Re: [Repeater-Builder] Just a Crazy Thought
Link to 11 meter repeaters video. http://www.youtube.com/watch?v=0pWB17LzsHk --- On Thu, 2/11/10, i recycle computers wrote: From: i recycle computers Subject: [Repeater-Builder] Just a Crazy Thought To: Repeater-Builder@yahoogroups.com Date: Thursday, February 11, 2010, 8:29 PM I have heard numorous urban legends of 27 MHz CB repeaters being built. has anyone ever come across such a thing. if not does anyone think it is even possible from a technical standpoint? the limitations are AM mode, and using any of the 40 CB channels with 4 watts PEP AM or 12 Watts PEP SSB ie: using completely un modified type certified CB gear. Legally a repeater is illegal on CB, but i just want to do an excersize in thought as to what problems someone may run into with such a project, etc. i have seen this questioned asked numorous times through the years and even heard rumors of it actually being done. no one though has actually went deep into the technical aspects of such a project or could point me out to the people who are operating or operated such a setup. Thanks, Rev. Robert P. Chrysafis I Recycle Computers "Saving UnWanted PC's From The Landfill One Computer At A Time :)" Listen To My Free Live Police Scanner Feed for Tuscaloosa / Northport http://www.radioref erence.com/ apps/audio/ ?feedId=3836
Re: [Repeater-Builder] Just a Crazy Thought
Here is a link that has a video on youtube i have heard these before. So it is possible to implement. SD --- On Thu, 2/11/10, i recycle computers wrote: From: i recycle computers Subject: [Repeater-Builder] Just a Crazy Thought To: Repeater-Builder@yahoogroups.com Date: Thursday, February 11, 2010, 8:29 PM I have heard numorous urban legends of 27 MHz CB repeaters being built. has anyone ever come across such a thing. if not does anyone think it is even possible from a technical standpoint? the limitations are AM mode, and using any of the 40 CB channels with 4 watts PEP AM or 12 Watts PEP SSB ie: using completely un modified type certified CB gear. Legally a repeater is illegal on CB, but i just want to do an excersize in thought as to what problems someone may run into with such a project, etc. i have seen this questioned asked numorous times through the years and even heard rumors of it actually being done. no one though has actually went deep into the technical aspects of such a project or could point me out to the people who are operating or operated such a setup. Thanks, Rev. Robert P. Chrysafis I Recycle Computers "Saving UnWanted PC's From The Landfill One Computer At A Time :)" Listen To My Free Live Police Scanner Feed for Tuscaloosa / Northport http://www.radioref erence.com/ apps/audio/ ?feedId=3836
Re: [Repeater-Builder] EF Johnson 25A rack mount power Supply
i have no idea what the receptacle on the power supply is used for.
Do not hook a radio to the{ receptacle on the power supply } It is used to
connect and charge a 12 Volt backup battery.
You can hook your radio/repeater or a fuse distribution block to the free
hanging red/black cables.
SD
--- On Sun, 9/20/09, Lee Pennington wrote:
From: Lee Pennington
Subject: Re: [Repeater-Builder] EF Johnson 25A rack mount power Supply
To: Repeater-Builder@yahoogroups.com
Date: Sunday, September 20, 2009, 1:34 PM
Guane;
I have one too. The "free hanging" cable plugs directly into the matchimg
receptacle on the EF Johnson radio, i have no idea what the receptacle on the
power supply is used for. I'm still waiting for a definite I.D. and manual for
the home brew repeater rig I have. The closest thing I have to an ID/serial #
is : 0073CO22A. Manufactured August 1982.
de Lee
K4LJP
73
On Sun, Sep 20, 2009 at 12:57 PM, lbd9992001 wrote:
I have an old EF Johnson 25A 14VDC rack mount power supply. The part number on
it is "023-3341-012. The supply has a pigtail EFJ-style (male, female monster
banana pin) receptacle on the power supply chassis and a freehanging one on a
short cable. Can anyone provide a wiring diagram/schematic or at least
enlighten me as to how the cable and chassis connectors are to be connected to
a load?
Thanks,
Duane Fowler
--
"Always drink upstream from the herd."
Re: [Repeater-Builder] Re: What is this antenna??? DB 406
DB 406 pre 1970 Re: [Repeater-Builder] DB-406 450-470MHz how useful on 440-450MHz? James 10 Aug 2004 00:31:31 - window.google_render_ad(); I had a DB404 (I think that was the number, two dipoles each side of the stick, 5 or 6 ft long?). This was made for 450-470 and the SWR was good at 441 (repeater output), however, I believe there was possibly a ton of uptilt as the coverage off the hill was horrible (even a diamond worked better ... I know ... don't mention that word :) ). I would test it and see how it does. James Chuck Kelsey wrote: By all means. Then you'll have your answer. Chuck WB2EDV - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Monday, August 09, 2004 5:45 PM Subject: Re: Re: [Repeater-Builder] DB-406 450-470MHz how useful on 440-450MHz? It is a folded dipole. I just checked Andrew's web site it is like the DB-411. I didn't know folded dipoles were so broad at these frequencies. I guess the next thing to do is test it out with and SWR meter. Steve WA6ZFT From: "Chuck Kelsey" <[EMAIL PROTECTED]> Date: 2004/08/09 Mon PM 05:32:44 EDT To: Subject: Re: [Repeater-Builder] DB-406 450-470MHz how useful on 440-450MHz? Maybe the 406 is an older model, my catalog doesn't show it. What type antenna is it? If it's a folded dipole array, you should be able to use it as is. Chuck WB2EDV - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Monday, August 09, 2004 4:02 PM Subject: [Repeater-Builder] DB-406 450-470MHz how useful on 440-450MHz? Regarding a DB-406 cut for 450-470MHz: How effective is it if used in the 440-450MHz region unmodified? If performace is sub-optimal, can the elements be extended, and will the phasing harness need to be lengthened? If it can be modified without being a labor of love, what's involved? (In your opinion whould it be a waste of time?) Thanks, Steve WA6ZFT --- On Sat, 3/28/09, Chuck Kelsey wrote: From: Chuck Kelsey Subject: Re: [Repeater-Builder] Re: What is this antenna??? To: Repeater-Builder@yahoogroups.com Date: Saturday, March 28, 2009, 4:16 PM That's how I remember them too. Chuck WB2EDV - Original Message - From: "Laryn Lohman" To: Sent: Saturday, March 28, 2009 5:02 PM Subject: [Repeater-Builder] Re: What is this antenna??? > --- In Repeater-Builder@ yahoogroups. com, "Jeff DePolo" wrote: >> >> >> If the elements are flat (not tubing), then it's a DB410. They stopped >> making them probably in the early 80's? > > Interesting Jeff, the DB410 pictured and described in my old DB catalog > looks EXACTLY like a modern DB420. The elements are described as being > 3/8" OD aluminum. > > Laryn K8TVZ > >
Re: [Repeater-Builder] Decibel DB-4076
YES will tune just fine. --- On Tue, 3/24/09, Randy wrote: From: Randy Subject: [Repeater-Builder] Decibel DB-4076 To: Repeater-Builder@yahoogroups.com Date: Tuesday, March 24, 2009, 2:50 PM Hello Group will the Decibel DB-4076 Tune into the 444xxx 449xxx Amateur band We looking for a Low power 25 watts or so poratable duplexer and come across of of these. Randy
Re: [Repeater-Builder] LOOKING FOR 250W OR MORE S.S.LOW BAND AMP
Low Mid or High Frequency Range ? --- On Thu, 3/5/09, radiotwo1955 wrote: From: radiotwo1955 Subject: [Repeater-Builder] LOOKING FOR 250W OR MORE S.S.LOW BAND AMP To: Repeater-Builder@yahoogroups.com Date: Thursday, March 5, 2009, 7:04 AM LOOKING FOR A HIGH POWER LOW BAND AMP WORKING OR NOT ANY SPLIT. REASONABLE PLEASE THANKS BOB 607 436 2287
Re: [Repeater-Builder] Re: OT: Radios and Coms in TV and Movies
Check this site it may have some useful info. SD http://harrymarnell.net/ --- On Tue, 12/23/08, Albert wrote: From: Albert Subject: [Repeater-Builder] Re: OT: Radios and Coms in TV and Movies To: Repeater-Builder@yahoogroups.com Date: Tuesday, December 23, 2008, 10:08 PM Wow Guys! This was exactly the kind of information I was looking for. I always think it is neat to hear a little history from people who have been there and done that. I will have to go back and reread all of the posts to soak all of it up. Thanks again --- In Repeater-Builder@ yahoogroups. com, "Albert" wrote: > > I was wondering if anyone had links to any websites that talk about > radios used in TV and Movies. > > What got me thinking about this was that I had been watching the old > TV show Emergency on Netflix. (remember squad 51, rampart hospital, etc.) > > I know some of the stuff is just props but I thought some of it might > be real equipment that I don't recognize. For instance one of the > characters (Roy) often carries an HT into the hospital when they drop > off a patient. I think it is an HT220 since it has a telescoping > antenna, but might be a MT500. > > Thanks >
Re: [Repeater-Builder] New Orleans 440 Repeaters
WWW.LACOUNCIL.NET should help. SD --- On Sun, 9/7/08, KD4PBC <[EMAIL PROTECTED]> wrote: From: KD4PBC <[EMAIL PROTECTED]> Subject: [Repeater-Builder] New Orleans 440 Repeaters To: "KD4PBC" <[EMAIL PROTECTED]> Date: Sunday, September 7, 2008, 9:27 AM Hi all, Does anybody know if 444.975 444.950 444.925 444.900 Is used in the Hammond, LA area ? I have forum several listings but none seem to be up to date. I’m trying to take a 440 machine down to the Louisiana Renaissance Festival (www.larf.org) for local hams. And I going before I have a frequency. I want to stay in the upper end of the band so I can put it on the onsite combiner. Any help ? Thanks Guys Robert / KD4PBC
Re: [Repeater-Builder] Re: Low Band Base Antenna Info Wanted
The antenna he is trying to tune is designed to use horizontal radials. The matching coil in the base of the antenna shunt feeds the vertical element and provides a 50 ohm match. Sd --- On Mon, 8/18/08, Ralph Mowery <[EMAIL PROTECTED]> wrote: From: Ralph Mowery <[EMAIL PROTECTED]> Subject: Re: [Repeater-Builder] Re: Low Band Base Antenna Info Wanted To: Repeater-Builder@yahoogroups.com Date: Monday, August 18, 2008, 5:18 PM > Also I remember there is an optimum angle to > "droop" them to get the > main lobe at the horizon-I want to say between 30 and 45 > degrees down > from horizontal. Affects impedance too if I > remember...it' s late > > > The ground plane elements are usually drooped about 45 deg to get the impedance to around 50 ohms. It is around 36 ohms if left horizontal.
Re: [Repeater-Builder] Re: Low Band Base Antenna Info Wanted
Mark all measure the radials they should be 102-108 inches if they have not ben cut or shortened. The radial construction for this style antenna consisted of two solid alu rods that threaded together. With the correct radial length just tune the length of the vertical element for lowest swr at your 10 meter frequency done. Depending on the vintage of your antenna the length may vary from 16-18 feet or 19-21 feet the coil inside the base were set up to match either a halfwave or 5/8wave vertical element. I have acouple that work great but cant measure since they are in the air. 73 SD --- On Mon, 8/11/08, lenaw12 <[EMAIL PROTECTED]> wrote: From: lenaw12 <[EMAIL PROTECTED]> Subject: [Repeater-Builder] Re: Low Band Base Antenna Info Wanted To: Repeater-Builder@yahoogroups.com Date: Monday, August 11, 2008, 8:47 PM Hi Mark... How about you save some aluminum tubing by not cutting the radials too short for 10 meterscut 4 radials about 1/4 wavelength or so for your mid-band 10 meter frequency... start with maximum vertical antenna length and slide the tubing into each other to get your lowest SWR. If your SWR goes up as you compress from maximum length, you need to lengthen one of the vertical tubes. Cheaper, faster. saves energy... LW --- In Repeater-Builder@ yahoogroups. com, "mark_n2mh" <[EMAIL PROTECTED]> wrote: > > Hello to the Group, > > Does anyone have any information or a cutting chart for the following > antenna? I have one and would like to put it into service on 10 > meters. It was given to me without any info or radials. It is > definitely used but appears to be intact. A quick web search turned up > nothing. > > Sticker Info on antenna: > > Antenna Specialists > Dallas TX 75247-6780 > ASPA 2010 > 30-40 MHz > 9209508 > Serial x-x > > It looks like a commercial version of a CB base antenna. The vertical > radiator is a series of telescoping aluminum tubing pieces held in > place with hose clamps. Maximum extended length of the vertical > element is approximately 21 feet. Minimum contracted length is > approximately 5 feet. The antenna uses 4 radials and the radial clamps > appear to accept 5/16 inch rods. (I'm not sure if the radials are > supposed to stick out straight or droop at some desired angle.) > > If nobody has any info, does the following tuneup procedure seem correct? > > 1. Cut a set of radials for 1/4 wL at 35 MHz. > 2. Adjust the vertical radiator for best SWR within 30-40 MHz. > 3. Measure and record vertical element, radial lengths, and frequency. > 4. Scale recorded dimensions to the desired 10 meter frequency. > > Thanks and 73, > Mark, N2MH >
Re: [Repeater-Builder] Re: DB201 warning
The reason the DB201 is prone to IM in duplex service is that corrosion shows up in the connection where the element fits inside a cast aluminum adapter on top of the insulator. Over time this joint fills with moisture and becomes corroded.On the later models the connection was changed to a set screw instead of a sandwich with two bolts. This problem even had an effect on the loband ranges as the connection would fail mechanically. Some waterproofing of this joint has proved to extend the life of these antennas both RF wise and mechanically. SD - Original Message - From: "Paul Finch" <[EMAIL PROTECTED]> To: Sent: Monday, December 12, 2005 8:21 AM Subject: RE: [Repeater-Builder] Re: DB201 warning > Skipp, > > Can you explain why the DB201 is prone to intermod? Why is it any more > prone than a DB410, DB224 or any other folded dipole antenna? This is > interesting, I have never heard of this problem before. > > Paul > WB5IDM > > > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of skipp025 > Sent: Sunday, December 11, 2005 1:51 PM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Re: DB201 warning > > > I've got to post this information regardless of opinions. > > The UHF DB-201 UHF 450-470 antenna is a well known IMD > generator when placed anywhere semi close to other metal > objects. > > I fought many a gremlin sourced back to the UHF DB > antenna. (no problems to report with the vhf or low > band version). Motorola used to supply them with new > base station installs sold to customers. > > Customers would put the UHF Antenna in or around a > building and it would inter-react with nearby objects > and crap the whole system. > > I lost count over the number of problematic db-201 > type/brand uhf antennas I changed out repeater systems > through the years. > > There are a number of antenna models, which have > proven to be real trouble makers. The UHF DB-201 is > one such animal. Another is the VHF Sinclair SLR/SRL-235 > antenna. > > Avoid using the UHF DB-201 or equivalent antenna > where possible. Unless you're into self abuse. > > cheers, > skipp > >> > Anyone know if there are any differences between the >> > Hi-band vs. the UHF versions of the DB201? ie. can >> > one tuned for 170MHz be retuned for 450? >> > Looking at the drawings and specs they all seem to >> > be the same with the exception of the low band ones >> > having a longer support pipe. >> > Thanks, >> > Steve > > > > > > > > > > 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] DB201
Tune away done it before SD - Original Message - From: "Steven Passmore, kf6fkk" <[EMAIL PROTECTED]> To: Sent: Sunday, December 11, 2005 1:43 AM Subject: [Repeater-Builder] DB201 > Anyone know if there are any differences between the Hi-band vs. the UHF > versions of the DB201? ie. can one tuned for 170MHz be retuned for 450? > Looking at the drawings and specs they all seem to be the same with the > exception of the low band ones having a longer support pipe. > > Thanks, > Steve > > > > > > > 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] HELP WITH
From what i remember 4 in 45 out SD - Original Message - From: jqp To: Repeater-Builder@yahoogroups.com Sent: Wednesday, October 13, 2004 8:12 PM Subject: [Repeater-Builder] HELP WITH I got an old RF Gain RF 445 U rack mount amp looking for any specs and tech data on it if you can help? thanks. 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-212 Harness
DB says that for the greatest gain spacing should .95 wavelength measured from the center of each loop. - Original Message - From: "Tony lelieveld" <[EMAIL PROTECTED]> To: Sent: Monday, October 04, 2004 10:41 PM Subject: RE: [Repeater-Builder] DB-212 Harness > > > > > Does any one know the formula to make a harness for 2 of the db-212 > and for 4 of them?Also how far apart?thanks Mike KC8FWD > > I have a PDF file at work on the DB-212 which gives information on all the > 212 configurations. I will submit it as soon as I can. I do know that > the > cable coming from each dipole is 50 Ohm and where they join in a Y (now 25 > Ohm) is a 1/4 wave stub made from 35 Ohm cable to get back to 50 Ohm > again. > 73, Tony VE3DWI > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004 > > > > > > > > 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] Identify this antenna manufacturer
Looks like a communications products or Hy-Gain. The Hy-Gain versions from the late 60's and70's had a blue colored insulator. Saw a Hy-Gain version this summer still in the air and had good swr. Was installed in 1968.It was located in East Texas. My 2c > 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] Happy Holidays
3.870 7:30 central - Original Message - From: "Don" <[EMAIL PROTECTED]> To: Sent: Wednesday, December 24, 2003 6:09 PM Subject: [Repeater-Builder] Happy Holidays > Trying to find a Santa freq for my 3 yr old Granddaughter one of 14 and > at 57 that is a lot , any nets going on > > > > Happy Holidays to All > http://web.icq.com/shockwave/0,,4845,00.swf > > 73 De Don KA9QJG > > > > > > > > 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/ > > 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] High Pass Audio Filter
Post away we are waiting. - Original Message - From: "skipp025" <[EMAIL PROTECTED]> To: Sent: Sunday, November 23, 2003 1:01 PM Subject: [Repeater-Builder] High Pass Audio Filter > So some of you are asking for a high > pass filter circuit? > > There are the much used Comm Spec > TS-32 filter circuits which are > easily bought/built & modified. > > There are a lot of diagrams on the > web which are lifted from commercial > designs. Not so many original designs. > > If you folks are serious about > building one, I can post the TS-32 > unit which is pretty basic, or a > very serious one which I have here. > > Other thoughts might be partial > circuits lifted from commercial > tone panels and LTR units. > > cheers > skipp > > skipp025 atyahoo.com > > > > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
