Re: [Repeater-Builder] DB-304 Antenna Help
I have a DB-304DL, and that granddaddy is sweet. It is a E model and works great. Check the photo section here www.w5kgt.com Kevin Thomas W5KGT w9mwq wrote: I have DB-304 antenna that at 156.100 gives a 1.2 VSWR at 50 ohms, looks real good. I want to use this antenna at 146.925, shows a VSWR at 1.5:1 at 74 ohms. What could be done to get this to a 50 ohm impedance? All help would be greatly appreciated. Mathew Yahoo! Groups LinksYahoo! Groups Links* To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/* To unsubscribe from this group, send an email to:[EMAIL PROTECTED]* Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/W5KGTKevin ThomasCalhoun, La.www.w5kgt.com Do you Yahoo!?SBC Yahoo! - Internet access at a great low price. Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] DB-304 Antenna Help
Thanks Tom, will see how it works out. Mathew - Original Message - From: Tom Manning [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, May 12, 2004 2:05 PM Subject: Re: [Repeater-Builder] DB-304 Antenna Help Mathew The harness was changed because it was both bad and needed changing to accomodate the retuning. Generally the higher freq harness is not long enough to allow the dipoles to be moved to where they should be. Some people have used the harness and dipole placement as they were originally but with a slightly higher VSWR. This does not give you the best pattern either. 73's de Tom Manning, AAF4UG Mathew Quaife wrote: Mathew I am not familiar with that particular model antenna. I currently use a DB224 antenna that I modified about 10 years ago for use at 145.49Mhz. I figured how much to lengthen the loops by using ratio and proportion, I then cut the loops and added the necessary aluminum rod. I had the added rod and all aluminum connections heliarced. The antenna has a very low VSWR and has given many years good service. This is not bad for a recycled commercial antenna that cost nothing but a $200 Was the harness changed to accomodate the antenna retunning, or to replace a bad one.? Mathew phasing harness and a good deal of work. 73's de Tom Manning, AF4UG [EMAIL PROTECTED] w9mwq wrote: I have DB-304 antenna that at 156.100 gives a 1.2 VSWR at 50 ohms, looks real good. I want to use this antenna at 146.925, shows a VSWR at 1.5:1 at 74 ohms. What could be done to get this to a 50 ohm impedance? All help would be greatly appreciated. Mathew Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] DB-304 Antenna Help
Mathew I am not familiar with that particular model antenna. I currently use a DB224 antenna that I modified about 10 years ago for use at 145.49Mhz. I figured how much to lengthen the loops by using ratio and proportion, I then cut the loops and added the necessary aluminum rod. I had the added rod and all aluminum connections heliarced. The antenna has a very low VSWR and has given many years good service. This is not bad for a recycled commercial antenna that cost nothing but a $200 Was the harness changed to accomodate the antenna retunning, or to replace a bad one.? Mathew phasing harness and a good deal of work. 73's de Tom Manning, AF4UG [EMAIL PROTECTED] w9mwq wrote: I have DB-304 antenna that at 156.100 gives a 1.2 VSWR at 50 ohms, looks real good. I want to use this antenna at 146.925, shows a VSWR at 1.5:1 at 74 ohms. What could be done to get this to a 50 ohm impedance? All help would be greatly appreciated. Mathew Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] DB-304 Antenna Help
Mathew The harness was changed because it was both bad and needed changing to accomodate the retuning. Generally the higher freq harness is not long enough to allow the dipoles to be moved to where they should be. Some people have used the harness and dipole placement as they were originally but with a slightly higher VSWR. This does not give you the best pattern either. 73's de Tom Manning, AAF4UG Mathew Quaife wrote: Mathew I am not familiar with that particular model antenna. I currently use a DB224 antenna that I modified about 10 years ago for use at 145.49Mhz. I figured how much to lengthen the loops by using ratio and proportion, I then cut the loops and added the necessary aluminum rod. I had the added rod and all aluminum connections heliarced. The antenna has a very low VSWR and has given many years good service. This is not bad for a recycled commercial antenna that cost nothing but a $200 Was the harness changed to accomodate the antenna retunning, or to replace a bad one.? Mathew phasing harness and a good deal of work. 73's de Tom Manning, AF4UG [EMAIL PROTECTED] w9mwq wrote: I have DB-304 antenna that at 156.100 gives a 1.2 VSWR at 50 ohms, looks real good. I want to use this antenna at 146.925, shows a VSWR at 1.5:1 at 74 ohms. What could be done to get this to a 50 ohm impedance? All help would be greatly appreciated. Mathew Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] DB-304 Antenna Help
I have DB-304 antenna that at 156.100 gives a 1.2 VSWR at 50 ohms, looks real good. I want to use this antenna at 146.925, shows a VSWR at 1.5:1 at 74 ohms. What could be done to get this to a 50 ohm impedance? All help would be greatly appreciated. Mathew Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
