Re: [Repeater-Builder] TKR-820 - Adding an External Controller..
Hi Steve, hope this helps..: Pin Function 1 Hook ( must be grounded in order to PTT ) 2 Line ground 3 Encode tone input 4 Discriminator 5 Line audio ( Takeover switch must be in out position ) 6 Speaker ground 7 13.6 vdc 1.0 amps max out 8 PTT 9 Speaker in 10Rx audio squelched 11 Ground 12 Speaker out 13 TOR ( Low when proper PL decode ) 14 Special use ( for channel change ) 15 "" " Juan,73 - Mensaje original - De: Steve Grantham Para: Repeater-Builder@yahoogroups.com Enviado: Wednesday, April 14, 2004 2:20 PM Asunto: [Repeater-Builder] TKR-820 - Adding an External Controller.. Does anyone have the pin-outs for the accessory jack on the TKR-820 foradding an external controller? Any hookup tips?Thanks!Steve 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] Syntor X Control Cable
Thanks Steve, I was about to send something equivalent, i am not a pro in /"$%?*() ASCII art!!! 73 from Michel, VA2MAA ;-) - Original Message - From: Steve Grantham To: Repeater-Builder@yahoogroups.com Sent: Wednesday, April 14, 2004 12:08 PM Subject: Re: [Repeater-Builder] Syntor X Control Cable Maybe this will help! See the attached JPG file. Looks to me like the slashes and back-slashes are parts of a resistor symbol, and the greater-than signs are probably wipers on potentiometers. The attachment is a clip from a screen shot. Armed with this information, you should be able to work it out or ask the author another question. Steve, AA5SG :) - Original Message - From: "Michel-A Allard" [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, April 12, 2004 6:29 PM Subject: Re: [Repeater-Builder] Syntor X Control Cable Hello Matt Both pot are 25K, audio taper. Radio J1 pin 14 _ / \ Radio J1 pin 3 / Volume (25K) \ / 3.3K \ Radio J1 pin 2 _/\/\/\/\_/ 3.3K Radio J1 pin 2 _/\/\/\/\_ / \ Radio J1 pin 28 / Squelch (25K) \ / Radio J1 pin 14 _\ For mode select tying pin 13 and 14 on J1 will select Mode 1. Hope this help, 73 de Michel VA2MAA [EMAIL PROTECTED] - Original Message - From: "Matt Krick" [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, April 12, 2004 3:31 PM Subject: [Repeater-Builder] Syntor X Control CableDoes any one have information on the value of pots and or capacitors used on a Syntor X control head for the volume and squelch signals? Or can somebody draw a sketch of what does what? I had a manual but some one disapeared with it.Thanks --Matt 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] TKR-850 - Where to get CTCSS enable signal?
There are multiple inputs and outputs that can be programed for that purposes even there are for encode on/off ,decode on/off , you only have to look in the software.. - Mensaje original - De: Gregg Lengling Para: Repeater-Builder@yahoogroups.com Enviado: Wednesday, April 14, 2004 12:29 PM Asunto: RE: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal? You need to program one of the programmable outputs to TOR (this is a logicsignal that goes active with received signal and proper tone). 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] Re: Audio Reproduction
I think we're on two different wavelengths here. What I am talking about is practical application, not theoretical mumbo-jumbo. OK, yes, I'm talking about the theoretical limitations. Your earlier post said that even theoretical PM falls apart at low frequencies, and that's where I disagree. But compared to a volt P to P that is a small signal. We wouldn't run volts of audio down the same system, with no changes. You wouldn't put speaker level audio on a line designed for 10 uV, and expect everything to play fine. 100 dB of dynamic range is about the best we can expect out of a good CD changer. That limit is imposed by quantization noise due to the 16 bit word length for the samples; it's not an analog limitation. The theoretical limit for 16 bits is 98.08 dB. For 24 bits (common nowadays in audio work), it's 146.24 dB. Anyway, what I am talking about is real world limitations on the theoretical PM. Sure theoretically you could build a modulator that would do .01 to 3 KHz. Would it be expensive? duh. Would it be complex? duh. Considering that a PM Mastr II station originally cost more than what you can get a digital broadcast exciter for nowadays, I don't consider the cost to be the limiting factor. As far as complexity, it depends on how you define the term. To some, digital logic and DSP is less complex than analog circuit design. Let's face it, in either case you put audio and DC into the box and you get modulated RF out of it. The complexity of the circuitry that does that conversion is subjective. Think about it - in a digital implementation you don't need analog circuitry to high-pass filter, preemphasize, limit, deemphasize, low-pass filter, gain-adjust, buffer, generate PL/DPL and sum it in, modulate, multiply, key on and off, etc. - one DSP chip and maybe a few thousand lines of code would replace most of the analog circuitry in a traditional PM (or FM) exciter, and once written, it could be re-used for multiple bands in many models and generations of radios. Cost effective to manufacture? Hell yeah! I guess this begs the question - at that point, where you're doing preemphasis and modulation via math versus analog circuitry and synthesizing the modulated carrier, do you call it PM or preemphasized FM? I would argue the latter since you could have response that includes DC. --- Jeff Jeff DePolo WN3A - [EMAIL PROTECTED] Broadcast and Communications Consultant 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] Decibel repeater antenna question-unbalanced radiating loops
Hi I have been studying the db stacked array and the bayed array seems to use unbalanced dipoles as the radiators .I have tried to find a close up view of a single dipole so I can confirm my ideas. If anyone has some good tech info on these antennas I would appreciate the info. It would make sense to by-pass the need of baluns for each dipole -cost and balun loss? Regards Brad ZS5WT Repeater Owner [EMAIL PROTECTED] __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html 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] Cellular Antenna question
This is a little off topic but may benefit others. I have a week Verizon signal in my house. Not much better outside either. Can go around the block and get better signal. Just two miles from the nearest tower. Would like to put an antenna on my tower and connect it to one in the house house to use as a passive system. Any suggestions. BTW. Have contacted Verizon service about the signal. Doubt if anything will get done since carriers don't guarantee service inside buildings. -- Amateur Radio W4HNK EM92vx 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] Re: Audio Reproduction
--- Jeff DePolo WN3A [EMAIL PROTECTED] wrote: I guess this begs the question - at that point, where you're doing preemphasis and modulation via math versus analog circuitry and synthesizing the modulated carrier, do you call it PM or preemphasized FM? I would argue the latter since you could have response that includes DC. --- Jeff Jeff DePolo WN3A - [EMAIL PROTECTED] Broadcast and Communications Consultant Well thats kind of the point I'm trying to make. At some point in DSP, audio processing, synthesis, etc- all thrown into a bag and each manipulated with numbers or programming, we sort of lose base with what we are doing. We could create AM, FM, PM, SSB, PSK, FSK, what have you. This has become a problem with the FCC, and they now are proposing software defined radio as a catchphrase. That makes sense, since basically you have a mike and an ant jack, and the programming or software inside make it digital, analog, or some combination of both. Nowadays, its probably not fair to include such items, even though they are the future. Most of us in the real world can't afford them yet, and have to rely on Micors, MII, etc. AFAIK, there haven't been any commercial two-way radios built in the last 15 to 20 years that use PM. I could be wrong, but I can't think of any. Joe __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html 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] Cellular Antenna question
John Place wrote: This is a little off topic but may benefit others. I have a week Verizon signal in my house. Not much better outside either. Can go around the block and get better signal. Just two miles from the nearest tower. Would like to put an antenna on my tower and connect it to one in the house house to use as a passive system. Any suggestions. BTW. Have contacted Verizon service about the signal. Doubt if anything will get done since carriers don't guarantee service inside buildings. A passive system as you describe might work. Use a yagi outside pointed at the tower, and run it to a gain antenna omni inside. Use GOOD coax, at least 9913. STAY AWAY from those active devices!!! For starters, they are illegal unless you get permission from the carrier (not likely). Poor construction and improper installation has caused oscillation, spurs, and interference to other cell carriers, and worse, other radio services, including public safety systems on 800 MHz. -- Jim Barbour WD8CHL 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] Decibel repeater antenna question-unbalanced radiating loops
There are not any baluns on these antennas. If I remember right, they use 75 ohm coax on each bay (odd multiples of quarter wave length) and 35 ohm coax on the feed (again odd multiples) to match the impedance to 50 ohms. This info was on the group a while back, somebody must still have it. Paul, kb9wlc Mathew Quaife [EMAIL PROTECTED] wrote: Would a close up pic of a DB304 work for your needs, or I have the DB420 there as well. Mathew bradley glen [EMAIL PROTECTED] wrote: HiI have been studying the db stacked array and thebayed array seems to use unbalanced dipoles as theradiators .I have tried to find a close up view of asingle dipole so I can confirm my ideas.If anyone has some good tech info on these antennas Iwould appreciate the info.It would make sense to " by-pass " the need of balunsfor each dipole -cost and balun loss?RegardsBrad ZS5WT Repeater Owner [EMAIL PROTECTED]__Do you Yahoo!?Yahoo! Tax Center - File online by April 15thhttp://taxes.yahoo.com/filing.htmlYahoo! 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/ Do you Yahoo!?Yahoo! Tax Center - File online by April 15th Do you Yahoo!? Yahoo! Tax Center - File online by April 15th 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] Decibel repeater antenna question-unbalanced radiating loops
Would a close up pic of a DB304 work for your needs, or I have the DB420 there as well. Mathew bradley glen [EMAIL PROTECTED] wrote: HiI have been studying the db stacked array and thebayed array seems to use unbalanced dipoles as theradiators .I have tried to find a close up view of asingle dipole so I can confirm my ideas.If anyone has some good tech info on these antennas Iwould appreciate the info.It would make sense to " by-pass " the need of balunsfor each dipole -cost and balun loss?RegardsBrad ZS5WT Repeater Owner [EMAIL PROTECTED]__Do you Yahoo!?Yahoo! Tax Center - File online by April 15thhttp://taxes.yahoo.com/filing.htmlYahoo! 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/ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th 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] Decibel repeater antenna question-unbalanced radiating loops
I think you will find that the feed point is 50-Ohms whenfeeding one of these single unbalanceddipole elements.The harness is for makingthe multiple elements on the array look like one elementto thetransmission line. Look at their (DB's) folded unipole antenna for low band. It's aground-plane antenna with a similar radiating element that's fed with 50-Ohm line. The difference is that it's got radials on it instead of a mirrored counterpoise. There may be other subtle differences, but... Steve, aa5sg - Original Message - From: Paul Guello To: Repeater-Builder@yahoogroups.com Sent: Thursday, April 15, 2004 1:19 PM Subject: Re: [Repeater-Builder] Decibel repeater antenna question-unbalanced radiating loops There are not any baluns on these antennas. If I remember right, they use 75 ohm coax on each bay (odd multiples of quarter wave length) and 35 ohm coax on the feed (again odd multiples) to match the impedance to 50 ohms. This info was on the group a while back, somebody must still have it. Paul, kb9wlc Mathew Quaife [EMAIL PROTECTED] wrote: Would a close up pic of a DB304 work for your needs, or I have the DB420 there as well. Mathew bradley glen [EMAIL PROTECTED] wrote: HiI have been studying the db stacked array and thebayed array seems to use unbalanced dipoles as theradiators .I have tried to find a close up view of asingle dipole so I can confirm my ideas.If anyone has some good tech info on these antennas Iwould appreciate the info.It would make sense to " by-pass " the need of balunsfor each dipole -cost and balun loss?RegardsBrad ZS5WT Repeater Owner [EMAIL PROTECTED]__Do you Yahoo!?Yahoo! Tax Center - File online by April 15thhttp://taxes.yahoo.com/filing.htmlYahoo! 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/ Do you Yahoo!?Yahoo! Tax Center - File online by April 15th Do you Yahoo!?Yahoo! Tax Center - File online by April 15th 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] Decibel repeater antenna question-unbalanc ed radiating loops
Yep folks, theseare commonly referred to as "Phasing Harnesses" just like we use in the contest circles to stack multiple antennas and phase them so the feed point impedance still "sees" 50 ohms at the design frequency. Ron Rogers-WB8ERB- -Original Message-From: Steve Grantham [mailto:[EMAIL PROTECTED]Sent: Thursday, April 15, 2004 3:14 PMTo: Repeater-Builder@yahoogroups.comSubject: Re: [Repeater-Builder] Decibel repeater antenna question-unbalanced radiating loops I think you will find that the feed point is 50-Ohms whenfeeding one of these single unbalanceddipole elements.The harness is for makingthe multiple elements on the array look like one elementto thetransmission line. Look at their (DB's) folded unipole antenna for low band. It's aground-plane antenna with a similar radiating element that's fed with 50-Ohm line. The difference is that it's got radials on it instead of a mirrored counterpoise. There may be other subtle differences, but... Steve, aa5sg - Original Message - From: Paul Guello To: Repeater-Builder@yahoogroups.com Sent: Thursday, April 15, 2004 1:19 PM Subject: Re: [Repeater-Builder] Decibel repeater antenna question-unbalanced radiating loops There are not any baluns on these antennas. If I remember right, they use 75 ohm coax on each bay (odd multiples of quarter wave length) and 35 ohm coax on the feed (again odd multiples) to match the impedance to 50 ohms. This info was on the group a while back, somebody must still have it. Paul, kb9wlc Mathew Quaife [EMAIL PROTECTED] wrote: Would a close up pic of a DB304 work for your needs, or I have the DB420 there as well. Mathew bradley glen [EMAIL PROTECTED] wrote: HiI have been studying the db stacked array and thebayed array seems to use unbalanced dipoles as theradiators .I have tried to find a close up view of asingle dipole so I can confirm my ideas.If anyone has some good tech info on these antennas Iwould appreciate the info.It would make sense to " by-pass " the need of balunsfor each dipole -cost and balun loss?RegardsBrad ZS5WT Repeater Owner [EMAIL PROTECTED]__Do you Yahoo!?Yahoo! Tax Center - File online by April 15thhttp://taxes.yahoo.com/filing.htmlYahoo! 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/ Do you Yahoo!?Yahoo! Tax Center - File online by April 15th Do you Yahoo!?Yahoo! Tax Center - File online by April 15th 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] motorola uhf gm300 in 929.6625 mhz?
I have not kept up with other opinions but i would suspect it is NOT practical or possible to accomplish this. also with the failure of so many paging companies in the u.s. a 900 mhz transmitter can be had so cheaply that any reengineering of other radios is silly. even tha thams are buying purc 9000 for $500 anmd making hamband repeaters out of them so why try to reinvent to the wheel. a friend of mine has a lot of this stuff around. contact Steve Suker at central vermont communications 802 775 6726 in rutland vermont tell him Ted from MDM Radio sent you and explain your requirements. I fairly certain he can help you out or at least point you in thr right direction. I have a bunch of motorola 900 pagers and programmer si'd like to sell if you are in the market. entire lot will go cheap. also have r1801 programmer. good luck Ted Bleiman MDM Radio = Ted Bleiman K9MDM -just tired MDM Radio Ltd 1629-B N. 31 st Ave Melrose Park, IL 60160 708.681.0300 fax 708.681.9800 email [EMAIL PROTECTED] web http://www.mdmradio.com __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html 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] FCC considers Auxiliary Operation on 2M!
For everyone's Info: http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-04-79A1.pdf Yes, this means linking would be possible on 2M legally. (above 144.500 MHz except 145.800-146.000) Joe M. _ Excerpts from NOTICE OF PROPOSED RULEMAKING AND ORDER Adopted: March 31, 2004 Released: April 15, 2004 Comment Date: June 15, 2004 Reply Comment Date: June 30, 2004 The major rule changes we propose today are as follows: . Revise the operating privileges of amateur radio operators in four High Frequency bands; . Permit auxiliary stations to transmit on the 2 m amateur service band; . Permit amateur stations to transmit spread spectrum communications on the 1.25 m band; . Permit amateur stations to re-transmit communications from the International Space Station; . Allow amateur service licensees to designate the amateur radio club to receive their call sign, in memoriam; . Prohibit an applicant from filing more than one application for a specific vanity call sign; . Eliminate unnecessary restrictions imposed on certain equipment manufacturers; . Allow amateur radio stations in or near Alaska more flexibility in providing emergency communications; and . Eliminate unnecessary rules in the amateur radio operator license examination system. 17. Auxiliary stations. Background. The amateur service rules define an auxiliary station as an amateur station, other than one in a message forwarding system, that is transmitting point-to-point communications within a system of cooperating amateur stations. Section 97.213(a) of the Commissions Rules provides that an amateur station on or within 50 km of the Earths surface may be under telecommand where there is a radio or wireline control link between the control point and the station sufficient for the control operator to perform his or her duties. If the control link between the control point and the amateur station is a radio control link, then the control link must use an auxiliary station. An amateur station that is an auxiliary station may transmit on the 1.25 meter (m) and shorter wavelength bands, with certain exceptions. The underlying purpose of limiting auxiliary stations to these bands is to minimize the possibility of harmful interference to other amateur service stations and operations, particularly weak signal activity in the 2 m (144-148 MHz) band. 18. On November 4, 1999, Kenwood Communications Corp. (Kenwood), a manufacturer of amateur radio equipment, requested a declaratory ruling confirming that its Sky Command System (Sky Command) complies with the amateur service rules. Alternatively, Kenwood requested the Commission to grant blanket rule waivers so that amateur service licensees could utilize Sky Command. In 2000, the Public Safety and Private Wireless Division denied Kenwoods request, concluding that Section 97.201(b) of the Commissions Rules does not authorize auxiliary stations to transmit on the 2 m band, and that Kenwood did not meet the standards for a waiver request. 19. Subsequently, on May 1, 2001, Kenwood requested that we amend Section 97.201(b) of our Rules to allow auxiliary stations to transmit on the 2 m band above 144.5 MHz, except 145.8-146.0 MHz, in addition to the frequency segments previously authorized. Kenwood states that this proposed rule change would increase the flexibility of amateur radio licensees without adversely affecting other services or amateur radio stations that use the 2 m band, and would promote the development and use of new technology, including Sky Command. 20. Discussion. The Commission received twenty-four comments supporting Kenwoods request and sixteen comments opposing the request. Those supporting Kenwoods request state that (a) the 2 m band is not heavily used and such use is no different than other uses already occurring on the band, (b) auxiliary stations transmit on short distance simplex channels which would not cause interference to other stations on the band, (c) it would allow for the development of new emergency communication systems and capabilities and support other applications such as controlling an HF station in a vehicle, or from an antenna-restricted residence, and (d) it is consistent with flexible service rules. 21. On the other hand, some commenters state that it is not necessary for auxiliary stations to transmit on the 2 m band because sufficient amateur service spectrum is available on and above the 220 MHz band. Others claim that the 2 m band is heavily used, and argue that increased interference will occur if the rules are revised as Kenwood requests. Some commenters believe that existing rules are sufficient to address this concern, or that licensees can either address this issue amongst themselves or through existing coordination policies. 22. Because we have no basis to conclude that auxiliary stations transmitting on the 2 m band would cause harmful interference or
Re: [Repeater-Builder] Re: Audio Reproduction
Hi Joe, At some point in DSP, audio processing, synthesis, etc-all thrown into a bag and each manipulated withnumbers or programming, we sort of lose base with whatwe are doing. We could create AM, FM, PM, SSB, PSK,FSK, what have you. And as amateurs and technical people, it'd be good if we understoodboth the theory and the practice. Else, we become removed from theknowledge base and are prevented from participating. AFAIK, there haven't been any commercial two-wayradios built in the last 15 to 20 years that use PM. Icould be wrong, but I can't think of any. The PLL is anexcellent platform for afrequency modulator and exciter, assumingsuch things as phase noiseare controlled. It's not surprising the world has gone that way. Jeff's comments about DSP are also well taken. These arenew ways to get better results from old theory. The theoryhasn't changed and we should be familiar with it. 73, Bob 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] Decibel repeater antenna question-unbalanced radiating loops
Hi Guys Thanks for the notes -all noted and apppreciated. A close up of any of the db open systems , especially the close up of a single element would be greatly appreciated. I have done many searches on repeater antennas and it seems like the vhf\uhf standard in the USA is decibel . In my past company we did use the ASP series of 2 and 4-stacks-we outshined the competition by far -I always said it were decent antennas. I have made some single antennas years ago with some success using that very same principle.By reducing the folded dipole to mast(reflector) one decreases the feed impedance so by the comments from you , the harness ends with 75 Ohm coax onto the element it now makes some sense. I did recover one db-224 from a remote site which was damaged due to water (black death) right through. With so many of Db antennas used there should be a dedicated forum to Repeater Antennas . Kind regards Bradley GlenZS5WT --- Steve Grantham [EMAIL PROTECTED] wrote: I think you will find that the feed point is 50-Ohms when feeding one of these single unbalanced dipole elements. The harness is for making the multiple elements on the array look like one element to the transmission line. Look at their (DB's) folded unipole antenna for low band. It's a ground-plane antenna with a similar radiating element that's fed with 50-Ohm line. The difference is that it's got radials on it instead of a mirrored counterpoise. There may be other subtle differences, but... Steve, aa5sg - Original Message - From: Paul Guello To: Repeater-Builder@yahoogroups.com Sent: Thursday, April 15, 2004 1:19 PM Subject: Re: [Repeater-Builder] Decibel repeater antenna question-unbalanced radiating loops There are not any baluns on these antennas. If I remember right, they use 75 ohm coax on each bay (odd multiples of quarter wave length) and 35 ohm coax on the feed (again odd multiples) to match the impedance to 50 ohms. This info was on the group a while back, somebody must still have it. Paul, kb9wlc Mathew Quaife [EMAIL PROTECTED] wrote: Would a close up pic of a DB304 work for your needs, or I have the DB420 there as well. Mathew bradley glen [EMAIL PROTECTED] wrote: Hi I have been studying the db stacked array and the bayed array seems to use unbalanced dipoles as the radiators .I have tried to find a close up view of a single dipole so I can confirm my ideas. If anyone has some good tech info on these antennas I would appreciate the info. It would make sense to by-pass the need of baluns for each dipole -cost and balun loss? Regards Brad ZS5WT Repeater Owner [EMAIL PROTECTED] __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html Yahoo! Groups Links Do you Yahoo!? Yahoo! Tax Center - File online by April 15th -- Do you Yahoo!? Yahoo! Tax Center - File online by April 15th -- Yahoo! Groups Links a.. To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ b.. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html 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/
