RE: [Repeater-Builder] Advanced Receiver Research Preamp 144-148

2007-02-13 Thread Jeff DePolo
> Your math looks sound, Jeff, except I thought 1/2" Heliax > wasn't quite so > lossy @ 450 MHz (~1.5 dB/100 ft IIRC?). > >Scenario 1: Preamp = 0.5 dB NF, antenna feeding 200' of > 1/2" Heliax (3 > >dB loss @ 450 MHz @ 1:1 VSWR) 1.5 dB per 100 ft versus 3 dB for 200'. I think we're in agre

Re: [Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread Jim B.
ensemble953039 wrote: > > Hi, >from the experiments carried out here in the U.K. on in-band and >cross-band portable and mobile repeaters vertical separation is >nowhere near as good as horizontal.This also offers the chance >to get the recieve antenna in a "null" from the transmi

Re: [Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread no6b
At 2/12/2007 09:45, you wrote: >Hi, >from the experiments carried out here in the U.K. on in-band and >cross-band portable and mobile repeaters vertical separation is >nowhere near as good as horizontal.This also offers the chance >to get the recieve antenna in a "null" from the tr

[Repeater-Builder] Re: re Zetron circuit

2007-02-13 Thread n3gh_1
--- In Repeater-Builder@yahoogroups.com, Mike Morris <[EMAIL PROTECTED]> wrote: > > At 04:56 AM 02/12/07, you wrote: > >Peter, > >Thanks alot. > >I downloaded the manual from the Repeater Builders site but the > >pages that show the schematic are blank. Let me know > > > >N3GH > >George > > Unfor

[Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread covertp9
I would think you'd be best served by getting the duplexer ASAP. If your intent is to have a smaller, portable, quick to set up repeater... the duplexer allows you to eliminate one antenna & feedline, sets up more quickly, and works immediately without antenna jockeying, tuning, etc. (assuming you

RE: [Repeater-Builder] Advanced Receiver Research Preamp 144-148

2007-02-13 Thread no6b
At 2/13/2007 06:28, you wrote: > > Your math looks sound, Jeff, except I thought 1/2" Heliax > > wasn't quite so > > lossy @ 450 MHz (~1.5 dB/100 ft IIRC?). > > > >Scenario 1: Preamp = 0.5 dB NF, antenna feeding 200' of > > 1/2" Heliax (3 > > >dB loss @ 450 MHz @ 1:1 VSWR) > >1.5 dB per 100 ft ve

RE: [Repeater-Builder] Advanced Receiver Research Preamp 144-148

2007-02-13 Thread Ken Arck
At 08:36 AM 2/13/2007, you wrote: >If "Joe Ham" were serious about weak signal reception, he'd mount the >preamp at the antenna. Otherwise, 3 dB is already a lot of loss to >tolerate for weak signal work; what's another dB? <---Not just the loss but those 3 dB of feedline loss translate to an

[Repeater-Builder] Re: Astron Power Supply Failures

2007-02-13 Thread skipp025
I bought an import made battery load tester off ebay for under $10. The tester even has a meter indication. I added a small fan to move air through it and use it as a high current load where desired. Sometimes I use it as a series resistance. I also use heating elements out of dead hair drye

[Repeater-Builder] Re: Combining antennas.

2007-02-13 Thread skipp025
> Has anyone tried to combine DB224E & DB408 on the same > mast? Well yes... I'm doing it. They use the same mast but not the same feedline. If you needed to use a common feedline I would look at a commercial diplexer first... mostly for the higher power level capacity. I've used Comet and D

Re: [Repeater-Builder] Re: Astron Power Supply Failures

2007-02-13 Thread Bob M.
I wasn't sure if those load testers could be turned down low enough to only give me 25-30 amps. Are they just carbon sticks? Bob M. == --- skipp025 <[EMAIL PROTECTED]> wrote: > > I bought an import made battery load tester off ebay > for under > $10. The tester even has a meter indication.

RE: [Repeater-Builder] Re: Combining antennas.

2007-02-13 Thread Fred Flowers
Skipp, Thanks for the reply. As I stated, I need to maintain a low profile. There is a 2 meter & 7/8" line on the tower. The antenna is too high in frequency; therefore the return loss from the antenna is about 4dB. I have a DB-224E that I'm going to replace the one on the tower with. I also h

[Repeater-Builder] Re: Ok, here's a weird one....

2007-02-13 Thread Ken Arck
At 10:09 AM 2/13/2007, Ken Arck wrote: >Have a customer with the following issue: > >Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM >radio xmtr site.

[Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Ken Arck
Have a customer with the following issue: Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM radio xmtr site. Issue: Very low level audio of radio station appears on Mastr II's xmtr (yes, external controller). Repeater owner hasn't fully explained what "very low level" means. But

[Repeater-Builder] low cost battery load testers

2007-02-13 Thread skipp025
Nope, they are small metal strap/bar material formed to be resistors. I bought a number of battery load testers off ebay real cheap. Can't build them for the price I can buy new units. Our global "Wal Mart Economy". cheers, s. > "Bob M." <[EMAIL PROTECTED]> wrote: > I wasn't sure if those lo

Re: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Steve Bosshard \(NU5D\)
KOOV, Copperas Cove, Texas 1981 / Centel IMTS VHF M2 mobile telephone station - low level music on hold before it's time. Remove service microphone from M2 station - improve grounding - no magic. And this was only 1KW Continental transmitter - suspect non-linear detection in the M2 station.

Re: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Doug Bade
Ken; I have seen this with a lot less than 100 kw TX power In our case the repeater appeared to be in the near field of the FM broadcast antenna.. Most interference was coming in the phone line and on groundssheilding ground loop issues were also present on coaxial audio wiring

RE: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Jeff DePolo
> Question: The only way I see this happening is due to some AM > component on radio station's transmitter. > > Thoughts? Virtually all FM transmitters have some residual/undesirable AM components. If the AM follows the applied FM modulation, it's referred to as synchronous AM, and is usually ca

RE: [Repeater-Builder] Advanced Receiver Research Preamp 144-148

2007-02-13 Thread Jeff DePolo
> If "Joe Ham" were serious about weak signal reception, he'd mount the > preamp at the antenna. Otherwise, 3 dB is already a lot of loss to > tolerate for weak signal work; what's another dB? Us northeastern Joe Ham types don't like climbing the tower during the middle of the January contest w

Fwd: [Repeater-Builder] low cost battery load testers

2007-02-13 Thread cruising7388
In a message dated 2/13/2007 11:04:58 A.M. Pacific Standard Time, Cruising7388 writes: In a message dated 2/13/2007 10:28:27 A.M. Pacific Standard Time, [EMAIL PROTECTED] writes: > I bought an import made battery load tester off ebay > > for under > > $10. The tester even has a meter ind

[Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread ensemble953039
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > > At 2/12/2007 09:45, you wrote: > > >Hi, > >from the experiments carried out here in the U.K. on in-band and > >cross-band portable and mobile repeaters vertical separation is > >nowhere near as good as horizontal.Thi

[Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread Brian Rau
Thanks for your input, I was hoping to hear from someone who had experience with this kind of rig. I've been trying the vertical antenna separation tactic, which *in theory* puts the antennas in each others' nulls, but I think the reality is that there's enough pattern distortion, signal reflectio

[Repeater-Builder] Re: Ok, here's a weird one....

2007-02-13 Thread na6df
Can the FM stations audio be heard fairly clearly? If so, something in the repeater is demodulating it. If it were getting into the front end of the repeater it wouldn't be demodulated properly as the FM station is far too wide, usually at least plus/minus 75khz or more. Could be some semiconducto

RE: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Daron J. Wilson
* Question: The only way I see this happening is due to some AM > component on radio station's transmitter. > > Thoughts? I've got one site with similar problems. MastrII repeater, in a metal cabinet, grounded, bonded quite well. Shielded audio cables, ARCOM RC-210 controller (shameless plug

[Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread radiomog
how does this group run? I've getting posts out of sequence... the "here's a weird one.." (~) post showed quite a few responses before the actual post showed up. I'm on yahoo, and its a yahoo group. How does this work, and what would it take to see that messages show up in order and on a timely

RE: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Jamey Wright
Make sure all of the shields are in place on the MASTR II. We had one here on a Public Safety freq that was co-located with a 100 KW FM. Between the squirrels calling the MASTR II home and chewing on some of the wiring and some man-made wiring problems, it sounded like the person on the repeater

RE: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread Don KA9QJG
They will never be in Order, because everyone’s Internet Provider is Different and send things out that get bogged down. Now I know this was not a great Answer, I am not that Computer savvy, but someone on Here can explain it in More Tech terms without this Becoming into a big thread. Happy repe

RE: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Ken Arck
Thanks for all the comments folks. But I'm scratching my head a bit about this. In order to demodulate an FM modulated carrier, it takes more than simple RF rectification, which is all it would take to demodulate an AM modulated carrier. Ken -

Re: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread Bob M.
Welcome to Yahoo's lousy group and e-mail system. That's just the way it is. If you want it to be better, you'll have to take the service off of Yahoo and get a company that can do stuff properly to run it. I've posted messages on Friday and not seen them come back to me until Monday. I've seen

Re: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread Jim B.
radiomog wrote: > how does this group run? > > I've getting posts out of sequence... the "here's a weird one.." (~) > post showed quite a few responses before the actual post showed up. > I'm on yahoo, and its a yahoo group. How does this work, and what > would it take to see that messages show

Re: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread mch
A much faster internet with faster mail servers at YahooGroups. Joe M. radiomog wrote: > > and what > would it take to see that messages show up in order and on a timely > basis?

RE: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread Phil
I'm on yahoo via a T1 and I'm seeing your reply, but not my initial post. how would an ISP be the issue? Does this reflector not reside on Yahoo? Don KA9QJG <[EMAIL PROTECTED]> wrote: They will never be in Order, because everyone’s Internet Provider is Different and send thing

Re: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread STeve Andre'
On Tuesday 13 February 2007 14:51:42 mch wrote: > A much faster internet with faster mail servers at YahooGroups. > > Joe M. > > radiomog wrote: > > and what > > would it take to see that messages show up in order and on a timely > > basis? The situation is pretty complicated. There are a lot of

Re: [Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread Bob Dengler
At 2/13/2007 08:22 AM, you wrote: >Thanks for your input, I was hoping to hear from someone who had >experience with this kind of rig. I've been trying the vertical >antenna separation tactic, which *in theory* puts the antennas in each >others' nulls, but I think the reality is that there's enoug

Re: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread DCFluX
"A transmitter can be transmitting a FM carrier with a significant amount of incidental AM. It is pretty widely known that incidental AM is caused by unoptimized transmitting antennas and transmitters. The result can be both in-band and out-of-band spurious FM products. This can make stereo recepti

Re: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread mch
It's not unheard of for email to get 'lost in the mail', either. The speed of your connection is only one issue, and a minor one at that. Another issue nobody has mentioned so far is the fact that some people have their clocks set wrong. This can be ahead or behind - minutes, hours, months, or ev

Re: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Ken Arck
At 12:31 PM 2/13/2007, you wrote: >"A transmitter can be transmitting a FM carrier with a significant >amount of incidental AM. <---I didn't think there'd be enough incidental AM in a commercial broadcast xmtr to be a factor here but I guess I'm wrong. Thanks Ken ---

RE: [Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread John J. Raymond
Brian, I very familiar with those radios (small ICOM Land Mobile Dealer)… one solution is to try a small preselector on the receiver…. I have two F121s in the back of a fire dept rescue vehicle with antennas about 3 feet apart and it works fairly well. The FD has told me they can be several mile

[Repeater-Builder] Vertex VX-2000 Accessory Connector

2007-02-13 Thread Bob M.
Anyone have info regarding the DB-9 accessory connector on the back of these radios? I'd suspect that the VX2000, 3000, and 4000 series are similar. I've searched the web. Naturally there are no detailed photos or any info available from the Yaesu Vertex Standard (or whatever name they're using to

[Repeater-Builder] Re: Ok, here's a weird one....

2007-02-13 Thread crackedofn0de
--- In Repeater-Builder@yahoogroups.com, Ken Arck <[EMAIL PROTECTED]> wrote: > > Have a customer with the following issue: > > Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM radio > xmtr site. > > Issue: Very low level audio of radio station appears on Mastr II's > xmtr (yes, e

[Repeater-Builder] New file uploaded to Repeater-Builder

2007-02-13 Thread Repeater-Builder
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Repeater-Builder group. File: /vx2000conn.pdf Uploaded by : na6df <[EMAIL PROTECTED]> Description : vertex vx-2000 dsub 9 connector info.. You can access this fil

RE: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread Fred Flowers
I get the same thing. My email is Bellsouth, therefore I can't expect any better. Yahoo + Bellsouth = POS. Fred N4GER -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of radiomog Sent: Tuesday, February 13, 2007 1:31 PM To: Repeater-Builder@y

[Repeater-Builder] Re: Vertex VX-2000 Accessory Connector

2007-02-13 Thread na6df
go to this groups file section, I just posted a pdf from the manual of that connectors info. The radio itself is a db-9 female.. dave --- In Repeater-Builder@yahoogroups.com, "Bob M." <[EMAIL PROTECTED]> wrote: > > Anyone have info regarding the DB-9 accessory > connector on the back of these r

Re: [Repeater-Builder] Re: Vertex VX-2000 Accessory Connector

2007-02-13 Thread Bob M.
Perfect! Exactly what I needed to know, and then some. It answers a bunch of questions. No other replies/posts needed now. Thanks. Bob M. == --- na6df <[EMAIL PROTECTED]> wrote: > go to this groups file section, I just posted a pdf > from the manual of > that connectors info. The radio itse

Re: [Repeater-Builder] Re: Icom portable repeater help

2007-02-13 Thread Ralph Mowery
--- Brian Rau <[EMAIL PROTECTED]> wrote: > Thanks for your input, I was hoping to hear from > someone who had > experience with this kind of rig. I've been trying > the vertical > antenna separation tactic, which *in theory* puts > the antennas in each > others' nulls, but I think the reality is

[Repeater-Builder] Re: Vertex VX-2000 Accessory Connector

2007-02-13 Thread na6df
Yeah, I have a bunch of the vx2000's. I like the little boogers. The bummer is that the COS line is not programmable to operate with CTCSS. It is always a carrier indicator, even if the radio is in decode. If it were otherwise, I'd be using them for more IRLP and echolink projects. I use maxtracs a

Re: [Repeater-Builder] Re: Ok, here's a weird one....

2007-02-13 Thread DCFluX
Hell, I could spend a week on top of a mountain with an Oscilloscope, Spectrum Analyzer and function generator and still not trace down what is actually happening. Survey says: Incidental AM from a weak tube in the FM tranmitter final stage coupling to DC power leads as an antenna and then being

RE: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Mathew Quaife
Several years back our local radio station on 99.3 Mhz has a AM transmitter on 1520 Khz. They began to get into all the 49 Mhz phones, radios, as well as hitting some of the commercial frequencies in the aircraft and 150 megs. The tech went out, and after several days of trouble shooting, they

Re: [Repeater-Builder] posts showing up out of sequence

2007-02-13 Thread Mike Morris WA6ILQ
At 12:37 PM 02/13/07, you wrote: >It's not unheard of for email to get 'lost in the mail', either. > >The speed of your connection is only one issue, and a minor one at that. > >Another issue nobody has mentioned so far is the fact that some people >have their clocks set wrong. This can be ahead or

Re: [Repeater-Builder] Re: Vertex VX-2000 Accessory Connector

2007-02-13 Thread Bob M.
Thanks. That's good to know. Too bad they didn't come out with a signal that follows the CTCSS. Maybe you could find something like an audio enable signal that DOES follow coded squelch. That's what we use on MaxTracs. Bob M. == --- na6df <[EMAIL PROTECTED]> wrote: > Yeah, I have a bunch of t

Re: [SPAM] RE: [Repeater-Builder] Combining antennas.

2007-02-13 Thread Coy Hilton
You're right Fred. Andrew bought DB Products. But wait, DB Spectra does antennas and duplexers that DB Products used to do and that Andrew didn't want. DB Spectra is the company that used to manufacture the products like duplexers for DBP. --- In Repeater-Builder@yahoogroups.com, "Fred Flower

[Repeater-Builder] Re: Ok, here's a weird one....

2007-02-13 Thread numberone5call
Ken; I can only tell you what worked for myself and a friend w another repeater. Both repeaters were/are located on hi-power FM broadcast towers. Both FM broadcast radio transmissions cud barely be heard on the outputs of the repeaters (only when the rptrs were tx'n, under the tx audio). Both

Re: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread DCFluX
When the tubes get weak it becomes an issue. On a 1000 watt transmitter I have seen the power output needle swing between 80% and 100%, This would be 200 watts of AM. Of course that is after 21 months of non-stop FM (CW) service. Kinda like a stupid trucker with a 100W linear, that will get into yo

RE: [Repeater-Builder] Ok, here's a weird one....

2007-02-13 Thread Gary Schafer
Two FM transmitters 90 degrees out of phase equals AM. It is not too hard to have phase shifts in equipment on the receiving end of the interference and multiple paths in the equipment. 73 Gary K4FMX > -Original Message- > From: Repeater-Builder@yahoogroups.com [mailto:Repeater- > [EMAIL

[Repeater-Builder] 2M Power Amp

2007-02-13 Thread Scott
What do the folks on the group recommend for a 2M power amp for a repeater with an exciter capable of 10-25W output? New, used, modded, otherwise. I am probably going to be replacing an older Henry that was modded and did not have a tuned input...(spur city). Scott NA4IT

Re: [Repeater-Builder] Re: Vertex VX-2000 Accessory Connector

2007-02-13 Thread Maire-Radios
we have 2 VX2000 new in the box still for sale 1. 148 to 174 25 watts VHF 1. 450 to 470 25 watts UHF 40 channel $75.00 each and shipping cost 1. 450 to 470 25 watts UHF demo unit $50.00 and add shipping John - Original Message - From: na6df To: Repeater-Builder@yahoogrou