RE: [Repeater-Builder] Decibel dipole array sweeps

For a parallel-fed (aka binary-fed, corporate-fed, etc.) antenna, if all of the elements are fed in-phase (i.e. the branches in the phasing harness are all the same length), as it typical with most dipole arrays, there won't be any uptilt/downtilt as you vary the transmitter frequency outside of t

RE: [Repeater-Builder] RE: AF2140 filter

I'm almost positive that it's a Celwave, not a Sinclair, but I don't recognize that exact part number. Their tunable low-pass filters (actually second harmonic notch filters) had part numbers like AF150-T which was for highband VHF (the 150 being the nominal center of the passbasnd frequency, i.e

RE: [Repeater-Builder] Decibel dipole array sweeps

Boy, Yahoo really mangled the URL, even though I put it in angle brackets. Let's try re-naming the file without spaces, maybe that will work... Bob - the file opened fine for me, both locally and from the web site. I'm using Acrobat 9.0. The docume

[Repeater-Builder] Decibel dipole array sweeps

I'm in the process of putting up a remote receiver for a 440 ham repeater using a Decibel DB413 dipole array cut for 450-470 MHz. Since Decibel/Andrew stopped making the 440-450 MHz custom models, I've used the usual 450-470 split antennas for receive sites, and they've performed well. I swept th

RE: [Repeater-Builder] Re: Andrews hard line help

m > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo > Sent: Tuesday, March 17, 2009 9:28 AM > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] Re: Andrews hard line help > > > Well, an L45W is nice and easy. It's one of the old-st

RE: [Repeater-Builder] Re: Andrews hard line help

Andrews L45W thats a N Mail > connector .. for the 7/8 Andrews hard line .. ( I cant get to > the roll of 7/8 right now) > > I hope to get to the other connectors tomarrow as I need a > female for the sinclare 4 bay .. > > Thanks to all for the help .. Getting ready to

RE: [Repeater-Builder] Re: Andrews hard line help

> > Rick > > Go to the files section and there is a file there "Andrew > bulletin 37383C.pdf" that is the instruction sheet for connectors. > > Craig That sheet is for the early L4 series solder-type connectors; it may or may not be applicable to the original post since we don't know which con

RE: [Repeater-Builder] Andrews hard line help

> Hello to the group ... I need to run some new 7/8 hard line > and some 1/2 inch > > Question is there any info on installing the ends on both I > did a google search and not luck > > any help would be great and also any special tools ? It's easier if you have Andrew's tools (or whoever's)

RE: [Repeater-Builder] Mastr Exec II question

No, a Mastr II receiver will not fit in an Exec II. While a lot of the circuitry is similiar between the two, mechanically they're different. --- Jeff WN3A > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com

RE: [Repeater-Builder] Re: 220 Repeater Power Amp

I second Skipp's motion, having been burned by Henry twice before, UHF amps delivered without a low pass filter, second harmonic about -40 dBc in the cell band... Also, TPL manufactures 220 amps (I had one, Adam N2ACF has it now), primarily for overseas markets. They use the same devices as in t

RE: [Repeater-Builder] Re: Recomendations on "T" band duplexer

28-69-02A (or B), garden-variety 4" 4-cavity pass/reject, fixed loops, BNC connectors, the typical duplexer for 3 MHz split applications. The only difference between A and B is the mounting brackets (one is front-mount, the other has added brackets for rear-mount). 28-69-01A for 4-cavity 6-5/8"

RE: [Repeater-Builder] Recomendations on "T" band duplexer

TX-RX would be my suggestion. My only pet peeve with TX-RX duplexers that on the duplexers that use garden variety 4" cavities is that they have BNC connectors instead of type N. If you opt for their "Type N connector" upgrade, you just get three BNC to type N adapters. Their larger cavities/du

RE: [Repeater-Builder] Re: Quieting duplex noise from a tower

> There seems to be lots of opinions , how about a simple find > the problem fella's ? > I recently was asked to find some noise on a similar > situation . We fired up my promax 577 tuned around a little > whilst climbing and found the problem making the fix asy ( > some wire clamps on the su

RE: [Repeater-Builder] Re: DB duplexer question

> Jeff here you go > > 12" > 8 5/8 " > 10" > 8 1/2" > > The two short ones are the cav conecters. the others are for the Tee. > > Dave Ka9gfs I went through four different varients of the square-cavity DB4076's here and none of them have cable lengths that match yours. In all cases, the cabl

RE: [Repeater-Builder] Quieting duplex noise from a tower

> > Are you using a preamp? If so, what do you have ahead of it > for filtering, > > and/or have you tested without the preamp? > > Yes I use a preamp. > DB4062 duplexer and two DB4002B 11" pass cavities, pass cavity loops > set for 1 dB insertion loss each cavity. I tried tightening it up to >

RE: [Repeater-Builder] Quieting duplex noise from a tower

> Three different antennas (all DB or Sinclair, two of them NEW) have > been tried with no significant change. The feedline (Andrew > LDF5-50A) has been swapped out once with no change. > > I think that leaves the tower or other nearby metal structures as > the prime suspects. You didn't give

RE: [Repeater-Builder] GE mastr II station PA

> My biggest concern is > about the Power Amp. I meant to comment on this - the power amp is the least of your worries. The exciter and receiver is where you'll likely have bigger problems. Here again, it's probably easier to find 450-470 boards and swap them out.

RE: [Repeater-Builder] GE mastr II station PA

> Can anyone enlighten me as to the difference between the G5 > and G9 version of the 40 watt PA?. If I remember right, one capacitor is changed, and one is either added or deleted. I have GE's mod sheet that tells you how to "convert" a 40 watt 406-420 to a 420-450. Email direct if you want a

RE: [Repeater-Builder] Re: DB duplexer question

> All the DM 4076 pictures show roung cans, The round can versions came later, first tan in color, then grey, then ultimately Decibel "Tek Black". The square ones were the earliest ones - they started out a lighter tan (lighter than yours), and then went to that mocha color like you have. As for

RE: [Repeater-Builder] DB duplexer Question

It looks like an older DB-4076. However, the model # on the sticker shows it's an "SP" (special production) model. Between the type N connectors there is a little cap. Remove that cap - do you see a trimmer cap inside? If so, it's likely it's a DB-4076 or close relative. If not, then the cavit

[Repeater-Builder] Need crossband coupler

Looking for a UHF/800 crossband coupler, weatherproof. Candidates include: TX-RX Systems 80-05-01 TX-RX Systems 80-05-03 TX-RX Systems 80-05-04 TX-RX Systems 80-05-10 Telewave TS-4680 Hoping to find someone that has one in excellent-to-new condition they might part with for cash or trade. Need

RE: [Repeater-Builder] Simpler Radios, (Was PL vs. DPL)

> Ahh, the Tempo S1! You could always tell when someone had one > of these > because of the "Tempo Ping" when you went to transmit and the PLL > locked. I still have my S1T on the shelf and I'm looking for the > extendable antenna for it that I lost. I can't bring myself > to getting > rid of

RE: [Repeater-Builder] WTT- db4076w-a

The DB4076 will tune to the ham band without any modifications, but if you really want to trade for something else, drop me a private email. --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoog

[Repeater-Builder] Looking for Crescend/Milcom amps, dead or alive

I'm looking for Crescend/Milcom amplifiers, preferably dead, or alive if they're UHF. What I'm really in need of is the "frame" that the PA heatsink assembly mounts to; I have several amps/heatsinks but am missing the frames (don't ask, that's how I received them...). These are gold-anodized uni

RE: [Repeater-Builder] WANTED: heliax

I really don't like using Superflex (FSJ) outdoors. The jacket on FSJ is much thinner than it is on LDF, making it easier to get water in due to a small nick. Also, the corrugation on FSJ is helical (spiral), whereas LDF is annular ("rings"). The helical corrugation also makes it easier for wat

RE: [Repeater-Builder] Micor newbie needs advice

Re: Micor receiver stirp > At any rate, I'd like to be able to run this beast on my > bench. Where can I > come up with a harness and control, and what (if any) > additional hardware > would I need to be able to get this thing hooked up? The easiest thing would be to find a SpectraTAC receiver

[Repeater-Builder] Zetron simulcast delay - looking for manual

I have a Zetron simulcast delay unit. The sticker on it says model # "Simulcast Delay Unit". In doing some web searches, I think it might be the same as a Zetron model 62, although it doesn't bear that model number anywhere on it. It's a half-rack unit wide, 1 RU high. Can't find anything appl

RE: [Repeater-Builder] ACC RC96 rx audio gating

> Has anyone ever figured out why the RC96 does NOT mute RX audio when > the receiver is inactive? > > Looking at the schematic it appears that the rx audio mux switch pin > of IC9 (4053) should, in theory (according to the schematic), control > the audio gating. The switch control pin is tied

RE: [Repeater-Builder] Re: Hamtronics Helical Resonator Preamp or Advanced Research Preamp

> Again, 20 ft. of 7/8" for 2 meters is an unnecessary expense. > 20 ft. of > RG-214 has only 0.5 dB of loss @ 146 MHz - quite acceptable for a > first-rate system, and it won't cost you that much even if > you have to buy > it @ retail $$. > > Bob NO6B If your repeater cabinet and the anten

RE: [Repeater-Builder] duplexer

If I remember right, it's four notches and two passes. The normal configuration was one pass and one notch on the Rx leg, and two pass and two notch on the Tx leg. --- Jeff WN3A > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:rep

RE: [Repeater-Builder] Micor Repeater

If I remember right, Motorola's spec is 92 watts out of the amplifier should yield 75 watts out the back of the station. That translates into 0.9 dB loss through the antenna network (isolator, LPF, etc.). Sounds like your 1 dB is about right...it may be a tenth or two higher since it's being use

RE: [Repeater-Builder] Iso-coupler

> Got and opportunity to locate a repeater on a nice tall 1000 > watt broadcast tower.I need an iso-coupler. Where is the > best place to order one? Who has the best pricesthese > things are not cheap.It will need to be cut to freq of course > > ron Call Sinan at Armstrong T

RE: [Repeater-Builder] WANTED:222Mhz repeater

I have several sets of Telewave pass/reject duplexers (built from cavities taken from 220 combiners). See http://www.telewave.com/pdf/TWDS-6026.pdf. I don't have the rack-mount brackets however. Also I have Sinclair and Telewave 220 cavities, window filters, isolators, etc. Email direct if inte

RE: [Repeater-Builder] GE DELTA SX or S VHF HI MAINTENANCE MANUAL

> Looking for Delta SX or S VHF HI maintneance manual for download or > sale (cheap). LBI31371B would do. I can't find that LBI number - did you mean 31517 or 31537? These are for the S. Search the LBI page on repeater-builder.com for others. http://www.repeater-builder.com/ge/lbi-library/lbi

RE: [Repeater-Builder] Re: OT- Digital TV converter box issues

> Jeff, you can do that with a $3 microcontroller easily. PVT me if you > need some help. If you're hinting at sending IR to turn the box on, and change to the desired channel, after the power failure, I thought of that, but I'm looking for an off-the-shelf solution.

RE: [Repeater-Builder] Re: OT- Digital TV converter box issues

At the risk of dragging this OT thread out a little further, I have a tech question. I need to order a number of converter boxes to use as emergency alert system (EAS) receivers (just using the left/right audio outputs, don't care about video). I need to find boxes that will power up automatical

RE: [Repeater-Builder] Anybody recognize this writeup?

Appears to have come from the League: www.arrl.org/tis/info/pdf/repeater1.pdf > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike > Morris WA6ILQ > Sent: Monday, January 05, 2009 3:44 PM > To: Repeater-Builder@y

RE: [Repeater-Builder] Decibel DB-4076 duplexers

There were a number or revisions to the DB-4076 over the years - here are at least 4 different cable lengths/sets depending on the vintage that I'm aware of. There is no magic formula. --- Jeff WN3A > -Original Message- > From: Repeater-Builder@yahoogroups.com

RE: [Repeater-Builder] Antenna Hardware

For hod-dipped galv U-bolts, Rohn always had a good selection. I don't know if I've ordered any since Radian took over. Pirod/Valmont also used to have a good selection of hardware, though I found that a lot of what they had wasn't always in their catalog or on the web site. For stainless, if y

RE: [Repeater-Builder] Broken Rock MT. tower collapse

> Nah I have a NOAA station Running 1 kw at one of my sites. > they are NOT running on a 2 bay that looks like an FM. > It actually looks like a DB products repeater antenna with > folded loops > on 162.*** > That 2 Bay on top of that collapsed tower is for an FM > station or Translator. what is

RE: [Repeater-Builder] 900mhz dup.s

> Can these 900mhz dup.s be used on 900mhz VOICE repeater? They were on > a paging system and are Bp dup.s. Without measuring the rejection at whatever offset (12 MHz, 25 MHz, etc.) they would be used at, it's hard to say whether or not two pass cavities on each side would afford enough isolation

RE: [Repeater-Builder] MastrII PA Rack Mount

> I have the need to mount a MastrII PA in a standard 19 inch two post > rack as opposed to it being mounted on the back of the repeater. I > believe I'll need a set of "ears" or "tabs" that will mount to the PA > and extend it so it mounts into the rack. How about using one of the PA frames fr

RE: [Repeater-Builder] Re: DB antenna question

> I can't see ruining the bottom half of a good harness when I > have top top half from another antenna that is been damaged > that I can use. Last time I had to replace one of the > connectors on a DB antenna the VB material in the cable > either was still sticky or got that way from trying to

RE: [Repeater-Builder] DB antenna question

> 1. Mounting the dipoles and harness from a UHF DB420 on the same mast > as a VHF DB224, or vice versa. (UHF and VHF antennas on the same > mast) There will be a lot of interaction between the two. I wouldn't do this. You'd also likely need extra filtering on the ground between the VHF and UH

RE: [Repeater-Builder] Re: Shutting Down Battery Back up

> Any body know what is the name of relay that have a gear on > the side, every time the relay energize once it turn the gear > and lock the relay position from normally close > to open and open to close, I have one of the relay that work > that way long time ago, maybe its still available today

RE: [Repeater-Builder] Ge mastr 2 link question

> >Do you have speakers hooked up to the M2's? If so, do you > hear hum when > >there's receiver activity? > > ...but if you DON'T have speakers connected, have you terminated the > speaker outputs into 4 or 8 ohm power resistors? I've seen > Mastr II audio > PAs go bonkers when those outputs

RE: [Repeater-Builder] Ge mastr 2 link question

> Thanks for all of the suggestions. However I think you > guys are missing the problem. Both repeaters work fine when > they are not linked together. As stand alone machines they > work fine and the audio sounds fine. Once I turn on the > secondary port on the NHRC-4/m2 is when the noise

RE: [Repeater-Builder] Re: Z-match help?

> > Despite GE's LBIs on adjusting these networks, I adjust them for > maximum amplifier efficiency, not following the LBI instructions. > Makes a big difference in amplifier current draw if done carefully. > > Laryn K8TVZ I strongly second the motion. The procedure in the LBI is having you t

RE: [Repeater-Builder] Power Supply Wanted

A Micro supply? Or do you mean Micor supply? A Micro supply isn't going to be very micro at 50-70 amps. A Micor supply is going to groan and ultimately go poof at 50-70 amps. > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of Maire-R

RE: [Repeater-Builder] Re: Desense has me pulling my hair out! (Was DB4060 Duplexer Cables

> Skipp, > > > Please explain your first statement. if I can't see it on the > spectrum analyzer, then what is it? Not to step on Skipp's toes, but I think what he was getting at is that spectrum analyzers have a limited dynamic range, probably around 80 dB. So you can only see noise/spurs dow

RE: [Repeater-Builder] Desense has me pulling my hair out! (Was DB4060 Duplexer Cables

> With the tee connector split and the TX side going into a > dummy load, there is no desense. If I reconnect the tee and > go to the -8920, the desense is back. You lost me on that one. You're saying you're testing for desense by removing the tee from the antenna port of the duplexer, feedi

RE: [Repeater-Builder] perhaps OT: need connector

> I'm trying to resurrect a 'Hybrid Ring Combiner'; it takes two 950 MHz > broadcast STL transmitters into a common antenna A Marti intermod-maker, right? > I need one of the chassis-mount N-female connectors, it has > one of the 4 > 'fingers' broke off the center connector I have Deltas with g

RE: [Repeater-Builder] Re: Portable Temporary Repeater

> 1) yes, to everyone that suggested, UHF would be better and > simpler in this situation! Back to the original post! I DO > NOT have any spare UHF units laying around, and no budget to > purchase any! The goal was to try and come up with a > solution with the parts that I have on hand!

RE: [Repeater-Builder] LMR-400 Cable

> Is the 400 really > not that suitable for duplex operation even at 6 meters? What > would be a good alternate choice ? Foil and braid cables have a long running history of causing duplex noise problems. God knows I've pulled enough of it out of service of the years. More often than not, thoug

RE: [Repeater-Builder] UHF LINK ANTENNA QUESTION HELP NEEDED!

> For now I received permission to link directly on their input until > the club installs a remote base and yagi next spring. > > There repeater is about 20 air miles away. I am using a 5 element UHF > Yagi about 45 feet up a 170 Rohn 65 at my hub site! > > The Yagi is facing due West. The link

RE: [Repeater-Builder] Quarter Wave Stubs/Notching Interference

> The local repeater is running 30 watts on 146.85 to a DB-224 > at about 125 feet. The link is on 145.11 10 watts to an > 8-element beam at about 70 feet. How good is the path between your site and the target repeater? If it's LOS, you can probably put a pad in front of the link receiver and

RE: [Repeater-Builder] Re: Cavity interconnection cable length

> SO what I'll do is use the VNA to measure the loop's XL, calculate a > starting point for coax lengths based upon it, and make a few other > cables which are slightly different in length. Then I'll see what > works best. The problem is that the XL of the loop in free space (unloaded) really d

RE: [Repeater-Builder] Re: Cavity interconnection cable length

> By actual length do you mean the length of the entire conductor, the > circumference of the loop? That could be a couple inches on VHF > cavities. I think some of the comments made in this thread are misleading. The coupling element (loop, probe, whatever) adds *some* electrical length, but

[Repeater-Builder] Any M/A-Com dealers out there?

Anyone on the list a Tyco M/A-Com dealer? I need to order some parts, and it's been so long since I've ordered that my account went stale. Please email direct if you can help. Or, just in case anybody has some laying around, I need a bunch of the contact pins for Delta/Rangr system connectors.

RE: [Repeater-Builder] Height Gain figure

> Where can you experience a situation where you have > line-of-sight, but poor > fresnel clearance, and have no communications path (assume > VHF and UHF, not > microwave)? Is there ever a case? A couple of simple examples: 1. If you have an exactly-wrong height as far as Fresnel clearance

RE: [Repeater-Builder] Height Gain figure

> At one point I had read a number for figuring out the gain you get by > increasing the height. Of course at the moment I'm unable to > locate that. > > ie: If I move the same antenna (VHF 2m) up a hill and gain 100' of > elevation, but it costs me the line loss (300'), did I really gain > a

RE: [Repeater-Builder] DB408 / DB420 in the ham band? (was Re: DB314)

> Jeff, do you know of any commercial vendors that have the ham cut DB > antennas? I thought most do not since...I thought...since they were > not made anymore. Could be wrong I guess. I don't know of any. Since they were special-order, there probably were few, if any, dealers that stocked them e

RE: [Repeater-Builder] DB408 / DB420 in the ham band? (was Re: DB314)

> You gentlemen have really made me think about the pros / cons of the > DB314. After talking with my tech partner on this project, I think we > are going to go with a DB224 and DB408 or DB420 combo for the remote > antenna. It really is overkill for a remote antenna, but since we > will be given a

RE: [Repeater-Builder] DB314

TX-RX will also stack VHF and UHF antennas in whatever arrangement you want on the same mast. Their antennas are made by RF Industries, an Australian company (www.rfi.com.au), not to be confused with the RF Industries that makes connectors and adapters and the like. I've been meaning to try thei

RE: [Repeater-Builder] UHF MICOR Unified Chassis

> I know these stations have jumpers all over the place - > backplane, cards, > etc. - that all needed to be configured properly for the > thing to work the > way it should. I have the manuals, but I am stumped. I know > I'm missing > something, SOMEWHERE - my problem is: WHAT and WHERE? Could

RE: [Repeater-Builder] Cable length for NOTCH cavity?

> So... I tuned a spare can as a notch (~19db) at freq X and intend to > place it in-line with the Radius in hopes of removing (lowering) the > level of freq X getting into the Radius transmitter. A 20 dB > reduction "should" reduce the intermod by 40 dB IF the mixing is > happening in the Radius.

RE: Re: RE: [Repeater-Builder] Re: PL Problem

Holy cow! I don't know how I did that - I was replying to a completely different message from someone else but somehow I sent it to the list. Sorry 'bout that... > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of

RE: Re: RE: [Repeater-Builder] Re: PL Problem

I'll probably get down there before they finish. They don't need me there to put the dish together - I would just be standing there watching anyway. Once they're done we'll have to do the alignment, configure the receiver, finish the wiring up, etc. Is Mel done with whatever he has to do to autom

RE: [Repeater-Builder] Switching a Repeater Betwen AC Sources

> > Jeff, > > I understand and appreciate the nuances of your question. I > guess what I am > trying to convey, perhaps unsuccessfully, is that it is > unwise to attempt to > make a case for an exception to the NEC based upon > "conventional wisdom." I guess I'm not explaining myself well ei

RE: [Repeater-Builder] Switching a Repeater Betwen AC Sources

> Jeff, > > Whether multiple ground paths exist is irrelevant. What the > NEC requires is > a direct, low-impedance fault return path for each branch circuit, > considered individually. You cannot dispense with any ground > paths because > you think there exists alternate paths. While it is true

RE: [Repeater-Builder] Switching a Repeater Betwen AC Sources

> The primary purpose of the equipment grounding conductor > (green wire) is to > provide a low-impedance path for fault current on a branch > circuit. The > lowest-possible impedance is realized only when the EGC is > routed alongside > the phase conductor. Article 250.24(C)(1) states: "This >

RE: [Repeater-Builder] Switching a Repeater Betwen AC Sources

> It is important to switch all three power leads, not just the > hot lead, > because neutrals from separate sources cannot be made common- > especially > when a separately-derived power source is involved- and the equipment > grounds must guide any fault current back to the source via > the mos

RE: [Repeater-Builder] Re: Switching a Repeater Between AC Sources

> > Why not use a UPS? > > Well, there's the old problem of battery life. One of these repeaters > is the primary Skywarn repeater for the area. The NWS is very > interested in weather reports from this area since we are the first to > see what has actually come across Lake Michigan. It needs to b

RE: [Repeater-Builder] Measuring Desense

> The one I use looks exactly like the one shown, but mine has > a small disk at the end of the adjustable BNC probe. > 73 - Jim W5ZIT The picture in the PDF is for a different model that uses a grounded loop (HX or HY series), not the capacitively-coupled (electrostatic) HZ series like the on

RE: [Repeater-Builder] Measuring Desense

You can get a very nice, silver-plated, adjustable Microlab/FXR sampler (isotee) here for $15: http://www.ridgeequipment.com/store/attenuators.html I've bought a lot of stuff from Nick and the guys at Ridge Equipment over the years, both direct, via Ebay, and at Dayton. They have a lot of goodi

RE: [Repeater-Builder] Re: Frequency Change do I retune duplexer?

> >This is why it is best to put about 1-2 db 50 ohm pad > between the duplexer > >and the receiver, to help keep the receive side at 50 ohm. > > And degrade my system sensitivity by that same amount? No thanks. Maybe I misunderstood - I thought he was suggesting using pads while tuning, not du

RE: [Repeater-Builder] Re: Frequency Change do I retune duplexer?

I'd go with more like 6 or 10 dB. The return loss of a pad is equal to twice its insertion loss, so if you use a 6 dB pad, the worst-case return loss would be 12 dB (i.e. if the pad were open or shorted at the far end). This 12 dB plus whatever the return loss is of the device under test (which,

RE: [Repeater-Builder] Tower lighting on 200 foot tower - maybe off topic

> To all, > I know that a 200' tower requires lighting, however my question > concerns the tower having been abandoned for some years, maybe 10 or > so, without lights or power to the site. If assuming the > lease on this > site (from the state)is there any particular rules that apply under >

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> Here's where I'm probably making a mistake: The "energy" in > the audio spectrum is the intelligence (signal) energy + > noise energy at any time t. Am I missing something where the > intelligence energy is reduced on a noisy signal or something? Depending on how you look at it, yes, because

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> Not quite enough of a programmer to take on the DSP, but will > likely look at the peaks and valleys with the ADC. I'm not > sure why I'd need more than one noise circuit though. I don't > want to do a sample and hold, the ADC and software can do > that. I was thinking build one analog circui

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> Or, bring all the remote receivers in on digital links, and > encode a bitstream carrying continuous quieting level data? Sounds like a modernization of the old TAC system that used in-band tone signalling to indicate quieting levels. The quieting level was represented by two tones, A, and B

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> My exact issue when looking at S/N generators -- the analog > part. Which is why I am about to build a 2-3kHz bandpass > filter and switch to looking for low averaged values by less > integration (shorter delta t) and faster sampling in the ADC > to look for "valleys" in a "better" way. Make

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> Many Burger Kings have a full-duplex cross band radio/repeater > system in the drive through operation. No voters but there is > an included sensor input to detect cars at the order take window. > > cheers, > s. And don't try to tell me that you haven't, at the very least, _thought_ about

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> You mentioned a re-write of the LDG software. Would you be > willing to share whether or not you changed what the > processor is looking at from the ADC to consider a channel to > be the best? What intrigues me most about the LDG is that the > difference between being a straight S/N voter a

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> I'm curious. Why do you use the LDG over the surplus > commercial stuff? I started with one single-site 440 repeater. Then I decided to add a remote receiver. At first the two receivers were PL-steered, but that was a PITA for users, so I decided it was time for a voter (or more technicall

RE: [Repeater-Builder] Re: Anyone familiar with the LDG RVS-8 Voting system?

> Note that the LDG voter does NOT use TTL voltages on the COR > inputs ! > This bit me HARD a few years ago. They're "raw" CMOS inputs, with those chips running directly off the 12V (or 13.8 or whatever) supply, i.e. no internal voltage regulation. The high/low transition points for the inp

RE: [Repeater-Builder] Re: need slug for GE Delta

day > morning for the tweaker... and on the internet for GC tools... maybe > Action Electronics. I hate finding cracked Slugs. Well I have a few > and would like to down band and tune them up just incase I have an > emergency and need a receiver or transmitter to cover one of

RE: [Repeater-Builder] need slug for GE Delta

The tweaker you want is a GC 9440. If you're going to be working on a lot of Deltas, stock up on them, 'cuz you'll probably snap the little tip off more than one. I bought a dozen from Action Electronics a while ago. They're also in one of GC's tuning tool kits, as well as the kit Radio Shack se

RE: [Repeater-Builder] Re: antenna suggestions for 440mhz

> even if the harness is balanced it's only effective at the > design freq so a freq change makes a phase shift and alters > the tilt / transmission angle ? > Don't think of the feed system in terms of wavelength multiples - I'm guessing that's where your train of thought is jumping the tracks

RE: [Repeater-Builder] Re: antenna suggestions for 440mhz

> PS - With work, I was able to model tower-mounted antennas > for 10M, using two-element colinears for both transmit and > receive, that achieved 70 dB isolation at 400' vertical > spacing. When I improved the model of the tower to account > for other hardware, guy wires, etc., not so much. I

RE: [Repeater-Builder] Re: antenna suggestions for 440mhz

> At 4.5% above design frequency, the difference in the pattern > of the single dipole is negligible, and the gain rises 0.04 dB. > At 4.5% below design frequency, the difference in the pattern > of the single dipole is negligible, and the gain drops 0.04 dB. OK, so you've confirmed that the mai

RE: [Repeater-Builder] Re: antenna suggestions for 440mhz

> Jeff, the pattern depends on both phasing and spacing. As > frequency drops, the interelement phasing, expressed in > degrees, remains the same, but the spacing, expressed in > degrees or wavelengths, drops. This is true. However, the antenna was originally designed for no downtilt, and al

RE: [Repeater-Builder] Re: antenna suggestions for 440mhz

> I was looking for more of a "generic" answer along the lines > of, "As you > move down in frequency, electrical downtilt ." (Enter INCREASES or > DECREASES here as necessary -- if this is the case.) I know you wanted a short answer, but this got kind of long-winded... A series-fed antenn

RE: [Repeater-Builder] Re: antenna suggestions for 440mhz

> First off you will definitely loose some of the gain from the original > "rated specs". About 1.5 - 2 Dbd. is what I'd expect...Maybe a little > worse depending on where the antenna was originally "cut for"... For > example, If the antenna was originally built for say a 454.xxx freq > (center f

RE: [Repeater-Builder] Re: 455khz filter for Mastr II discriminator audio

> Since both you & Jeff asked the same question, I thought I'd > speculate. My question was rhetorical and tounge-in-cheek...I wasn't looking for an answer as I already knew it. > Noise squelches generally start with a HPF of some sort followed by a > detector & post-detector filter. The cutoff

RE: [Repeater-Builder] Re: 455khz filter for Mastr II discriminator audio

> I'll put it on the analyzer again and look but I'm pretty sure there's > a pronounced spike in the discriminator output up around 450khz. > There is, without a doubt, some unexpected high frequency noise on the > discriminator audio there that's throwing off the offboard squelch. Why in the wor

RE: [Repeater-Builder] Trilectric A25100UR Repeater Amp

Decibel Products was, for a while, selling Trilectric amps. I don't know whether they actually bougt them out or if they were just reselling them. I haven't seen them in catalogs or for sale new anywhere in probably 15 years. I have a few of those amps but no manuals, sorry.

[Repeater-Builder] Microfiche scanning?

I have what I believe to be a complete set of GE two-way manuals on microfiche. The main "library" is dated 1980/1981, and there are update packages that go up through the mid 1980's. Most likely the base library includes radios dating back much older. I don't have a microfiche reader (nor do I

RE: [Repeater-Builder] mice at repeater sights

> Some of you pros have delt with this i am sure. > A commercial repeater that i do some work on, i went up to the sight > after over a year, and let's just say it was a horrible sight. > The mice brought the repeater to its knees. > Anyone have some advice on getting rid of the little bastards an

RE: [Repeater-Builder] Need help IDing Celwave filter

> It is about 10"x10" square and 1" high, and has SMA connectors, one > on each side (left/right), and 9 flat-head tuning screws in the > front (just like the ones on the small 50w duplexers). Sounds like the filters John Danielson has been selling for the last several years at Dayton and on his

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