Re: [Repeater-Builder] Spectrum Analyzer

Mike, Your question is an excellent one! It is true that most duplexers can be tuned to the 90% level using relatively crude methods. It may also be true that repeaters using a duplexer tuned with relatively crude methods may work just fine in non-demanding applications. In order to squeeze ou

Re: [Repeater-Builder] Duplexer Loss Question

Mathew, A 1.5 dB insertion loss will result is an output that is 0.708 of the input. For 150 watts input, this would result in about 106 watts output. A lot of assumptions are made in arriving at this ballpark figure! First of all, your PA output into a 50 ohm resistive load is not going to be

Re: [Repeater-Builder] Duplexer Loss Question

Hmm  I just  hooked up a set of cans over here, and  they were tuned for my freq used them b4 well 2 year a ago.. and I tested the antenna with 75watts direct from a radio and bird inline nothing else..   hooked up the duplexer and repeater (75w) and check the SWR was a crankin + 5: so I c

Re: [Repeater-Builder] Duplexer Loss Question

Check your transmitter for spurious signals... much of your power might not be on the freq. you think it is...Also check the reflected power at the TX port, this can be an indication if the cavities are tuned correctly.  lance - Original Message - From: Mathew Quaife T

Re: [Repeater-Builder] Duplexer Loss Question

Thanks Mike, well I wanted to make sure that I was not loosing the ability to do basic math, but for some reason I had the duplexers retuned and whenI dumped 200 watts into them, I got only 65 to 70 back out of them.  Trying to figure what when wrong in the process.   Mathew Mike Morris WA6ILQ <

Re: [Repeater-Builder] Duplexer Loss Question

Thanks, this is what I came up with, not I can say something is wrong.  I put 200 in and get 65 to 70 watts out.  Now to figure out why.  These were tuned for me, I was not there when they was tuned, so I am not sure what was done.  They were moved from 156.925/325 to 154.410/810.  And no, I am

RE: [Repeater-Builder] Glasses - was "Re: Setting dual squelch levels:

Interesting... I just might give it a try. I've only had these stupid things for a couple of weeks. Of course, the military does things backwards. They had me pick my frames, THEN told me I needed bifocals this time. If I'd have known I was getting bifocals, I'd have opted for a larger lens!

RE: [Repeater-Builder] Re: Setting dual squelch levels

Oh goodie... something else for my tiny little brain to keep track of! So... aside from changing names more often then some people change their underwear, how's their reputation. (Okay... I realize that NOW is a heck of a time to ask, but I wasn't around when the equipment was purchased!) -- de

RE: [Repeater-Builder] 1-5/8" Coax For Sale Middle Tennessee

And I have four (4) CellWave cold-shrink kits for 1-5/8" to Type N (1/2"). Not looking to get rich.. just looking to get them out of the shack... were purchased for an EME project. They are excess to my needs, and I am willing to make a good deal here before offering them to the masses on eBay. e

Re: [Repeater-Builder] Duplexer Loss Question

At 10:59 AM 3/22/05, you wrote: >I am curious with a set of TX-RX duplexers at 1.5 insertion loss, >input power of 150 watts, what would be the power output? Need to >know, as I don't think they are tuned correctly, or something might >be wrong here. > >Mathew See

Re: [Repeater-Builder] Re: Setting dual squelch levels

At 09:33 AM 3/22/05, you wrote: >Mike - WM4B wrote: > > > I've gotta start wearing my bifocals! > > > > That SHOULD read KRP-5000! > > > > Thanks, Jim! > >Still never heard of it-who's ACS? >-- >Jim Barbour >WD8CHL Micro Control Specialties / Kendecom / Advanced Communication Systems are all the

Re: [Repeater-Builder] Glasses - was "Re: Setting dual squelch levels:

You too? If you actually wear bifocals while you are using your computer, then do yourself a favor - next time you have glasses made, have them make you a bifocal pair IN REVERSE ! i.e. the small lens is the distance cut and at the top, the big lens is the proper cut for your use of the screen,

Re: [Repeater-Builder] Spectrum Analyzer; Tuning & Peaking

If the tracking generator & spectrum analyzer (service monitor) equipment is available, that is the way to go. There is no substitute for having a visual representation for what is happening while the tuning is being done. Late last year I decided to tweak up the AA4VU UHF repeater using an IFR

Re: [Repeater-Builder] Spectrum Analyzer

I used to tune them that way also, and thought I did well, but after I got access to a Spectrum Analyzer with tracking generator, I find it much easier and more accurate.  Maybe because the pattern is visual when you are tuning with the tracking generator and analyzer.  I've taken duplexer

Re: [Repeater-Builder] Duplexer Loss Question

db = 10 Log(P-out / P in) According to my slide rule, P out / P in would be about .707 for 1.5 db .707 X 150 = 106 watts Somebody correct me if I'm wrong. Gary - K7NEY - Original Message - From: "w9mwq" <[EMAIL PROTECTED]> To: Sent: Tuesday, March 22, 2005 11:59 AM Subject: [Repe

Re: [Repeater-Builder] Duplexer Loss Question

1.5 dB is 29%. Take 150, less 29%, and you get 106.5 watts. Kevin w9mwq wrote: >I am curious with a set of TX-RX duplexers at 1.5 insertion loss, >input power of 150 watts, what would be the power output? Need to >know, as I don't think they are tuned correctly, or something might >be wron

Re: [Repeater-Builder] 1-5/8" Coax For Sale Middle Tennessee

And I have one new in the package 1 and 5/8 ths to N connector that I would like to sell. NØATH at Charter dot net Dave - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Tuesday, March 22, 2005 1:24 PM Subject: [Repeater-Builder] 1-5/8" Coax For Sale Middle Tennessee Greeti

[Repeater-Builder] Re: Setting dual squelch levels

No... I don't think so. We've never heard anything on the input (it's been monitored all over town) and some dude would have to be SERIOUSLY bored to kerchunk that bad! Although it's normally worse in the morning, it's been known to occur at all times of the day and night... and on occasion

[Repeater-Builder] Re: Better RX with feedline partailly disconnected?

No problama, The early Hamtronics and VHF Engineering Receivers just won't live very happy in repeater service without some additional front end protection. The early model Hamtronics Receiver might be something like an R51 or some number like that. I probably have diagrams for it somewher

Re: [Repeater-Builder] Spectrum Analyzer

Mel Farrer wrote: > In my experience, using a tracking generator and spectrum analyser > works fine on "realitively" modest Q circuits. The swept response > display picture, is however a function of the detector response and > the sweep speed of the generator. That is, the detector display w

[Repeater-Builder] Re: Setting dual squelch levels

--- In Repeater-Builder@yahoogroups.com, "Mike - WM4B" <[EMAIL PROTECTED]> wrote: > > Laryn, > > Once the repeater is up and there is no carrier present (i.e. after > an ID, or after the user drops his carrier), the repeater will issue > the reset beep, then there will be a brief burst of noi

Re: [Repeater-Builder] Re: Setting dual squelch levels

Mike - WM4B wrote: > > Advanced Communication Systems (http://www.advcommsys.com/) oh-kendecom... -- 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

Re: [Repeater-Builder] Spectrum Analyzer

In my experience, using a tracking generator and spectrum analyser works fine on "realitively" modest Q circuits.  The swept response display picture, is however a function of the detector response and the sweep speed of the generator.  That is, the detector display will be deeper as the sweep s

[Repeater-Builder] 1-5/8" Coax For Sale Middle Tennessee

Greetings, I have several hundred feet of 1-5/8" coax with foam dielectric for sale. The coax is removed from cellular service & in good condition. The manufacturer is Radio Frequency Systems (RFS), or perhaps more widely known as Celwave. There are some shield grounding straps included near

Re: [Repeater-Builder] Re: Setting dual squelch levels

Sounds like noise from the controller getting into the RX. Joe M. Mike - WM4B wrote: > > Laryn, > > Once the repeater is up and there is no carrier present (i.e. after > an ID, or after the user drops his carrier), the repeater will issue > the reset beep, then there will be a brief burst of n

Re: [Repeater-Builder] Desense im guessing?

Most of the amplifiers such as the ARR (Advanced Receiver Research) are over kill on the amplifier gain i.e. 24 db, however the Motorola RF preamplifier, Models TLD8421B and TLD8422B have only a 10 db gain. The latter has a two stage aperture coupled helical resonator and a tuned output stage

[Repeater-Builder] Duplexer Loss Question

I am curious with a set of TX-RX duplexers at 1.5 insertion loss, input power of 150 watts, what would be the power output? Need to know, as I don't think they are tuned correctly, or something might be wrong here. Mathew Yahoo! Groups Links <*> To visit your group on the web, go

Re: [Repeater-Builder] Re: Better RX with feedline partailly disconnected?

Thanks Skipp. We had just gotten the duplexer back from tx/rx so I am going to assume it is not a problem with the cans. Especially since it was doing the exact same thing before they went through them. The owner just ordered a new synth receiver from Hamtronics so we will soon see if it w

[Repeater-Builder] Re: Setting dual squelch levels

Advanced Communication Systems (http://www.advcommsys.com/) --- In Repeater-Builder@yahoogroups.com, "Jim B." <[EMAIL PROTECTED]> wrote: > Mike - WM4B wrote: > > > > > I've gotta start wearing my bifocals! > > > > That SHOULD read KRP-5000! > > > > Thanks, Jim! > > Still never heard of it

[Repeater-Builder] Re: Better RX with feedline partailly disconnected?

Hello back, A lot of things could be playing into this but I do feel you need to add the helical front end to the early Hamtronics Receiver to make it play properly in repeater service. Especially with power levels in excess of 5 watts. Onward... I've had problems with pitted cavity tune

[Repeater-Builder] Spectrum Analyzer

I have always tuned duplexers just using a signal generator and a radio receiver. Peaking the passband and then going for the deepest notch for the reject. Although this seems to work, the results haven't been spectacular. I realize that there are many variables to consider. My question is

Re: [Repeater-Builder] Re: Setting dual squelch levels

Mike - WM4B wrote: > > I've gotta start wearing my bifocals! > > That SHOULD read KRP-5000! > > Thanks, Jim! Still never heard of it-who's ACS? -- Jim Barbour WD8CHL Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <

Re: [Repeater-Builder] Re: Better RX with feedline partailly disconnected?

I am running the service monitor into the duplexer, not an antenna. I don't see how desense could be the problem with the tx off and a service monitor for a source. I am using the monitor for a source and going thru the duplexer and testing, then bypassing the duplexer. Through the duplexe

[Repeater-Builder] Re: Better RX with feedline partailly disconnected?

> "Michael Singewald N1PLH" <[EMAIL PROTECTED]> wrote: > 220 Hamtronics receiver (very old, no labeling on > the board). The early receivers don't have a very selective or dynamic rf front end. Blocking and desense is a common problem with the early type less protected receiver front end c

[Repeater-Builder] Re: Sinclair Q-322D Duplexer

Hi, Eric; Ya had me going, so I grabbed the cheaters and went out to the garage to double check the ID plate. It is really a Q-322D (Delta). Nice thought, though. Thanks---Dick---N7ZH --- In Repeater-Builder@yahoogroups.com, Eric Lemmon <[EMAIL PROTECTED]> wrote: > Please confirm the mode

Re: [Repeater-Builder] Desense, I'm guessing?

Kevin, Eric and all the WP-643's work great. And I dont even have the preamp installed and since i am happy with the performace with out the preamp and and the tx to rx range is about equal. It is locked Down and covers on. Thanks 6 8" cans are the way to go. - Original Message - From: "K

[Repeater-Builder] Re: Desense im guessing?

The WP-641 works fine on our repeater. 100W MASTR II running about 75 into the duplexer, with a Lunar GAsfet on receive. YMMV---Dick---N7ZH > Not enough duplexer. > For a 50 to 100 watt Station with a receiver preamp you should have *at > least* a WP-641, and that may not be enough unless

Re: [Repeater-Builder] Better RX with feedline partailly disconnected?

Just for the sake of being nuts, make sure you don't have a floating voltage lying around.  When I first began working with the repeater, I had something similiar, found that it was a stray voltage to ground.  Changed the power source coming in and that fixed the problem.  Turned out to be a gro

[Repeater-Builder] Re: Setting dual squelch levels

I've gotta start wearing my bifocals! That SHOULD read KRP-5000! Thanks, Jim! --- In Repeater-Builder@yahoogroups.com, "Jim B." <[EMAIL PROTECTED]> wrote: > Mike - WM4B wrote: > > > > > Tony, > > > > It's an ACS KPR-6000 machine > > Now there's one I never heard of before...??? > > --

[Repeater-Builder] Re: Setting dual squelch levels

Laryn, Once the repeater is up and there is no carrier present (i.e. after an ID, or after the user drops his carrier), the repeater will issue the reset beep, then there will be a brief burst of noise (we can never hear any audio/data on it, but it's really too short of a busrt to tell), th

Re: [Repeater-Builder] Re: Setting dual squelch levels

Mike - WM4B wrote: > > Tony, > > It's an ACS KPR-6000 machine Now there's one I never heard of before...??? -- 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, s

[Repeater-Builder] Re: Setting dual squelch levels

--- In Repeater-Builder@yahoogroups.com, "Mike - WM4B" <[EMAIL PROTECTED]> wrote: Sometimes it stops in 3 or 4 cycles, but I've heard it go on > for an hour or more. Mike, the comments above caught my eye. What do you mean by the word *cycles*? In this context, it reminds me of the cycling

Re: [Repeater-Builder] PC repeater controller

Kevin Berlen, K9HX wrote: > You might take a look at this: > > http://www.synergenics.com/sc/ > > I am not a user, but it looks interesting. 73, > > Kevin, K9HX > > At 12:46 AM 3/22/2005, you wrote: Have they fixed the CW yet? It always sputters and skips on any PC I've tried it on, even an

[Repeater-Builder] Re: Setting dual squelch levels

Tony, It's an ACS KPR-6000 machine running on 6.25/.85. The antenna is a 4- bay on top of a water tower... probably 200' AGL, on the north end of Warner Robins. It seems more frequent in the morning hours (0700 or so), but is very intermittant. I believe it happens more during wet weather

Re: [Repeater-Builder] PC repeater controller

Just an observation,the EchoStation software is buggy,DTMF decoding problems and sometimes locks up. YMMV. There is also the TCX150g which requires a PC card,but it is not currently in production. It is bugless.73,Lee,N3APP Kevin Berlen, K9HX wrote: >You might take a look at this: > >http://ww

Re: [Repeater-Builder] Desense, I'm guessing?

Eric Lemmon wrote: >For those who may not have the Wacom catalog handy, the WP-643 duplexer >comprises six 8" cavities that are rated at 102 dB isolation at 600 kHz >spacing, with 2.2 dB insertion loss. Four of the cavities are BpBr, and two >are >bandpass only. The WP-639 duplexer comprises

Re: [Repeater-Builder] Desense im guessing?

Actually, try somewhere between .5 and 2dB BEFORE the preamp, you might be surprised that effective sensitivity will go UP an d desense will go DOWN. Joe Dave Baughn <[EMAIL PROTECTED]> wrote: = Try adding a 10 dB pad AFTER the preamp. Should not affect sensitivity but may