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#1
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RF Filter PCBs
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites. http://www.rfbites.com |
#2
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RF Filter PCBs
In article .com,
wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California |
#3
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RF Filter PCBs
On Nov 3, 5:49 pm, Telamon
wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California So, what material do you use over 1GHz? You buget guy must really not like you. BTW, I didn't design these boards, nor to I work for these guys. I just got my board in the other day and was pumped up when I was able to build up a filter quickly. It's in my tuner right now, filtering away. My filter has good rejection (50dB) up to 3.5GHz, and it starts to fall apart. |
#4
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RF Filter PCBs
On Nov 3, 5:49 pm, Telamon
wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California Connectors are rated to 12GHz. FR-4 is good up to 3.5GHz, then it starts to fall apart. |
#5
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RF Filter PCBs
On Nov 3, 6:17 pm, wrote:
On Nov 3, 5:49 pm, Telamon wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California Connectors are rated to 12GHz. FR-4 is good up to 3.5GHz, then it starts to fall apart. Telamon, I would be glad to send you a spaned out response from the Net A. Let me know. FH |
#7
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RF Filter PCBs
In article . com,
wrote: On Nov 3, 5:49 pm, Telamon wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California Connectors are rated to 12GHz. FR-4 is good up to 3.5GHz, then it starts to fall apart. I would not use FR4 over 1GHz. -- Telamon Ventura, California |
#8
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RF Filter PCBs
On Sun, 04 Nov 2007 00:17:26 -0000, wrote:
On Nov 3, 5:49 pm, Telamon wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California Connectors are rated to 12GHz. FR-4 is good up to 3.5GHz, then it starts to fall apart. http://en.wikipedia.org/wiki/FR4 |
#9
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RF Filter PCBs
On Nov 5, 5:21 am, David wrote:
On Sun, 04 Nov 2007 00:17:26 -0000, wrote: On Nov 3, 5:49 pm, Telamon wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California Connectors are rated to 12GHz. FR-4 is good up to 3.5GHz, then it starts to fall apart. http://en.wikipedia.org/wiki/FR4- Hide quoted text - - Show quoted text - David - Good Info and Link. ~ RHF |
#10
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RF Filter PCBs
On Nov 5, 6:21 am, David wrote:
On Sun, 04 Nov 2007 00:17:26 -0000, wrote: On Nov 3, 5:49 pm, Telamon wrote: In article .com, wrote: If you need to prototype or build a lumped element RF filter, check out the RF Filter PCBs at RF Bites. http://www.rfbites.com Those are not very good coax to PCB connectors. You can do better. Must be pretty low frequency stuff ( 1 GHz ) if you are using FR4. -- Telamon Ventura, California Connectors are rated to 12GHz. FR-4 is good up to 3.5GHz, then it starts to fall apart. http://en.wikipedia.org/wiki/FR4- Hide quoted text - - Show quoted text - Hi David, Good article. I partially agree with Talamon that FR4 is not ideal over 1GHz, if you have the budget for Roger's material and the specs that necessitate such performance in your substrate. In the commercial world, you would have a hard time justifying such an expense, so most designers have to eat the performance issues and work a little harder to develop more robust designs to handle the gross tolerance swings. I would challenge anyone to find a PCS cell phone (1.9GHz) or a commercial GPS with Roger's material. When I said that the FR-4 material was good up to 3.5GHz, that means I am getting good rejection in my filters up to that frequency. I wouldn't design my passband to be anything much over 2 GHz. Isn't there a saying that goes something like, "Any average Engineer can design a $50,000 car, it takes a good Engineer to design a $15,000 car." Food for thought. FH |
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