[Repeater-Builder] Re: Duplexer on the cheap worries

Thanks for the replies. I don't have the high end equipment to do some of the testing mentioned. I do have a service monitor and a dummy load, along with numerous receivers. The dummy load is kind of suspect (old and not really liking the strange signals I get from it at times) but it is all we

Re: [Repeater-Builder] Re: Duplexer notch blurred - why?

Thanks Chuck 73 Steve,M1SWB(UK) - Original Message - From: "Chuck Kelsey" To: Sent: Thursday, May 20, 2010 11:57 PM Subject: Re: [Repeater-Builder] Re: Duplexer notch blurred - why? > Yahoo has been messing up over the last few weeks. I've been getting &g

Re: [Repeater-Builder] Re: Duplexer notch blurred - why?

Yahoo has been messing up over the last few weeks. I've been getting multiple posts too. Chuck - Original Message - From: "Steve" To: Sent: Thursday, May 20, 2010 6:48 PM Subject: Re: [Repeater-Builder] Re: Duplexer notch blurred - why? > why do I see the same message twice ?.

Re: [Repeater-Builder] Re: Duplexer notch blurred - why?

why do I see the same message twice ?. - Original Message - From: "cruizzer77" To: Sent: Thursday, May 20, 2010 11:39 PM Subject: [Repeater-Builder] Re: Duplexer notch blurred - why? > > > I only had a quick try tonight and found that I can get a pretty sharp >

[Repeater-Builder] Re: Duplexer notch blurred - why?

I only had a quick try tonight and found that I can get a pretty sharp line on the display if I turn the rf gen amplitude up to 10dBm. Then I need to turn down the ref level to 20dBm to have the curve inside the display at all. Furthermore there was a warning "change rf gen amplitude, output

[Repeater-Builder] Re: Duplexer notch blurred - why?

Thanks for all replies. First of all this is the first duplexer I'm building and I'm not a very experienced user of the spectrum analyzer/tracking generator so it is possible that I adjusted something wrong as some of you point out. I'll try if that makes a difference as soon as I can. Furthe

Re: [Repeater-Builder] Re: Duplexer notch blurred - why?

Did you terminate the open port in 50 ohms? I've seen a similar trace where the port is left open. lh On Wed, May 19, 2010 at 10:29 PM, Walter H wrote: > > > The duplexor referenced is shown at: > > > > The author's spec a screen

[Repeater-Builder] Re: Duplexer notch blurred - why?

The duplexor referenced is shown at: The author's spec a screen shots only show 60-65 dB of notch. And he doesn't make critical length cables. WalterH --- In Repeater-Builder@yahoogroups.com, Larry Horlick wrote: > > -62 does s

[Repeater-Builder] Re: Duplexer notch blurred - why?

Your pic shows the classic signs of an incorrect cable length. Did you include the effective length of the coupling loops in your calculations? Our rule of thumb is that they are 1/10th wavelength. Otherwise, do what EMR does and try cable lengths until it meets specs. WalterH --- In Repeater-B

[Repeater-Builder] Re: Duplexer parts

> Gary Hoff wrote: > Sorry Skipp, never got that request, sometimes I think > not all the emails to this group end up getting forwarded to > me. If you've followed the thread you know I did order one > that is not quite exact but should work. Thanks again > everyone for your help. > Gary - K7N

Re: [Repeater-Builder] Re: Duplexer parts

Sorry Skipp, never got that request, sometimes I think not all the emails to this group end up getting forwarded to me. If you've followed the thread you know I did order one that is not quite exact but should work. Thanks again everyone for your help. Gary - K7NEY On 4/17/2010 5:52 PM, skipp02

[Repeater-Builder] Re: Duplexer parts

> Joe wrote: > I don't know if this was suggested, but you can buy a > cap of larger value that physically fits the area and > then remove a plate/stator or two to get the proper value. > > Removing a plate and/or stator is a trick from way back > in ham time when people scrounged parts and ma

Re: [Repeater-Builder] Re: Duplexer parts

and make one requires some manual skill and patience though To: Repeater-Builder@yahoogroups.com From: k7ney...@q.com Date: Fri, 16 Apr 2010 06:49:25 -0600 Subject: Re: [Repeater-Builder] Re: Duplexer parts Thanks, I se

RE: [Repeater-Builder] Re: Duplexer parts

Of course you can make one , some toy car parts and some copper clad pc board I have made quite a few and the calculations are easy To: Repeater-Builder@yahoogroups.com From: k7ney...@q.com Date: Fri, 16 Apr 2010 22:56:49 -0600 Subject: Re: [Repeater-Builder] Re: Duplexer parts

Re: [Repeater-Builder] Re: Duplexer parts

nual skill and patience though To: Repeater-Builder@yahoogroups.com From: k7ney...@q.com Date: Fri, 16 Apr 2010 06:49:25 -0600 Subject: Re: [Repeater-Builder] Re: Duplexer parts Thanks, I sent them an email and they said they haven't sold that

RE: [Repeater-Builder] Re: Duplexer parts

If all else fails it should be simple to work out the requirements and make one requires some manual skill and patience though To: Repeater-Builder@yahoogroups.com From: k7ney...@q.com Date: Fri, 16 Apr 2010 06:49:25 -0600 Subject: Re: [Repeater-Builder] Re: Duplexer parts

[Repeater-Builder] Re: Duplexer Capacitor Parts

> Gary Hoff wrote: > Thanks, I sent them an email and they said they haven't > sold that capacitor in 25 years and all spec sheets, etc > are all gone. Was worth a try though. I'll keep looking > Gary Try: http://www.cardwellcondenser.com/PAGES/jcm167series.html > On 4/15/2010 4:28 PM,

Re: [Repeater-Builder] Re: Duplexer parts

Thanks, I sent them an email and they said they haven't sold that capacitor in 25 years and all spec sheets, etc are all gone. Was worth a try though. I'll keep looking Gary On 4/15/2010 4:28 PM, ac6vj wrote: Gary, Try Viking Technologies LTD. at www.cardwellcondenser.com they have a very

[Repeater-Builder] Re: Duplexer parts (capacitor)

Email me direct a few very well lighted pictures of the capacitor and put something near it as a size reference (like a dime or a quarter [two-bits]). I've heard a story that hams have been known to have parts like these in their "junk box" (aka spare parts bin). skipp --- In Repeater-Buil

[Repeater-Builder] Re: Duplexer parts

Gary, Try Viking Technologies LTD. at www.cardwellcondenser.com they have a very large selection of Johnson, series 167 capacitors and will be able to give you the exact specifications on the broken one that you have. Gregory AC6VJ --- In Repeater-Builder@yahoogroups.com, Gary Hoff wrote: >

[Repeater-Builder] Re: Duplexer vs Split Level Antennas

I happen to have been at both ends of that site, the 900' level and the cabinets on the ground. As Jim says, this was in the early 70's. Configuration: 1000' tower with an inside "work" platform at 300, 600 and 900' (which were also the guy points - just 3 sets of guys! Yep, no elevator - manua

[Repeater-Builder] Re: Duplexer for TKR-720

I got the info today from TXRX, although it wasn't the identical duplexer. It did give me enough info to get it up and running... still a bit more attenuation than they spec, but it works pretty good. I was able to mount it inside the TKR-720 (minus power supply). Put three of the 'cans' under t

RE: [Repeater-Builder] Re: Duplexer vs Split Level Antennas

> Use to have SuperStation Masters with Rx at 450' and 150 > watts Tx at 240' many years ago on this tower before it got > moved. Had no desense and very good coverage. Will be running > WP-641 split. Just wondering about the Rx Tx vertical > separation. Would Rx at 450' and Tx at 375' be witho

[Repeater-Builder] Re: Duplexer vs Split Level Antennas

Use to have SuperStation Masters with Rx at 450' and 150 watts Tx at 240' many years ago on this tower before it got moved. Had no desense and very good coverage. Will be running WP-641 split. Just wondering about the Rx Tx vertical separation. Would Rx at 450' and Tx at 375' be without desense

[Repeater-Builder] Re: Duplexer vs Split Level Antennas

--- In Repeater-Builder@yahoogroups.com, "Jeff DePolo" wrote: >I would go for 2 antennas. Look at your set-up and determine the spaciing >needing along with some filters. Should be a great system. Wish I had some >tower access like that. Sid WA4VBC > > > Have chance to install a DB 224 at

[Repeater-Builder] Re: Duplexer vs Split Level Antennas

I take care of several repeaters both commercial and amateur. I would choose a two antenna system any day over a single antenna using a duplexer. Of the 7 ham repeaters that I assist with, only 2 use a single antenna and duplexer, and this is due to tower space limitations. My favorite way to d

[Repeater-Builder] Re: Duplexer for TKR-720

Thanks Skipp & Jeff, On the previous incarnation of the portable repeater, we were using a 'vari-notch' duplexer, and it worked quite well, although not quite small enough to fit inside the 720's box. I can fit 2 of the 5 cavities inside the space where the power supply was, but the other three j

[Repeater-Builder] Re: Duplexer for TKR-720

It's a great deal Jeff... Just everyone else reading this keep in mind these are wide split duplexers so you're not easily, if at all going to get them to perform with a 600KHz most of the USA standardized two-meter repeater offset. s. > "Jeff DePolo" wrote: > An oldie but a goodie, Sinc

RE: [Repeater-Builder] Re: Duplexer for TKR-720

> If you're patient on Ebay you can sometimes catch a deal on > this type of duplexer... Ebay Item Number: 110486323682 > I've caught these units used from prices of $50 up toward > $150 is a pretty good deal. > > back later... > s. An oldie but a goodie, Sinclair R2B12 for wide split (and

[Repeater-Builder] Re: Duplexer for TKR-720

Re: Duplexer for TKR-720 > "tahrens301" wrote: > Anybody have any experience with the duplexers in this > repeater? (I have the repeater, and was wondering if > it worth trying to find one, or go elsewhere). The VHF "flat pack" duplexers work fine for what they are. If you understand they will

Re: [Repeater-Builder] Re: Duplexer Cable Length / Recomendations

Trevor wrote: > And I thought this was a good place to get help - I guess it's just > like QRZ or hamsexy - A bunch of jackasses that have egos larger than > Motorola. > hmm-no wonder you don't get answers with that attitude.

Re: [Repeater-Builder] Re: Duplexer Cable Length / Recomendations

Trevor wrote: And I thought this was a good place to get help - I guess it's just like QRZ or hamsexy - A bunch of jackasses that have egos larger than Motorola. I'm sorry, the batteries went dead in our mind reading device earlier today, so we couldn't properly respond to the question(s) you

Re: [Repeater-Builder] Re: Duplexer Cable Length / Recomendations

The delete key is s underrated. Nathan N5REL Sent via BlackBerry by AT&T -Original Message- From: Trevor Date: Mon, 16 Feb 2009 00:51:33 To: Subject: [Repeater-Builder] Re: Duplexer Cable Length / Recomendations And I thought this was a good place to get help - I guess

Re: [Repeater-Builder] Re: Duplexer Cable Length / Recomendations

Yes Trevor, you have stumbled across a group of 4334 jackasses. Please do yourself a favor and leave us. Save yourself before you become one of us!! Joe Trevor wrote: > And I thought this was a good place to get help - I guess it's just > like QRZ or hamsexy - A bunch of jackasses that have e

Re: [Repeater-Builder] Re: Duplexer Cable Length / Recomendations

At 16:51 2/15/2009, Trevor wrote: >And I thought this was a good place to get help - I guess it's just >like QRZ or hamsexy - A bunch of jackasses that have egos larger than >Motorola. Hey, Trev, don't let the door hit your butt on the way out. -- Dave Gomberg, San Francisco NE5EE go

[Repeater-Builder] Re: Duplexer Cable Length / Recomendations

And I thought this was a good place to get help - I guess it's just like QRZ or hamsexy - A bunch of jackasses that have egos larger than Motorola. --- In Repeater-Builder@yahoogroups.com, Kevin Custer wrote: > > Trevor, > > A few comments, as the List Owner. > > First, you didn't ask what is/w

Re: [Repeater-Builder] Re: Duplexer Information Needed

At 2/11/2009 04:11, you wrote: >I take it by tuning you mean just adjusting the screws, and not adding >or changing anything to them? Yes. Bob NO6B

[Repeater-Builder] Re: Duplexer Information Needed

I take it by tuning you mean just adjusting the screws, and not adding or changing anything to them? --- In Repeater-Builder@yahoogroups.com, n...@... wrote: > > At 2/10/2009 17:31, you wrote: > >Lou, > > > >I doubt that you can use this band-reject (notch) duplexer at 70 cm without > >factory r

[Repeater-Builder] Re: duplexer

Bill, I tried tuning the 522-509 UHF duplexer and do not think I am getting the isolation I will need. It is a strang one. Do you have any specs on it??? Thanks again for the instructions. 73, ron, n9ee/r --- In Repeater-Builder@yahoogroups.com, "Bill Hudson" wrote: > > > > I just u

[Repeater-Builder] Re: duplexer

Bill, Thanks so much. Just what I needed. 73, ron, n9ee/r --- In Repeater-Builder@yahoogroups.com, "Bill Hudson" wrote: > > > > I just uploaded the manual for the > > > application/pdf > > PD-522-509.pdf >

[Repeater-Builder] Re: Duplexer help

thank you for the info. --- In Repeater-Builder@yahoogroups.com, "nj902" <[EMAIL PROTECTED]> wrote: > > The DB4003 is a three cavity bandpass duplexer with a specified > operating range of 148 to 174 MHz and a TX to RX separation of 5 MHz > or more. > > With 30 dB of suppression in the one cavi

[Repeater-Builder] Re: Duplexer help

The DB4003 is a three cavity bandpass duplexer with a specified operating range of 148 to 174 MHz and a TX to RX separation of 5 MHz or more. With 30 dB of suppression in the one cavity branch and 50 dB of suppression in the two cavity branch, even at five MHz of separation, this unit would pr

RE: [Repeater-Builder] Re: Duplexer isolation/Antenna separation

:31 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Duplexer isolation/Antenna separation George, I plugged in 25 watts at 462.500 MHz and 0.35 uV at 467.500 MHz, and got 67.83 dB of isolation needed, which could be provided by 30 feet of vertical antenna separation

RE: [Repeater-Builder] Re: Duplexer isolation/Antenna separation

here: 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of George Henry Sent: Sunday, August 31, 2008 12:55 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Duplexer isolation/Antenna separation

[Repeater-Builder] Re: Duplexer isolation/Antenna separation

What does CommShop say would be needed for a 25-watt GMRS repeater (5 MHz split) with 0.35 uV RX sensitivity? George, KA3HSW / WQGJ413 - Original Message - From: "Eric Lemmon" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: Sent: Saturday, August 30, 2008 1:52 PM Subject: [Repeater-B

[Repeater-Builder] Re: Duplexer Source.....

The Wacom duplexers are very good! --- In Repeater-Builder@yahoogroups.com, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > > Don, I have 2 Wacom duplexers used but in excellent shape. One is a WP-639 (2 meter) and a WP-652A (220). Also have 3 TX-RX new in original boxes models 28-37-11E (6 can 2

[Repeater-Builder] Re: Duplexer Source.....

I agree, I have had very good luck with TX-RX --- In Repeater-Builder@yahoogroups.com, "KD4PBC" <[EMAIL PROTECTED]> wrote: > > You can't beat TX-RX systems. www.txrx.com > > Custom made just for you . > > Robert / KD4PBC > > -Original Message- > From: Repeater-Builder@yahoogroups.com >

[Repeater-Builder] Re: Duplexer Source.....

Don, I have 2 Wacom duplexers used in excellent condition. 1 WP-639 2 meter and 1 WP-652A 220. Also have 3 TX-RX new in original cartons. 1 28-37-11E 6 cavity 2 meter, 1 28-52-02A 220, and 1 28-52-04319-A 220. Also have 1 220 bandpass cavity 11-54-01(new). Will tune to your frequency. Anyone in

[Repeater-Builder] Re: Duplexer Source.....

My reply would depend on the application. Is the application for an Amateur 600KHz Repeater (typical) or a Commercial box with a nearly 5 MHz split. Available new and used equipment sources and costs change with the mentioned. cheers, s. > "Don Spivey" <[EMAIL PROTECTED]> wrote: > > Can any

[Repeater-Builder] Re: Duplexer cables

The cables AND the connector jack with the velocity factor figured in... and the internal probe/loop length most of the time figured in free-space. The lengths change with the different type of installed duplexer probes/loops. No free lunch. s. As an example... a Telewave TPRD-1454 I have

RE: [Repeater-Builder] Re: Duplexer Tuning / Desense

@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Saturday, July 19, 2008 7:48 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Duplexer Tuning / Desense Mike, If you need some I may have a short piece of good MIL RG-214 you can have. I

Re: [Repeater-Builder] Re: Duplexer Tuning / Desense

at, 19 Jul 2008 12:39 pm Subject: RE: [Repeater-Builder] Re: Duplexer Tuning / Desense No room for Superflex in the repeater cabinet, and the RG-214 is MILSPEC, which is silver shield.   Mike WM4B   From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Laryn

RE: [Repeater-Builder] Re: Duplexer Tuning / Desense

Ick! From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of wd8chl Sent: Saturday, July 19, 2008 2:52 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Duplexer Tuning / Desense [EMAIL PROTECTED] <mailto:no6b%40no6b.com> wrote: &

Re: [Repeater-Builder] Re: Duplexer Tuning / Desense

[EMAIL PROTECTED] wrote: > At 09:41 AM 7/19/2008, you wrote: > >> I have seen at least one clearly demonstrated case where even >> adjacent hard-line runs have had excessive mutual energy coupling. >> >> Go figure... > > Not surprising at all, if the antennas they were connected to were poorly >

Re: [Repeater-Builder] Re: Duplexer Tuning / Desense

At 09:41 AM 7/19/2008, you wrote: >I have seen at least one clearly demonstrated case where even >adjacent hard-line runs have had excessive mutual energy coupling. > >Go figure... Not surprising at all, if the antennas they were connected to were poorly decoupled from the feedline shield, in wh

[Repeater-Builder] Re: Duplexer Tuning / Desense

Amen Paul, However, the owner is a Government Agency, very slow to both react and follow up with an adequate solution. When I was last involved with the project everyone was still pointing fingers at the other person. Rather than properly deal with the problem they simply relocated some of th

Re: [Repeater-Builder] Re: Duplexer Tuning / Desense

If adjacent hardlines have excessive mutual coupling, I'd look into decoupling RF currect flowing on the outside of the shields. - Original Message - From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Saturday, July 19, 2008 10:41 AM Subject: [Repeater-Builde

RE: [Repeater-Builder] Re: Duplexer Tuning / Desense

eater-Builder] Re: Duplexer Tuning / Desense I have seen at least one clearly demonstrated case where even adjacent hard-line runs have had excessive mutual energy coupling. Go figure... As an optimist I hope for the best using the supplied cables. As a skeptic I'm pleasantly

[Repeater-Builder] Re: Duplexer Tuning / Desense

I have seen at least one clearly demonstrated case where even adjacent hard-line runs have had excessive mutual energy coupling. Go figure... As an optimist I hope for the best using the supplied cables. As a skeptic I'm pleasantly surprised when the supplied cables work as descri

RE: [Repeater-Builder] Re: Duplexer Tuning / Desense

: [Repeater-Builder] Re: Duplexer Tuning / Desense --- In Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> , Jim Brown <[EMAIL PROTECTED]> wrote: > > Mike, that RG-8X is the first thing I would get rid of. It is typically only %95 covered in shield braid,

RE: [Repeater-Builder] Re: Duplexer Tuning / Desense (DB-4060)

Whoops. didn't read far enough down! 1) 26 watts 2) 1.5 dB 3) No 4) 146.25/85 From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: Saturday, July 19, 2008 12:06 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Bu

[Repeater-Builder] Re: Duplexer Tuning / Desense

--- In Repeater-Builder@yahoogroups.com, Jim Brown <[EMAIL PROTECTED]> wrote: > > Mike, that RG-8X is the first thing I would get rid of. It is typically only %95 covered in shield braid, and that is a path for a lot of leakage. > > The rule of thumb in the whole repeater cabinet is double shield

[Repeater-Builder] Re: Duplexer Tuning / Desense (DB-4060)

You didn't answer all the "big questions". I saw in another post the Tx value of 26 watts into the duplexer. List items 2, 3 & 4 are pretty big answer clues sources. your turn, s. The reply... > "Mike Besemer \(WM4B\)" <[EMAIL PROTECTED]> wrote: > No preamp. > Yes. the receiver was aligned

RE: [Repeater-Builder] Re: Duplexer Tuning / Desense (DB-4060)

. From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: Saturday, July 19, 2008 1:28 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Duplexer Tuning / Desense (DB-4060) Preamp on the Receiver? Was the Receiver front-end aligned

[Repeater-Builder] Re: Duplexer Tuning / Desense (DB-4060)

Preamp on the Receiver? Was the Receiver front-end aligned on the specific new frequency? Specific Receiver Model? Were the transmitter and any power amplifiers properly aligned? [The big questions...] Transmitter Power Output? Insertion loss setting on the duplexer probes? Were the duplexe

Re: Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

epeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope > >w6nct wrote: > >> The other (not-so-intuitive) part to this is that it is often >> difficult to do the tuning of a duplexer piece-meal; not impossible,

Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

w6nct wrote: > The other (not-so-intuitive) part to this is that it is often > difficult to do the tuning of a duplexer piece-meal; not impossible, > just difficult. What I mean by this is trying to tune one stage > (cavity), then another, then another; and combining it all together > into the ov

Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

Hi Darrell, Thanks for the info, try it one these good day, and let you know. v44kai.Joel. - Original Message - From: "jistabout" <[EMAIL PROTECTED]> Sent: Monday, June 23, 2008 3:13 AM Subject: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope -- -

Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

12:35:42 EDT >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope > >Hi Darrell, > >I've done it with an oscilloscope (slower than yours) and a >Sweep-Marker generator; but not with just the oscillo

[Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

Hi Darrell, I've done it with an oscilloscope (slower than yours) and a Sweep-Marker generator; but not with just the oscilloscope, signal generator and frequency counter. If I recall, the HP 8640B is also an RF Signal Generator; so if combined with an RF-detector and your oscilloscope and freq

Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

could help with a pre-amp on the scope. 73, ron, n9ee/r >From: jistabout <[EMAIL PROTECTED]> >Date: 2008/06/23 Mon AM 04:13:04 EDT >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope > >Hi Joel,

Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

Many years ago, I tuned up a set of 220Mhz homebrew duplexers with a 5Mhz scope. I built a 50 ohm load into an aluminum mini-box and placed a diode inside the box near the load. I then used the scope to detect the voltage developed by the diode as the power increased or decreased. This was a

Re: [Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

This would not be your typical audio frequency or 20 Mhz vertical bandwidth scope, I suppose, I have used a Bearcat programmable radio scanner and an FM10 for a generator to tune pass and reject. Steve NU5D jistabout wrote: > Hi Joel, > > > Well, setup is quite simple - For example, if tuning

[Repeater-Builder] Re: Duplexer tuning with an Oscilloscope

Hi Joel, Well, setup is quite simple - For example, if tuning a complete pass/notch type of duplexer, I connect the output of the signal generator to the antenna port of the duplexer. I then connect the scope to whichever side of the duplexer I'm currently tuning, and I also connect a 50-ohm

[Repeater-Builder] Re: Duplexer Cabinets

All the cabinets are spoken for. I may have a few more next month. Dwayne Kincaid WD8OYG > > Southern Maryland. > > > At 02:13 AM 2/10/2008, you wrote: > >At 12:32 PM 02/09/08, you wrote: > > >Hi all, > > > > > >I have a couple of duplexer cabinets if anyone is looking for those. No > > >duple

[Repeater-Builder] Re: Duplexer

Any of the Sinclair Q2xxx (not Q202) would work. Could use two or three. Thanks, Dwayne WD8OYG > > what kind are you looking for? > > thanks John > >

Active & passive devices (was Re: Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and r)

At 10/25/2007 04:36, you wrote: >According to Wikipedia a transistor is not active. Here they state active >devices as suppling power and passive as not. Rather than take selected sentences out of context, why not provide the link to the whole topic: http://en.wikipedia.org/wiki/Active_compone

Re: Re: RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation a

At 10/25/2007 04:23, you wrote: >bob, > >I guess you cannot grasp the difference between operation of a diode and >capacitor. A cap has it properties no matter what. ...and a diode has it's properties no matter what. Well, unless it gets zapped. Then again, a capacitor can be destroyed by exc

RE: [Repeater-Builder] Re: duplexer isolation and receiver noise bud

itters in a combiner. 73 Gary K4FMX > -Original Message- > From: Repeater-Builder@yahoogroups.com [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of DCFluX > Sent: Thursday, October 25, 2007 10:40 AM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder

[Repeater-Builder] Re: duplexer isolation and reciever noise budget

Hello Jeff, Never did the tests personally but I know from others work where I used to work that putting 2 RF signals through an isolator of significant power will produce measurable intermods and with the powers of a typical transmitter, definitely a problem. There were problems with just the co

Re: [Repeater-Builder] Re: duplexer isolation and receiver noise bud

Single isolators are meant for transmitter protection from reflected power and antenna failure and low end transmitter combiners. Dual stage is more tailored for intermod reduction and wide bandwidth low distortion (TV) applications. Triple stage is more tailored for a close spaced high power sin

Re: [Repeater-Builder] Re: duplexer isolation and receiver noise bud

Can't an isolator do both, provide a constant 50 Ohm load to the transmitter, and offer 30 (single junction) to 60 (dual junction) of isolation from signals travelling from the antenna to the transmitter for mixing. If isolators were just to provide a constant load, why are there dual junction

Re: RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and re

59 CDT >To: Repeater-Builder@yahoogroups.com >Subject: RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation >and reciev > >> Beta is the current gain of a transistor, HFE and Hfe. > >Finally something we can agree on. But the way you used "be

Re: Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and r

At 05:36 AM 10/25/2007, you wrote: >According to Wikipedia a transistor is not active. Here they state >active devices as suppling power and passive as not. For God's sake, guys,I don't think I have seen a more childish exchange on here ... nyah, nyah, nyah ... yes it is, no it isn't, yes it

Re: Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and r

I've worked with a bunch from BS to PHDs, consider a diode as an active device. 73, ron, n9ee/r >From: [EMAIL PROTECTED] >Date: 2007/10/24 Wed PM 10:45:20 CDT >To: Repeater-Builder@yahoogroups.com >Subject: Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer >isolation

Re: Re: RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation a

Repeater-Builder@yahoogroups.com >Subject: Re: RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer >isolation and re > >At 10/24/2007 10:55, you wrote: > >>Gary, >> >>Might be correct about a light bulb. Some would say it is active, hi. &g

Re: [Repeater-Builder] Re: duplexer isolation and reciev

Even magnetic amplifiers and tunnel diodes.. [EMAIL PROTECTED] wrote: > At 10/24/2007 19:26, you wrote: > > >> I would consider anything that uses a semi-condutor material to be >> active, Silicon and Germanium transistors included. >> > > According to Wikipedia, a passive device is a

Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciev

Wikipedia is only as good as the person writing the entry. Who here thinks a varactor tripler is not active? Sure, it's not that efficent, but 10W of UHF to make 3W of 1.2GHz is a pretty impressive feat. On 10/24/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > At 10/24/2007 19:26, you wrote: >

Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciev

At 10/24/2007 19:26, you wrote: >I would consider anything that uses a semi-condutor material to be >active, Silicon and Germanium transistors included. According to Wikipedia, a passive device is a device that is not capable of power gain. If it is capable of power gain, it is an active device

Re: [Repeater-Builder] Re: duplexer isolation and reciever noise budget

At 10/24/2007 19:46, you wrote: >145.25 can be a real pain. We have a repeater on that frequency. It is CATV >channel E. We always have leaks from the cable rendering the repeater >useless in some areas until a call is made to the CATV plant. They go out >and tighten the screws on an amplifier (le

Re: RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and re

At 10/24/2007 10:55, you wrote: >Gary, > >Might be correct about a light bulb. Some would say it is active, hi. >However, its material is not changed, just heated up. The amp meter does >not change its parameters, just reacts to a signal similar to an inductor. > >A diode's atoms change and reac

RE: [Repeater-Builder] Re: duplexer isolation and reciever noise bud

At 10/24/2007 10:08, you wrote: >At 10:10 AM 10/23/2007, you wrote: > > >No, it's not linear. First off, it doesn't satisfy the superposition > >principle since it will produce harmonic when fed by a pure sinusoid carrier > >(hopefully we can agree to that without added discussion), so right off t

Re: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciev

I would consider anything that uses a semi-condutor material to be active, Silicon and Germanium transistors included. On 10/24/07, Jeff DePolo <[EMAIL PROTECTED]> wrote: > > Beta is the current gain of a transistor, HFE and Hfe. > > Finally something we can agree on. But the way you used "beta"

RE: RE: RE: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciev

> Beta is the current gain of a transistor, HFE and Hfe. Finally something we can agree on. But the way you used "beta" was referring to the net gain of a *circuit* using a transistor in emitter-follower configuration, which I don't think is the correct use for the term, and which is why I put "

RE: [Repeater-Builder] Re: duplexer isolation and reciever noise

> You have to read carefully -- I said "capable" of gain. Not > "designed into the circuit in such a way that they EXHIBIT gain". Thank you. I can tune an otherwise-functional transmitter such that it takes in several kW of DC power and gives me practically zero RF output. That doesn't make the

RE: [Repeater-Builder] Re: duplexer isolation and reciever noise bud

We had a 1500 watt 70 MHz circulator go bad. I disassembled it to see what failed. IIRC there were 9 capacitors and at least 3 inductors along with the ferrite ant tuning magnets. Really makes a TV transmitter quit when the circulator between driver and final fails. Quite a site to see the capa

RE: [Repeater-Builder] Re: duplexer isolation and reciever noise budget

> Again, the circulator will produce intermod when external strong > signals enter the antenna port when used as a switch for the duplexer > and there is transmitter power also going through it. 50 Watts or > 47dBm to -116dBm receiver sensitivity is 163dBm dynamic range. The > device is not linear

Re: [Repeater-Builder] Re: duplexer isolation and reciever noise budget

145.25 can be a real pain. We have a repeater on that frequency. It is CATV channel E. We always have leaks from the cable rendering the repeater useless in some areas until a call is made to the CATV plant. They go out and tighten the screws on an amplifier (left loose by the last tech working

[Repeater-Builder] Re: duplexer isolation and reciever noise budget

I was referring to using the circulator in place of the T connector in a duplexer that was being discussed in earlier threads. An isolator is a circulator with a load on one of the ports. Again, the circulator will produce intermod when external strong signals enter the antenna port when used as

Re: Re: [Repeater-Builder] Re: duplexer isolation and reciever noise

Nate, Ok, 73, ron, n9ee/r From: Nate Duehr <[EMAIL PROTECTED]> >Date: 2007/10/24 Wed AM 10:25:31 CDT >To: Repeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] Re: duplexer isolation and reciever noise > > >On Oct 24, 2007, at 5:56 AM, R

  1   2   3   4   >