Topband: Passive Receive Antenna Splitter

2014-03-13 Thread Gary K9GS
Can anyone point me to a design for a splitter for sharing a Beverage antenna between two receivers? This is for Field Day so these are not optimized Beverages by any means. Just want to allow the 80/40M stations to share antennas. Nothing fancy. My thoughts are to just use a CATV 2-Way

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread K4RO Kirk Pickering
I've used a video selector box (for 75 ohm RF, with F connectors) that Radio Shack used to sell. It was a 4-in 2-out matrix, and allowed either of two radios to have any of the 4 available antennas. It also allowed two radios to share an antenna simultaneously. I doubt R/S still sells it, but

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread Charlie Cunningham
That should work fine, Gary! You would have around 3 dB loss in a two-way splitter + a SMALL amount of mismatch-loss for the 50-75 ohm mismatch. I would expect that if your radio will work with the beverage signal, you won't likely need the preamp to make up for tha very modest loss from the

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread Charlie Cunningham
One word of caution, Gary, if the CATV splitter is a transformer type, rather than resistive it may of have enough low-frequency response for 160 m! Check around with RS and your local electronics stores for 50 ohm 2-way splitters. Those are generally resistive and have frequency response from DC

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread Joe Subich, W4TV
I use a couple of old CATV splitters for general purposes around here and can't measure any excess (more than 3 - 4 dB) loss from common to either port. If you want a known good design to build some of your own, try: http://cliftonlaboratories.com/z10050a_3_db_hybrid.htm 73, ... Joe,

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread n0tt1
You might find this of interest, the magic-t combiner/splitter: http://www.w8ji.com/combiner_and_splitters.htm 73, Charlie, N0TT On Thu, 13 Mar 2014 20:13:44 -0500 Gary K9GS garyk...@wi.rr.com writes: Can anyone point me to a design for a splitter for sharing a Beverage antenna between two

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread donovanf
Hi Gary, The most efficient way to share a Beverage among two (or as many as four) bands to use W3LPL bandpass filters. Loss of each filter is in the order of 1.5 dB vs. about 3.5 dB for a typical Magic-T combiner/splitter. http://www.k1ttt.net/technote/w3lplfil.html Just connect the

Re: Topband: Passive Receive Antenna Splitter

2014-03-13 Thread Tony Magon
Hi This may be of interest http://www.dxing.info/equipment/rolling_your_own_bryant.dx 73 Tony VK2IC On Fri, Mar 14, 2014 at 12:13 PM, Gary K9GS garyk...@wi.rr.com wrote: Can anyone point me to a design for a splitter for sharing a Beverage antenna between two receivers? This is for Field