above your high-freq limit, you have a divide-by-(n x 2) counter. Any advanced homebrewer should know that stuff cause it's basic theory. And for you to post such a question in alt.radio.pirate.... that's pretty pathetic, Harry. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
In , "Harry \(SM0VPO\)"
wrote: Hi all, I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a reliable source. I bought a couple, but that source dried up. All I need is a divider chip that will accept a small signal up to 150MHz, is available, cheap(ish) and will divide down to under 10MHz so that I can use CMOS to process a synthesiser. A parallel-load synthesiser chip with in-built 150MHz prescaler would do. I have used "Teleport" to download over 50,000 pdf datasheets without any luck. I have gone through most of them, but it takes a fair bit of time. If anyone has a helpful suggestion I would appreciate it. BR from Harry - SM0VPO http://w1.859.telia.com/~u85920178/ harryvpo (at) hotmail (dot) com Man, if THIS ain't a trip -- a well-known, over-rated internet homebrew tech asking for help for a simple prescaler. Hey Harry, don't you know that the basic freshman-lab-grade Class B or C amplifier is nothing more than a divide-by-2 counter? If you have a bunch of 2N2222's, 2N2907's, or any transistor with an Ft above your high-freq limit, you have a divide-by-(n x 2) counter. Any advanced homebrewer should know that stuff cause it's basic theory. And for you to post such a question in alt.radio.pirate.... that's pretty pathetic, Harry. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
"Harry \(SM0VPO\)" wrote in message . ..
Hi all, I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a reliable source. I bought a couple, but that source dried up. All I need is a divider chip that will accept a small signal up to 150MHz, is available, cheap(ish) and will divide down to under 10MHz so that I can use CMOS to process a synthesiser. A parallel-load synthesiser chip with in-built 150MHz prescaler would do. I have used "Teleport" to download over 50,000 pdf datasheets without any luck. I have gone through most of them, but it takes a fair bit of time. If anyone has a helpful suggestion I would appreciate it. BR from Harry - SM0VPO http://w1.859.telia.com/~u85920178/ harryvpo (at) hotmail (dot) com If you can live with a larger and binary division, there would be a prescaler that likely does work to that frequency limit in any digitally tuned FM broadcast radio. I have not looked up the upper frequency limit on these, but of course their needed range isn't much lower than your upper limit. I don't have a specific part number, I'm not even sure how much variety of ICs are used in these applications, but just about any scrap digitally tuned radio would offer up something. And if you need to find something commonly available but not rely on scrounging, then open one up and find the NTE replacement for the prescaler. Michael VE2BVW |
"Harry \(SM0VPO\)" wrote in message . ..
Hi all, I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a reliable source. I bought a couple, but that source dried up. All I need is a divider chip that will accept a small signal up to 150MHz, is available, cheap(ish) and will divide down to under 10MHz so that I can use CMOS to process a synthesiser. A parallel-load synthesiser chip with in-built 150MHz prescaler would do. I have used "Teleport" to download over 50,000 pdf datasheets without any luck. I have gone through most of them, but it takes a fair bit of time. If anyone has a helpful suggestion I would appreciate it. BR from Harry - SM0VPO http://w1.859.telia.com/~u85920178/ harryvpo (at) hotmail (dot) com If you can live with a larger and binary division, there would be a prescaler that likely does work to that frequency limit in any digitally tuned FM broadcast radio. I have not looked up the upper frequency limit on these, but of course their needed range isn't much lower than your upper limit. I don't have a specific part number, I'm not even sure how much variety of ICs are used in these applications, but just about any scrap digitally tuned radio would offer up something. And if you need to find something commonly available but not rely on scrounging, then open one up and find the NTE replacement for the prescaler. Michael VE2BVW |
"Harry (SM0VPO)" wrote in message ... Hi all, I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I'd be inclined to use a CPLD. The Xilinx XC9536 would be good to over 150 MHz and a suitable synchronous counter is quite trivial. 73, Leon -- Leon Heller, G1HSM http://www.geocities.com/leon_heller |
"Harry (SM0VPO)" wrote in message ... Hi all, I am having a spot of bother with prescaler chips. Basically I need to find one at the right price and availability. US$5 each is reasonable, but where from? Is there one available that is not obsolete? I live in Sweden and my local component shop is ELFA (Swedens answer to RS). They don't sell ANY digital divider that operates above 50MHz, except for the 74F163 and I cannot come up with a reliable interface circuit to couple an oscillator into it at over 100MHz. I'd be inclined to use a CPLD. The Xilinx XC9536 would be good to over 150 MHz and a suitable synchronous counter is quite trivial. 73, Leon -- Leon Heller, G1HSM http://www.geocities.com/leon_heller |
"Joe McElvenney" wrote in message ... Hi, Mouser have some NEC pre-scalers (3GHz max) for $2.92 a throw. Any idea of the NEC part number ? Thanks |
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