Re: [Repeater-Builder] Dual Receive Antennas
Put the yagi at the critical station location :-) Regards Gareth Bennett
[Repeater-Builder] Dual Receive Antennas
OK, I can't get this straight as to how to do it... one repeater, with duplexer, an omni antenna for TX and RX, and a yagi added for RX in one direction to pull in a critical station. What is the best cheapest way? de NA4IT
RE: [Repeater-Builder] Dual Receive Antennas
You can't get there from here. Trying to add the yagi to the omni using power division topside isn't going to yield easily-predictable results. You'll have all kinds of pattern interaction between the two, with new nulls falling in quasi-random areas lacking sophisticated modeling. Your best bet is to feed the yagi with an independent feedline and bring it into a dedicated receiver. Vote the two receivers, or use different PL tones (PL steering). Depending on where the yagi is mounted on the tower and its proximity to the duplexed (transmitting) antenna, you may need additional filtering on that line as well. How much more gain toward the critical station do you need over what you have now? Chances are you're only going to pick up a couple of dB's by using a yagi as compared to your existing omni assuming it's a decent antenna to start with. A 7-element yagi has somewhere around 10 dBd gain, which is probably only 4 dB or so over a good VHF omni or on par with a high-gain UHF omni (you didn't mention what band we're talking about). --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Scott Sent: Wednesday, June 24, 2009 2:08 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Dual Receive Antennas OK, I can't get this straight as to how to do it... one repeater, with duplexer, an omni antenna for TX and RX, and a yagi added for RX in one direction to pull in a critical station. What is the best cheapest way? de NA4IT No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.85/2193 - Release Date: 06/24/09 06:23:00
Re: [Repeater-Builder] Dual Receive Antennas
The cheapest, most effective way is to add a PA to the single user having trouble. Chuck - Original Message - From: Scott na...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 24, 2009 2:07 PM Subject: [Repeater-Builder] Dual Receive Antennas OK, I can't get this straight as to how to do it... one repeater, with duplexer, an omni antenna for TX and RX, and a yagi added for RX in one direction to pull in a critical station. What is the best cheapest way? de NA4IT
Re: [Repeater-Builder] Dual Receive Antennas
A Pa or a better ant. at the remote station ... On Wed, Jun 24, 2009 at 3:42 PM, Chuck Kelseywb2...@roadrunner.com wrote: The cheapest, most effective way is to add a PA to the single user having trouble. Chuck - Original Message - From: Scott na...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 24, 2009 2:07 PM Subject: [Repeater-Builder] Dual Receive Antennas OK, I can't get this straight as to how to do it... one repeater, with duplexer, an omni antenna for TX and RX, and a yagi added for RX in one direction to pull in a critical station. What is the best cheapest way? de NA4IT
Re: [Repeater-Builder] Dual Receive Antennas
- Original Message - From: Jeff DePolo j...@broadsci.com To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 24, 2009 12:20 PM Subject: RE: [Repeater-Builder] Dual Receive Antennas You can't get there from here. Trying to add the yagi to the omni using power division topside isn't going to yield easily-predictable results. You'll have all kinds of pattern interaction between the two, with new nulls falling in quasi-random areas lacking sophisticated modeling. Your best bet is to feed the yagi with an independent feedline and bring it into a dedicated receiver. Vote the two receivers, or use different PL tones (PL steering). Depending on where the yagi is mounted on the tower and its proximity to the duplexed (transmitting) antenna, you may need additional filtering on that line as well. How much more gain toward the critical station do you need over what you have now? Chances are you're only going to pick up a couple of dB's by using a yagi as compared to your existing omni assuming it's a decent antenna to start with. A 7-element yagi has somewhere around 10 dBd gain, which is probably only 4 dB or so over a good VHF omni or on par with a high-gain UHF omni (you didn't mention what band we're talking about). --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Scott Sent: Wednesday, June 24, 2009 2:08 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Dual Receive Antennas OK, I can't get this straight as to how to do it... one repeater, with duplexer, an omni antenna for TX and RX, and a yagi added for RX in one direction to pull in a critical station. What is the best cheapest way? de NA4IT No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.85/2193 - Release Date: 06/24/09 06:23:00 Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.12.90/2200 - Release Date: 06/24/09 12:49:00
