[Repeater-Builder] Question for the group
I have a very broad band uhf antenna on a tower . I would like to run a 440 MHz machine and a 462 MHz machine off of the same antenna . Can I use a notch type mobile duplexer to combine the 2 machines to 1 ant for both TX and RX to notch the respective TX freqs after the duplexers that are on the 2 machines . Merrill KG4IDD
Re: [Repeater-Builder] Re: VHF Vari-Notch Duplexers - 2" x 2" x 4" ???
Next question what channel spacing are you tuning them for ? Merrill KG4IDD On 1/28/2010 8:56 PM, tahrens301 wrote: > Hi Merrill, > > Yep, that's what the label says. > > Now, gotta figure out why they aren't > living up to specs. > > Tnx > > Tim > > > > --- In Repeater-Builder@yahoogroups.com, Merrill wrote: > >> Tx-Rx model 28-41-05 "Vari-Notch" pseudo-pass, notch >> duplexer. >> This is the appx two RU duplexer for wide split repeaters, >> Comprised of five of the two inch square cavities. >> Tx-Rx manual says 2.5 mhz spacing. >> Tag says Tx 1.5 dB insertion for 76 dB isolation, and Rx is 1.1 dB for >> 110dB(Tx is 76dB at Rx and Rx is 110 at Tx) >> Three cavities on Rx, two on Tx. >> >> >> >> On 1/28/2010 8:28 PM, tahrens301 wrote: >> >>> Hi Rob, >>> >>> Sorry, I forgot to put the model number in the original >>> posting! >>> >>> It's 28-41-05 >>> >>> It has 3 of the blocks in the TX line, and 2 in the >>> RX. It's in a 2 1/4" thick rack panel. >>> >>> I opened one up, and it looks like a helical resonator >>> with a silver slug that goes in and out, and the BNC >>> connectors have a loop that is 90 degrees to the larger >>> coil and has an air variable cap to ground. >>> >>> thanks! >>> >>> Tim >>> >>> >>> >>> --- In Repeater-Builder@yahoogroups.com, "Rob Lee" wrote: >>> >>> >>>> The duplexer that you have may not be a "Vari-Notch" unit. Your description >>>> sounds like a "30 series" unit (Model number will start with a 30 e.g. >>>> 30-36-01A) >>>> >>>> The 30 series VHF duplexers are specially designed to work with repeaters >>>> that exhibit problems when connected to high selectivity duplexers. This >>>> design uses three standard notch type filters on the transmitter side which >>>> provide excellent noise filtering while maintaining a relatively low VSWR >>>> over a wide frequency range. This helps minimize transmitter sensitivity to >>>> cable length between the duplexer and the transmitter and also reduces the >>>> potential for transmitter spurs. >>>> >>>> The receiver portion of the duplexer incorporates three pseudo bandpass >>>> filters to give isolation to the transmit carrier and reduce interference >>>> and intermodulation caused by other nearby transmitters. >>>> >>>> Because different types of cavity filters are used for the transmit and >>>> receive sides of the duplexer, it is important that the correct model be >>>> used. Model numbers are different for units designed for either the >>>> transmitter higher or lower than the receiver frequency. >>>> >>>> I have tuning instructions if this sounds like the unit. >>>> >>>> Rob K7TGU >>>> >>>> >>>> - Original Message - >>>> From: "tahrens301" >>>> To: >>>> Sent: Thursday, January 28, 2010 15:37 >>>> Subject: [Repeater-Builder] VHF Vari-Notch Duplexers - 2" x 2" x 4" ??? >>>> >>>> >>>> >>>> >>>>> Well, I thought this thing was tuned up, >>>>> but obviously something is wrong. >>>>> >>>>> These are a set of the 2x2x4" cavities... >>>>> have a plunger in the front, and a variable >>>>> cap adjustment on the back. Also, a pair of >>>>> BNC connectors on the capacitor side. >>>>> >>>>> The plate says Duplexer Vari-Notch, >>>>> 147-174 >>>>> >>>>> It also implies that the TX has a 1.5dB >>>>> insertion loss, but darned if I can get >>>>> only about 4.5. >>>>> >>>>> I've talked to the guys at TX/RX, and they >>>>> are looking for a book on them, but nothing >>>>> yet. >>>>> >>>>> Anybody have any tuning instructions/info on >>>>> them? >>>>> >>>>> The plunger is marked 'pass low', and the cap >>>>> is reject high. Pretty much self explanatory, >>>>> and they tune ok, but the insertion loss is >>>>> higher than it appears it should be. >>>>> >>>>> Thanks, >>>>> >>>>> Tim >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> Yahoo! Groups Links >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>> >>> >>> >>> >>> >>> >>> Yahoo! Groups Links >>> >>> >>> >>> >>> >>> >> > > > > > > > > Yahoo! Groups Links > > > > >
Re: [Repeater-Builder] Re: VHF Vari-Notch Duplexers - 2" x 2" x 4" ???
Tx-Rx model 28-41-05 "Vari-Notch" pseudo-pass, notch duplexer. This is the appx two RU duplexer for wide split repeaters, Comprised of five of the two inch square cavities. Tx-Rx manual says 2.5 mhz spacing. Tag says Tx 1.5 dB insertion for 76 dB isolation, and Rx is 1.1 dB for 110dB(Tx is 76dB at Rx and Rx is 110 at Tx) Three cavities on Rx, two on Tx. On 1/28/2010 8:28 PM, tahrens301 wrote: > Hi Rob, > > Sorry, I forgot to put the model number in the original > posting! > > It's 28-41-05 > > It has 3 of the blocks in the TX line, and 2 in the > RX. It's in a 2 1/4" thick rack panel. > > I opened one up, and it looks like a helical resonator > with a silver slug that goes in and out, and the BNC > connectors have a loop that is 90 degrees to the larger > coil and has an air variable cap to ground. > > thanks! > > Tim > > > > --- In Repeater-Builder@yahoogroups.com, "Rob Lee" wrote: > >> >> The duplexer that you have may not be a "Vari-Notch" unit. Your description >> sounds like a "30 series" unit (Model number will start with a 30 e.g. >> 30-36-01A) >> >> The 30 series VHF duplexers are specially designed to work with repeaters >> that exhibit problems when connected to high selectivity duplexers. This >> design uses three standard notch type filters on the transmitter side which >> provide excellent noise filtering while maintaining a relatively low VSWR >> over a wide frequency range. This helps minimize transmitter sensitivity to >> cable length between the duplexer and the transmitter and also reduces the >> potential for transmitter spurs. >> >> The receiver portion of the duplexer incorporates three pseudo bandpass >> filters to give isolation to the transmit carrier and reduce interference >> and intermodulation caused by other nearby transmitters. >> >> Because different types of cavity filters are used for the transmit and >> receive sides of the duplexer, it is important that the correct model be >> used. Model numbers are different for units designed for either the >> transmitter higher or lower than the receiver frequency. >> >> I have tuning instructions if this sounds like the unit. >> >> Rob K7TGU >> >> >> - Original Message - >> From: "tahrens301" >> To: >> Sent: Thursday, January 28, 2010 15:37 >> Subject: [Repeater-Builder] VHF Vari-Notch Duplexers - 2" x 2" x 4" ??? >> >> >> >>> Well, I thought this thing was tuned up, >>> but obviously something is wrong. >>> >>> These are a set of the 2x2x4" cavities... >>> have a plunger in the front, and a variable >>> cap adjustment on the back. Also, a pair of >>> BNC connectors on the capacitor side. >>> >>> The plate says Duplexer Vari-Notch, >>> 147-174 >>> >>> It also implies that the TX has a 1.5dB >>> insertion loss, but darned if I can get >>> only about 4.5. >>> >>> I've talked to the guys at TX/RX, and they >>> are looking for a book on them, but nothing >>> yet. >>> >>> Anybody have any tuning instructions/info on >>> them? >>> >>> The plunger is marked 'pass low', and the cap >>> is reject high. Pretty much self explanatory, >>> and they tune ok, but the insertion loss is >>> higher than it appears it should be. >>> >>> Thanks, >>> >>> Tim >>> >>> >>> >>> >>> >>> >>> >>> >>> Yahoo! Groups Links >>> >>> >>> >>> >> > > > > > > > > Yahoo! Groups Links > > > > >
Re: [Repeater-Builder] supply
I can not find a tpn # that is the problem . This supply worked great until it started putting out 22 volts I am thinking of repairing it .but working blind is not my style. Merrill KG4IDD Jeff DePolo wrote: I was going to guess Motran, but it's been so long since I've seen one I can't be sure. Take the paper target and the power supply out to a rifle range and go "Office Space" on it. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Bill Hudson Sent: Thursday, March 26, 2009 7:18 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] supply Find the TPN- Number on it. Then Google it. Looks like Mocom 70 era of Motorola Supplies Bill From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Merrill Sent: Thursday, March 26, 2009 4:06 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] supply can anyone identify this supply thanks in advance Merrill KG4IDD No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.238 / Virus Database: 270.11.3/1970 - Release Date: 03/26/09 07:12:00 Yahoo! Groups Links
[Repeater-Builder] MR4 receiver
I have a MR4 receiver that the squelch will not close on . any ideas . Merrill KG4IDD
Re: [Repeater-Builder] Cellwave Duplexers
A small mobile duplexer will due fine for your use Merrill KG4IDD WPTZ430 Richard Bessey wrote: > All, > I am hopeful you could all enlighten a beginner. > > I have a GMRS repeater up and rolling with two antennas using a Uniden > ARU-251 repeater. Its not perfect but it works. > I am shopping for a duplexer and found the little Cellwave duplexers on > Ebay, I can get one tuned and to my door step for roughly $100 > > Good/Bad? > > The locals tell me I have to get a large duplexer that is any good, is > that true? From what I understand, the larger the more efficient but I > am not 100% sure. > > Any thoughts would be greatly appreciated. > >
[Repeater-Builder] tld 2602a
What is the min and max drive needed on a tld 2602a .I have one and I do not have the specs. Merrill KG4IDD
Re: [Repeater-Builder] Re: Motorola TLD6612A amp repair
if you have an amp that is tube I would be interested for 2m contact off list merrill kg4idd kg4idd at gmail.com [EMAIL PROTECTED] wrote: > What series station is thisTLD6612A amp used in? MICOR? MOTRAC? > > > -Original Message- > From: Thomas Oliver > Sent: Feb 25, 2008 3:01 PM > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair > > If you need another whole amp or transmitter let me know, not > interested in > taking a working one apart to rob the insulator. > > tom > > > [Original Message] > > From: skipp025 <[EMAIL PROTECTED] <mailto:skipp025%40yahoo.com>> > > To: <mailto:Repeater-Builder%40yahoogroups.com>> > > Date: 2/25/2008 12:08:05 PM > > Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair > > > > Hi John, > > > > > "kf0m" <[EMAIL PROTECTED]> wrote: > > > I am working on repair of a TLD6612A 2 meter repeater amp > > > that runs a pair of 8560AS tubes. > > > > Should be quite the smokin' signal when you have the amplifeir > > in line. > > > > > It worked fine for a number of years and then suffered > > > what appeared to be lightning damage. > > > > > > The insulator between the plate line and the plate tuning > > > disc was arced through among other damage. It is a rectangular > > > piece of clear material that looks like mica. > > > > If it is a clearish but dark material it probably is mica. If > > it's the thicker white insulating material it might be beryllium > > oxide, which has danger warnings about breathing any dust from > > the material when drilling or cutting into it. > > > > > I tried adding some Teflon tape to cover up the puncture. > > > > Nope, ain't gonna work. > > > > > When I fired up the amp today, It arced through again during > > > the tune up process. Anyone have suggestions for a replacement > > > or have one in their junk box? > > > > > > John Lock > > > kf0m at arrl.net > > > > Google mica sheet and or look at companies like McMaster Carr. You > > can often find small sheets and parts at woodstove and appliance > > repair places/stores. > > > > www.antiquestoves.com is one place I found some mica sheeting > > available on line. > > > > And of course I searched "mica sheet" on Ebay and hit 10 or so > > supply sources right off the starting line. > > > > cheers, > > s. > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > -- > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.516 / Virus Database: 269.20.9/1292 - Release Date: > 2/21/2008 4:09 PM > >
Re: [Repeater-Builder] Re: 3 Channel UHF Ferrite Combiner
I would have interest in this also as I need to combine 443.150 and 462.600 to 1 ant thank you Merrill KG4IDD Mike Mullarkey wrote: > > HI Skip, > > > > Very tight outdoor cabinet. We need to combine TX 447.750, 447,850 and > 464.900 into one antenna. I know this is not optimum but this is what > we have to work with. > > > > Mike Mullarkey (K7PFJ) > > > > *From:* Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] *On Behalf Of *skipp025 > *Sent:* Sunday, September 16, 2007 9:05 AM > *To:* Repeater-Builder@yahoogroups.com > *Subject:* [Repeater-Builder] Re: 3 Channel UHF Ferrite Combiner > > > > There is more than one type of combiner possible... depending on > frequency spacing, band of operation and power level. > s. > > > "Mike Mullarkey" <[EMAIL PROTECTED]> wrote: > > > > Ok, I been all over the web and cant seem to find any documentation > on the > > critical cable lengths to build a 3 channel combiner. Does anyone > happen to > > have such a document. > > > > > > > > Thanks, > > > > > > > > Mike Mullarkey (K7PFJ) > > > >
Re: [Repeater-Builder] Re: Would You..... tower height question
199 feet merrill kg4idd texasexpediter wrote: > What is the maximum height a tower can be without falling under all > the lighting, painting etc. regulations? > > > > > > > Yahoo! Groups Links > > > > >
Re: [Repeater-Builder] VHF to UHF mod. for duplexer
So would I I will trade him 2 sets of uhf duplexer for 1 vhf KG4IDD Jeff DePolo wrote: > I'd be happy to trade you (or anyone else) a nice UHF duplexer for your > highband duplexer. Have many to choose from... > > >> -Original Message- >> From: Repeater-Builder@yahoogroups.com >> [mailto:[EMAIL PROTECTED] On Behalf Of n3dab >> Sent: Thursday, June 07, 2007 5:29 PM >> To: Repeater-Builder@yahoogroups.com >> Subject: [Repeater-Builder] VHF to UHF mod. for duplexer >> >> Since the Question has been raised, I have a Sinclair VHF >> Q2220E that I >> would like to use on the UHF band. Can any one point me to a >> mod. page >> or funish info as to how they succesfully modded there Q2220E for >> operation in the UHF band. I assume the loops and harness would >> require modding but have no idea about the tuning rods, capaciters or >> the aluminum extruded cavities. >> >> PS : I also posted a noted asking about a source of Motorola T1500 >> series passband coupling loops (.5 to 1.0 dB IL). I'm just >> looking for >> the loops but will take complete can(s) if they are reasonable. >> >> Thanks >> Doug N3DAB >> >> >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> No virus found in this incoming message. >> Checked by AVG Free Edition. >> Version: 7.5.472 / Virus Database: 269.8.11/837 - Release >> Date: 6/6/2007 2:03 PM >> >> >> > > > > > > > Yahoo! Groups Links > > > > >
Re: [Repeater-Builder] Re: When 4, 6 or 8 Cavities just won't due...
they are all notch Cavities merrill KG4IDD Coy Hilton wrote: > Here is another possibility, it could be a standard duplexer with two > receive outputs. The cans could be Bp Br, using a High Q caps in the > loops. I really cant tell. > > > --- In Repeater-Builder@yahoogroups.com, "skipp025" <[EMAIL PROTECTED]> > wrote: > >> Re: When 4, 6 or 8 Cavities just won't due... >> >> Another Ebay gem: >> >> DB PRODUCTS 9-CAVITY RADIO REPEATER DUPLEXER-100DB-HAM >> Ebay Item number: 250120910164 >> >> I don't know to be impressed or just laugh at all the >> hardware (number of cavities used). >> >> cheers, >> skipp >> >> > > > > > > > > Yahoo! Groups Links > > > > >
[Repeater-Builder] receiver
I need to hook up a non Motorola receiver to a micor repeater I am going to remove the original and want to use the Motorola hang trimmer card and timeout timer card need to know were to hook up cos and audio in 440 band Any help please 73 merrill KG4IDD 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/
