|
rf bandpass filters 2.4GHz
Hi all,
I am transmitting in channel 3 of 802.11b, centered at 2.422Ghz. Details aside, let me just say that it is very important for my application that I sharpen up the spectral mask beyond that of the 802.11b standard. To be specific I need to purchase a bandpass filter such that I get attenation of greater than 60dB at +- 15Mhz from the center, i..e outside of [2.407Ghz, 2.437Ghz]. I am looking for suggestions on where to purchase such filter(s) with the usual parameters in mind, cost, lead time, etc. I did see the filters that hyperlink sells, but it would take many of their 8 pole filters in series to get what I need and they additionally don't sell filters for one of the channels i would need. Maybe I need to go custom on this? Any suggestions are greatly appreciated. Thanks, Kevin |
rf bandpass filters 2.4GHz
You don't need to go custom. You need to understand the impossibility of
what you are asking for. Jim wrote in message oups.com... Hi all, Maybe I need to go custom on this? Any suggestions are greatly appreciated. Thanks, Kevin |
rf bandpass filters 2.4GHz
Sorry I mispoke earlier. Let me restate this. Hyperlink has an 8pole
filter for several of the 802.11b channels that has the mask -3db at +- 10Mhz, -5db at +-15Mhz, -20dB +- 20Mhz. Essentially I want to keep 2.417 to 2.437 Ghz, so one of their filters centered at 802.11b, channel 4 would be ideal, except that they only sell centered at the standard channels (channel 3 and 6 are the closest), so in short I was wondering if anyone knows of a vendor that sells such a filter centered at 2.427Ghz. Thanks for any suggestions. RST Engineering (jw) wrote: You don't need to go custom. You need to understand the impossibility of what you are asking for. Jim wrote in message oups.com... Hi all, Maybe I need to go custom on this? Any suggestions are greatly appreciated. Thanks, Kevin |
rf bandpass filters 2.4GHz
Hello Kevin,
Sorry I mispoke earlier. Let me restate this. Hyperlink has an 8pole filter for several of the 802.11b channels that has the mask -3db at +- 10Mhz, -5db at +-15Mhz, -20dB +- 20Mhz. Essentially I want to keep 2.417 to 2.437 Ghz, so one of their filters centered at 802.11b, channel 4 would be ideal, except that they only sell centered at the standard channels (channel 3 and 6 are the closest), so in short I was wondering if anyone knows of a vendor that sells such a filter centered at 2.427Ghz. Thanks for any suggestions. That looks like you'd have to call them for a custom version which will probably be lots of $$. Or roll your own which requires a lot of RF/microwave knowledge. Or hire a consultant :-) Problem is, if you are most likely the only one needing this there won't be an existing market and chances that any other company has the right product could be close to zilch. -- Regards, Joerg http://www.analogconsultants.com |
rf bandpass filters 2.4GHz
wrote in message oups.com... Sorry I mispoke earlier. Let me restate this. Hyperlink has an 8pole filter for several of the 802.11b channels that has the mask -3db at +- 10Mhz, -5db at +-15Mhz, -20dB +- 20Mhz. Essentially I want to keep 2.417 to 2.437 Ghz, so one of their filters centered at 802.11b, channel 4 would be ideal, except that they only sell centered at the standard channels (channel 3 and 6 are the closest), so in short I was wondering if anyone knows of a vendor that sells such a filter centered at 2.427Ghz. Thanks for any suggestions. Can't you do this at IF? Tam |
rf bandpass filters 2.4GHz
Tam/WB2TT wrote:
wrote in message oups.com... Sorry I mispoke earlier. Let me restate this. Hyperlink has an 8pole filter for several of the 802.11b channels that has the mask -3db at +- 10Mhz, -5db at +-15Mhz, -20dB +- 20Mhz. Essentially I want to keep 2.417 to 2.437 Ghz, so one of their filters centered at 802.11b, channel 4 would be ideal, except that they only sell centered at the standard channels (channel 3 and 6 are the closest), so in short I was wondering if anyone knows of a vendor that sells such a filter centered at 2.427Ghz. Thanks for any suggestions. Can't you do this at IF? Tam He might with a hi Q cavity. -- Baron: |
rf bandpass filters 2.4GHz
wrote in message oups.com... Hi all, I am transmitting in channel 3 of 802.11b, centered at 2.422Ghz. Details aside, let me just say that it is very important for my application that I sharpen up the spectral mask beyond that of the 802.11b standard. To be specific I need to purchase a bandpass filter such that I get attenation of greater than 60dB at +- 15Mhz from the center, i..e outside of [2.407Ghz, 2.437Ghz]. I am looking for suggestions on where to purchase such filter(s) with the usual parameters in mind, cost, lead time, etc. I did see the filters that hyperlink sells, but it would take many of their 8 pole filters in series to get what I need and they additionally don't sell filters for one of the channels i would need. Maybe I need to go custom on this? Any suggestions are greatly appreciated. Thanks, Kevin Perhaps you could get one of the hyperlink models and modify it. |
| All times are GMT +1. The time now is 10:28 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
RadioBanter.com