power pass splitter
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From: Adam Chapman on 18 Apr 2008 05:58 Hello, I'm looking at splitters to use on my small aircraft which has two antennas broadcasting video data. I'm new to RF stuff, could somebody please tell me what 'power pass' means and what it causes to happen? I'm looking at splitters similar to the first two at http://www.rgsplit.com/servlet/the-Splitters-cln-Power-Pass/Categories, but if anybody knows of a lightweight option that would be great. Regards, Adam
From: Pen on 18 Apr 2008 11:37 Adam Chapman wrote: > Hello, > > I'm looking at splitters to use on my small aircraft which has two > antennas broadcasting video data. > > I'm new to RF stuff, could somebody please tell me what 'power pass' > means and what it causes to happen? > > I'm looking at splitters similar to the first two at > http://www.rgsplit.com/servlet/the-Splitters-cln-Power-Pass/Categories, > but if anybody knows of a lightweight option that would be great. > > Regards, > Adam What you're looking at are splitters meant for cable TV reception. Power Pass I believe means the devices will pass DC power to down/up stream devices. I would think, unless you're dealing with extremely low powered transmitters that something like these would be more appropriate. http://www.instockwireless.com/power_divider_2way.htm
From: LR on 18 Apr 2008 12:40 Adam Chapman wrote: > Hello, > > I'm looking at splitters to use on my small aircraft which has two > antennas broadcasting video data. > > I'm new to RF stuff, could somebody please tell me what 'power pass' > means and what it causes to happen? > > I'm looking at splitters similar to the first two at > http://www.rgsplit.com/servlet/the-Splitters-cln-Power-Pass/Categories, > but if anybody knows of a lightweight option that would be great. > > Regards, > Adam Most of the small quality dividers are not cheap. http://www.ssejim.co.uk/rfpowerdividers-2a.htm The ZAPD-4 sma that is listed may be worth a look. Weighs 170 gms Data Sheet:- www.minicircuits.com/pdfs/ZAPD-4+.pdf
From: Jeff Liebermann on 18 Apr 2008 14:52 On Fri, 18 Apr 2008 02:58:13 -0700 (PDT), Adam Chapman <adam.chapman(a)student.manchester.ac.uk> wrote: >I'm looking at splitters to use on my small aircraft which has two >antennas broadcasting video data. At what frequency? You can get power dividers that are fairly narrow band and are optimized for a range of frequencies, or you can get broadband devices that cover a large range of frequencies. Also, what power level are you transmitting? Power dividers have some loss and will smoke if over driven. Also, does it have to be TSO approved? Is your "small aircraft" aluminum body or fiberglass? If fiberglass, you install the antennas inside. However, that means that the two antennas will "see" each other, which means your antenna pattern will probably be full of nulls and peaks. Power splitting between dual antennas really only works if the antennas are on opposite sides of a a shielded (aluminum) body, and cannot "see" each other. >I'm new to RF stuff, could somebody please tell me what 'power pass' >means and what it causes to happen? Power pass means that it will pass DC power. That's usually in reference to running satellite dish LMB front ends, or tower mounted antenna amplifiers for over the air TV. It's also necessary for tower mounted bi-directional amplifiers, sometimes used for Wi-Fi. Unless you have some electronics mounted in the antenna, I don't think this is a requirement for your unspecified hardware. >I'm looking at splitters similar to the first two at >http://www.rgsplit.com/servlet/the-Splitters-cln-Power-Pass/Categories, >but if anybody knows of a lightweight option that would be great. I'm goint to *ASSUME* that you're only interested in 2.4GHz. See: <http://www.hyperlinktech.com/web/signal_splitters_2400_2way.php> You can also make your own: <http://www.qsl.net/yu1aw/2G4spliter2.gif> <http://www.qsl.net/yu1aw/2G4spliterN.gif> It's fairly simple. Again, this is for 2.4GHz only, not a wide range of frequencies. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: Adam Chapman on 19 Apr 2008 15:10 On Apr 18, 7:52 pm, Jeff Liebermann <je...(a)cruzio.com> wrote: > On Fri, 18 Apr 2008 02:58:13 -0700 (PDT), Adam Chapman > > <adam.chap...(a)student.manchester.ac.uk> wrote: > >I'm looking at splitters to use on my small aircraft which has two > >antennas broadcasting video data. > > At what frequency? You can get power dividers that are fairly narrow > band and are optimized for a range of frequencies, or you can get > broadband devices that cover a large range of frequencies. Also, what > power level are you transmitting? Power dividers have some loss and > will smoke if over driven. Also, does it have to be TSO approved? > > Is your "small aircraft" aluminum body or fiberglass? If fiberglass, > you install the antennas inside. However, that means that the two > antennas will "see" each other, which means your antenna pattern will > probably be full of nulls and peaks. Power splitting between dual > antennas really only works if the antennas are on opposite sides of a > a shielded (aluminum) body, and cannot "see" each other. > > >I'm new to RF stuff, could somebody please tell me what 'power pass' > >means and what it causes to happen? > > Power pass means that it will pass DC power. That's usually in > reference to running satellite dish LMB front ends, or tower mounted > antenna amplifiers for over the air TV. It's also necessary for tower > mounted bi-directional amplifiers, sometimes used for Wi-Fi. Unless > you have some electronics mounted in the antenna, I don't think this > is a requirement for your unspecified hardware. > > >I'm looking at splitters similar to the first two at > >http://www.rgsplit.com/servlet/the-Splitters-cln-Power-Pass/Categories, > >but if anybody knows of a lightweight option that would be great. > > I'm goint to *ASSUME* that you're only interested in 2.4GHz. See: > <http://www.hyperlinktech.com/web/signal_splitters_2400_2way.php> > > You can also make your own: > <http://www.qsl.net/yu1aw/2G4spliter2.gif> > <http://www.qsl.net/yu1aw/2G4spliterN.gif> > It's fairly simple. Again, this is for 2.4GHz only, not a wide range > of frequencies. > > -- > Jeff Liebermann je...(a)cruzio.com > 150 Felker St #D http://www.LearnByDestroying.com > Santa Cruz CA 95060http://802.11junk.com > Skype: JeffLiebermann AE6KS 831-336-2558 Thanks for your responses. I am going to put 2 cisco 6dB patch antennas (http://www.cisco.com/en/ US/docs/wireless/antenna/installation/guide/ant2460.html) back to back, and would like to stop them 'seeing' each other by using some RF absorbing material at http://www.kemtron.co.uk/arc.html, which I havent looked at in depth yet but expect to be lighter then aluminium. The aircraft will be made of fibreglass so the shielding is needed. I'm using a wifi network so the frequency is 2.4 gigs. I dontthink the power-pass is a requirenment, although power-pass splitters seem to be lighter and cheaper. Would using a power pass enabled splitter actually cause any problems? I also need an amplifier in my system and this one (http://www.rf- links.com/AMP8_24.pdf) looks nice and small, although I dont know if it amplifies both ways, i.e. ampllifies a trnamitted signal AND a recieved signal. Can any of you guys tell by looking at it? Your help is much appreciated Adam
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