RE: [Repeater-Builder] Helix / Connectors

RFS also has aluminum-shield versions of their standard LCF line too - the part numbers all end in "L" for "Lite" (such as LCF78-50JL). Aluminum-shielded cable isn't anything new. It's pretty much the standard in CATV, and was quite common in two-way back in the day as well. Andrew, Prodelin, P

RE: [Repeater-Builder] Service Monitor (HP) calibration

> Does anyone know of a place relatively close to CT (or NYC > metro area) > that does service monitor calibrations? Amtronix (www.amtronix.com) in NY state. Extremely reasonable, top notch service. If shipping it is your concern, call him (Rick) and ask if he can send you a shipping box or tr

RE: [Repeater-Builder] Ground Strap Installation. Best way to run it?

To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Ground Strap Installation. > Best way to run it? > > > > Thanks Jeff > I have just learned something new today. > So you would need an acetylene torch to provide enough heat >

RE: [Repeater-Builder] Ground Strap Installation. Best way to run it?

> > Hi Jeff > Just wondering why silver? Lower impedance or higher melt > temp or both? Strength and melting point. Note that "silver soldering" isn't soldering using soft solder that has some silver in it, such as tin+silver or tin+silver+copper. Those kinds of soft solder are often called "

RE: [Repeater-Builder] Ground Strap Installation. Best way to run it?

> What happens if I have a strap running horizontally nailed flat on a > wall and I need to go vertically down with another strap to tied onto > it making a T. This vertical strap would also be nailed flat on the > wall. Wouldn't this sharp corner present a high impedance? Yes, to some degree, bu

RE: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

piece of test equipment, as well as how > Rick's model does. > I'm betting that Rick's will hold it's own against the Eagle > (which I've > always thought was overpriced.) > > Chuck > WB2EDV > > - Original Message - > From: &q

RE: [Repeater-Builder] Re: [rfamplifiers] Return Loss Bridge Kit

How about this. I'll ask Rick if he'll send me a demo unit, and I'll compare it to my Eagle, using my VNA as the reference (Agilent E5070B). --- Jeff > > First thing I would say is that if Rick is selling it, assume > it works. > > I run an Eagle unit and

[Repeater-Builder] Inexpensive return loss bridge

Rick at Amtronix is now selling a bargain-priced return loss bridge - $69 kit, $109 assembled and tested. Covers 400 kHz to 1 GHz. Directivity spec is 30 dB. No, it doesn't turn your TG/SA into a $50k VNA, but for a little over a Franklin, it looks like quite a deal. Details and specs on Amtro

RE: [Repeater-Builder] Re: Sorta OT: Looking for a couple of items

> > The problem with the Glenayre exciter is trying to figure out how to > program it to the ham bands. There is a company in Illinois > that still > fixes Quintron/Glenayre stuff, I think they could program one > for you. > There is one on eBay right now. I maintained a 900MHz > Glenarye di

RE: [Repeater-Builder] Re: Dual receivers on one antenna for RX only site

> When I say the notch presents a "short" it is not really a > short but a very low impedance of say a few ohms. But by > having the unwanted source impedance high rather than at 50 > ohms it is much easier to pull the high impedance down with > the "few ohms" short circuit than it would be if

RE: [Repeater-Builder] Antenna Phasing Question

> I have three (3) Antel [BCD 80010] 806-900 mHz vertical > antennae that I would like to mount on the three legs of my > tower for omni pattern (Rec. only). Several questions come to mind. > > 1.) At the rated frequency, how many inches should the side > arm place the ant. from the tower? > >

RE: [Repeater-Builder] Amphenol Connex RF connectors

> Anyone care to comment on the quality of the Amphenol Connex > line of RF connectors? They have a pretty good price point, > but only if they aren't junk. > > lh It is my understanding that Connex was started as a division of Amphenol after some kind of a buy-out of another manufacturer that

RE: [Repeater-Builder] Re: LMR Cable

> What is the difference between real and un-real RG214? There are some non-mil-spec RG214 varients out there. Sometimes they are labeled as "RG214 TYPE", or "RG214 Commercial". These typically have double braid like "real" RG214, but unlike "real" RG214, the braids are bare copper instead of

RE: [Repeater-Builder] Micor TLD1693 Amp

Well, there seems to be a bit of a mystery. The schematic in the base/repeater station manual I have shows: C531 43L 30M 24H But the parts list shows: C531 43L 36M 24H So is it 30 or 36 pF? Who you gonna believe? I checked a mobile Micor manual, and it's listed as 30 pF in the parts list; t

RE: [Repeater-Builder] Re: LOOONG audio runs

> On Sun, 28 Feb 2010, Mike Morris WA6ILQ wrote: > > 2) the pair that was receiving the problem was a high > impedance load > > or an unbalanced load (i.e. one side grounded). Use an > ungrounded 600 > > ohm winding from a transformer on each end of each pair. > > The nominal impedance of a co

[Repeater-Builder] Motorola paging reeds

A while ago someone was looking for Motorola vibrasponder reeds for paging tones, and I responded back that I had a bunch of them but had to find them. I've since lost that person's name/email address. I finally found them (accidentally). If you're the person that wanted them, please email direc

RE: [Repeater-Builder] LOOONG audio runs

> I have a odd situation where I need to run long audio cables > between my > repeater controller and two repeaters. In this case, the > repeater controller > will be connected to 2 repeaters in the same cabinette. The other two > repeaters will connected thru about 140 feet of wiring to the > o

RE: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?

> In a station, the 9.6 volt circuitry *could* be run from 12 volts, as > long as its regulated. I'm not suggesting someone does that, because > the circuits were optimized for 9.6 volts, but I'm trying to > make a point. Point taken, but to add to your cautionary note, there are some circuits

RE: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?

> The diagram for the adapter box also shows +13 Vdc is also routed > to one of the pins in the same plug (as well as ground) so I have > to figure out if that's a requirement or just an addition to the > adapter package. I did see where +13 Vdc was supplied to another > location on the repeate

RE: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?

> > On 2/23/2010 3:11 PM, Jim WB5OXQ inb Waco, TX wrote: > > Is it possible the AM signal is getting into an audio stage > instead of the > > receiver front end? I had that happen once. > > > Same here. All audio inteconnects are now tiny coax cables at > that site > now, installed with sh

RE: [Repeater-Builder] dual band convertacom

> My initial idea was to run an antenna switch from the > convertacom to the amps so I can manually select which one > the signal goes to. Then on the output side of the amps I > thought about using an antenna duplexer on the output of the > amps to feed the antenna. I think you'll find that

RE: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?

> I'm considering an ICE broadcast high-pass filter that cuts off at > 1.8Mhz (model 402). I have an email into them to see how well > it might > work at 448 Mhz. > > Tony Before you spend any "real money", you might just try a shorted quarterwave stub. If you want, I can make one up quick an

RE: [Repeater-Builder] Re: DB-201 Measurements for 6 Meters?

> On Mon, 22 Feb 2010, Jeff DePolo wrote: > > Kinda along the same lines as "always make the cable from the > > connector on the transmitter to the connector on the > duplexer an even > > half-wave". > > The reason for doing that is that if the duplexer

RE: [Repeater-Builder] Re: DB-201 Measurements for 6 Meters?

> > Think about it this way. If you made a dipole, would you > > cut one side 5% longer than the other? > > Maybe, if you had a reason for offset feed... but most offset > Dipoles are not 5% different. I thought the subject was about > 1/4 wave ground planes and not dipoles... they are not the

RE: [Repeater-Builder] Re: DB-201 Measurements for 6 Meters?

> Various ARRL publications cite the 5% longer "rule." Right or > wrong, who > knows? > > Chuck > WB2EDV At the risk of offending someone somewhere, the fact that the ARRL cites the "5% rule" without backing it up with the analysis behind the rule doesn't really suprise me... Think about it th

RE: [Repeater-Builder] Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?

> So, if we take the 1250Khz signal or 1.25Mhz x 4 = 5Mhz. I > realize that > the 4th harmonic of a 5KW broadcast station isn't very powerful Well...it *shouldn't* be very strong. It has to be attenuated 43 + 10 * log (Pwatts) as measured in the field (not at the transmitter output terminals).

RE: [Repeater-Builder] Re: DB-201 Measurements for 6 Meters?

> Yes, I don't know why the db-201 has such ridiculously long > radials, but that is how they were designed. Go figure. I > would like to know why though if someone knows... > 73 The venerable quarter-wave vertical antenna seems like such a simple antenna, but the physics behind it aren't al

RE: [Repeater-Builder] Duplexers F S

> The 4 WaCom UHF 10" cavities I believe were designed to be > part of a simple duplexer for a UHF-Lo repeater. They > *should* tune up to the 440 ham band based on what Telewave > has listed for specs on the current modern day model number. > Current config is Pass RX Reject TX on 3 cans and P

RE: [Repeater-Builder] Micor Community Repeater Supplement

le PL. --- Jeff WN3A > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo > Sent: Wednesday, February 17, 2010 12:24 PM > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] M

RE: [Repeater-Builder] "Bend" an ICOM a little further

> I just got some Bomar crystals (Not my choice) for the clubs > UHF Micor. The TX was off 14 to 39 kHz, Had to add a 10pF cap > to get the trimmer in the center range. Strangely the RX was fine. That's probably not indicitive of Bomar making a bad rock; you almost always have to change out the

RE: [Repeater-Builder] DB224A new harness

> I just recieved 2 new DB224A harnesses from Andrew. They were > made in Mexico (no surprise there, they have been making them > there for some time). Curious if you had any problems ordering them, and if I may ask, what did they run you? > I need it to work on > 147.225/147.825. I got a 1.6

RE: [Repeater-Builder] Micor Community Repeater Supplement

> I am in need of a micor UHF community repeater station > supplement number is 68-81025E55, or 68P81025E55. Email me at > my callsign at yahoo > Jim I have it in paper, but not electronic. Is there a particular section you need that I could scan? --- Je

RE: [Repeater-Builder] Connect Controller to E&M Interface

It depends on what kind of E&M interface it is. There are several (5, IIRC) physical E&M signalling/voltage types. Depending on which one it is, it might be as simple as wiring COR and PTT directly to the E and M leads, or, if the interface only will work with -48 VDC battery voltage levels, you

RE: [Repeater-Builder] RFS TDE-7780A

er-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo > Sent: Saturday, February 06, 2010 10:55 PM > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] RFS TDE-7780A > > > > > I've disassembled and compare

RE: [Repeater-Builder] RFS TDE-7780A

I've disassembled and compared the ham-split PD633-6A-1N and regular 450-470 PD633-6A-2N. The resonators are identical; they're the same length. The difference is where they are tapped - the low-split model is tapped about 1/4" further up the resonator than the 460 MHz version. The semi-rigid i

RE: [Repeater-Builder] Re: Cable lengths again

-Builder] Re: Cable lengths again > > > > Jeff, were your inter cavity jumpers Type RG-8A/U cable? Just > wondering..Joe > > Jeff DePolo wrote: > > I'll confirm also, 12" from last cavity to antenna tee, > RG214. Intra-cavity > > is 11.5". Measurem

RE: [Repeater-Builder] Re: Cable lengths again

I'll confirm also, 12" from last cavity to antenna tee, RG214. Intra-cavity is 11.5". Measurements are tip-to-tip on the type N connectors. I've done the harnesses for the older PD 526's that had RG8 on them. Some of the newest 526's have RG400 coax instead of RG214 FWIW.

RE: [Repeater-Builder] TLE1713A-1 at 448 MHz

> Phil, > > The Motorola TLE1713A Power Amplifier is rated at 75 watts > continuous duty > for 450-470 MHz. It is a component of the MICOR C64RCB > station. All of the > technical data is in Service Manual 6881025E50. The bad news > is that the > manual is NLA from Motorola, but the good news i

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

RE: [Repeater-Builder] GLB

> Can anyone burn a 2716 Prom chip for a GLB ID-1 Ide'er? > > Not a standard hex file. have some docs. > > Thanks > > Fred > wa2...@arrl.net I'm not sure what "not a standard hex file" means, but I can burn 2716's no problem. I can read any standard format (bin, mo

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

> Have chance to install a DB 224 at 450' and another one > anywhere below it. Using LDF6 on both runs. RF solid state > 110 watts out. Wanting to know the pros or cons of running > both antenna close together for more height with duplexer or > spacing antennas for isolation without duplexer?

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

RE: [Repeater-Builder] db224 Down Tilt

I've never seen one for a DB224, though I have seen them for a DB408 (4-bay UHF) with 9 degrees of downtilt. A DB224 has a pretty fat 16 degree beamwidth in the elevation pattern. You sure you really need downtilt? If your problem is "dead spots" extremely close to the base of the mountain/to

RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)

> I plugged the same values as before into CommShop, but this > time with a 1 > MHz split, and the result is about 85 dB isolation, which can > be met with > about 7.75 miles of horizontal separation. > The definitive method for testing whether your transmitter is causing > desense to your re

RE: [Repeater-Builder] FCC Ant Registration

> Use the FCC ULS search feature. From the ULS page select > find license. From that page on the right hand side select > Site based search. This will bring up a form that you can > search on several items including the ASR number. The result > will be the call signs of everyone on that tow

RE: [Repeater-Builder] FCC Ant Registration

Not directly, but you can use the ASR to get the lat/lon, then do a database search (wireless.fcc.gov, click on Databases) using those coordinates. A lot of times the license coordinates don't match the ASR coordinates exactly (due to a number of reasons), so do a "radius search", specifying so

RE: [Repeater-Builder] Motorola T1504A Duplexer Lock Nut

> Sal's idea of using small hose clamps is starting to look good ;) Use a regular nut and Locktite :-)

RE: [Repeater-Builder] Motorola T1504A Duplexer Lock Nut

Ouch. Maybe a regular nylon lock nut would work acceptably well and be a little cheaper? Isn't the outer sleeve (the one that the lock nut threads onto) slotted? If so, will it tighten up enough to keep the shaft from beint turned if you just use a a regular nut?

RE: [Repeater-Builder] Motorola T1504A Duplexer Lock Nut

Try here: http://www.mcmaster.com/#hex-locknuts/=5bcw46 Click on "Flex-top Expanding Lock Nuts" I have some T-1504 type cavities/duplexers, but not here so I can't measure the thread. --- Jeff WN3A > -Original Message- > From: Repeater-Builder@

RE: [Repeater-Builder] FS: *NEW* UHF Motorola Micor repeater on Ham band

> Eric I was just relaying what I was told (by a gov radio > tech) about how > the repeater handels encrypted communications. It just passes audio > straight through be it encrypted or analog. That way someone at the > repeater site can not eavesdrop on the secure communications going > throug

RE: [Repeater-Builder] something altogether different

> No "tone" service where I was. Ha! Whistle up 2600 on an 800 call and the world was your oyster... > I first box I actually owned outright is a timex Sinclair > 1000 with the 16k > ram pak sitting out in the shed/shack Mine was a Trash-80 Model I. I cut my teeth on a VAX-11/750 at a local

RE: [Repeater-Builder] something altogether different

> Nothing gave me more pleasure than spending my long distance > charges on > sending fidmail packets from my BBS to the hub in st. Louis > that were LADEN > with snide remarks straying further and further off topic. You actually *paid* for long distance modem calls back then ??!?? :-) :-) :

[Repeater-Builder] Longshot - Duke Energy/Texas Eastern

Does anyone have any two-way or microwave engineering contacts at Duke Energy or Texas Eastern (pipeline)? Along the same lines, does anyone know if they maintain their own microwave network or if they subcontract the maintenance out? --- Jeff WN3A

RE: [Repeater-Builder] GE MastrII CAS vs. RUS vs. RX Mute?

I also recall that the source Z of CAS and RUS isn't the same (I'm pretty sure CAS is lower than RUS), maybe somebody can confirm. And doesn't RX MUTE only source current, not sink? I thought there was a protection diode in series with the "exposed" RUX MUTE line to prevent someone from sourcing

RE: [Repeater-Builder] Re: HP E-8285A Service Monitor

If the monitor was one of the older units, then the modules have proper factory calibration data loaded in them for the entire spread up to 1000 MHz (plus the 1700-2000 segment). The firmware reads the cal data on startup. If it's one of the newer units that doesn't have modules which were factor

RE: [Repeater-Builder] Re: HP E-8285A Service Monitor

a 100w RX option if I remember correctly. Though, most > > of the units you'll find (and the cheapest) will be 2.5w, especially > > as CDMA-based cellphone development is starting to wind > down in favor > > of W-CDMA and LTE. > > > > -Brian > > >

RE: [Repeater-Builder] HP E-8285A Service Monitor

> Pros over the 8924C: The display color CRT is replaced by a EL panel, > lower burn in. Duplex and Antenna connectors are N instead of BNC, > better frequency range (older units) > > Cons: Spectrum Analyzer Is Optional, No Squelch knob, No auto > frequency counter, 2.5W max input, does not decode

RE: [Repeater-Builder] HP E-8285A Service Monitor

The older ones were general-coverage like the 892x series (100 kHz to 1 GHz, and 1700-2000 or something like that). The newer ones were limited to the cellular and PCS bands. It's not only a difference in firmware but also hardware (i.e. you can't take one of the newer ones and back-rev the firm

RE: [Repeater-Builder] Price Check on aisle five.....

The RN in the part number tells me it's the grey fire-retardant jacket. Unless Andrew changed what they make the jacket out of, it should NOT be used outdoors, it degrades quickly from UV. It's primarily intended to be used as a plenum-rated cable indoors. I remember scrapping about 800' of 1-1/

RE: [Repeater-Builder] FS: ACC controller programing

'twas me that did the RC-85 and RC-96 firmware hacks. Email me direct. --- Jeff WN3A > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Pointman > Sent: Sunday, December 06, 2009 7:15 PM

RE: [Repeater-Builder] Syntor/MCX100 Prom question

A quick check of the datasheets shows that the only difference is pin 14 which is a second chip-enable line on the smaller device, whereas it's the most significant address bit on the larger device. The Syntor can address either the smaller or bigger part depending on jumpers. If your radio was

RE: [Repeater-Builder] Cable prep and crimp on connectors

For small-diameter cables, I have Paladin "CST Vario" strippers. These are completely adjustable - you insert/remove the blade cartridges to get the strip dimensions you want for 3-level stripping, and you adjust the depths of the blades for each strip level for whatever cable you're using (i.e.

RE: [Repeater-Builder] DB-212's

That's pretty good. But what I had were the actual cutting dimensions for the elements, cables, etc. right from Decibel, similiar to what I posted for the Phelps-Dodge/Celwave dipoles. I know I have it *somewhere*... --- Jeff > -Original Message- > Fro

[Repeater-Builder] Celwave lowband dipole dimensions

I uploaded a file to Yahoo that contains a scan of the Celwave lowband dipole dimensions, harness cable lengths, and other tech info. It's entitled Celwave Lowband Dipoles.pdf. Maybe Mike or someone else might want to put it on repeater-builder.com as well. I found some notes I had on the Decib

RE: [Repeater-Builder] UHF Mastr II PA - SLOW

> After letting it cool, I key'd it up again. It immediately went up to > only 20 watts, then after about 30 seconds it hit 75 watts > and finally > after close to a minute and a half, it hit 100 watts. I let it cool > again, and same thing. This appears to be the way this amp is as > nothing

RE: [Repeater-Builder] Antenna Pattern Question

Comprod makes dipole arrays with a screen reflector, at least for VHF, not sure about UHF. I'm looking in the catalog and it shows a backside null close to 20 dB down from the main lobe. The screen reflector should be nominally about 1/4 wave behind the radiator for maximum forward gain. It cou

RE: [Repeater-Builder] Micor repeater audio

> > mzfb2001 wrote: > > I was looking in the files section and may have missed it, but I am > > looking to improve the transmit audio quality on my UHF transmiter. > > I've noticed that the audio is lacking in lows its not tinny but its > > not what I would call normal audio from a Micor. The audi

RE: [Repeater-Builder] Re: Building Low Band Loop Antennas (DB-212)

I have dimensional data for both Decibel and Celwave lowband folded dipoles *somewhere*. If there's interest I'll hunt for them. I think the Celwave design (with the "stingers") would be easier to fabricate - no bending involved. --- Jeff WN3A > -Origina

RE: [Repeater-Builder] TXRX Vari-NotchR coupling loops

> Has anyone got the dimensions of these for a 4" cavity for > 450 ish, they are the ones with 2 BNC sockets and a capacitor...Thanks > > Andy > > G8VLL I'll take one apart if nobody else responds. I have both the "ham band" 28-66-02 duplexers (100 dB isolation, 0.6 dB loss, 5 MHz split) and a

RE: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

> The repeater might be getting into the PA stage of the APRS > radio. Try > powering off the APRS radio during the time that you hear the weird > noise. I would bet that the noise goes away as soon as the APRS radio > in powered off. What kind of radio is being used for APRS? If it's someth

RE: [Repeater-Builder] Lightning Rod (Bolt)?

On most fiberglass omnis, the lighting spike at the top is an extension of the last element in the array which is actually a shorted quarter-wave section. This shorted quarter-wave section at the "far end" of the radiator serves to put the entire antenna at DC ground. Some of the cheaper fibergl

[Repeater-Builder] Antenna sweeps - more added

I added several new Sitemaster sweeps to the antenna sweep repository. I also scanned a bunch of factory hardcopy plots I had in my files for various Decibel and Sinclair dipole arrays (I don't have pre-install Sitemaster sweeps for these, they're all installed and on the air). Antennas that hav

RE: [Repeater-Builder] Repeaters vs RC

> Standard broadcast AM is 10KHz, and is wider than most other > forms of AM > (except CB, where they will do anything they want with the signal). Standard AM *audio*, in the US, is low-pass filtered at about 10 kHz, so the RF bandwidth is about 20 kHz (double sideband). CB is substantially wi

RE: [Repeater-Builder] Glenayre UHF PA (revisited)

> Resurrecting an old(er) thread. > > I just picked up a Glenayre Series 97 250w UHF amp (with > switcher supplies) of Ebay. The price was too good to pass up. > > Of course, I'd love some manuals on the thing - Model 9T97A250 > > Ken I have manuals, but not electronic. Just hope that none of

RE: [Repeater-Builder] Two transmitter combining using a duplexer?

> > > Hi Tony, > > to answer your question if it will work, the answer is yes it > will and i am doing it on a site the same way. You will > however need two dual isolators to add to each transmitter. > You will tune the reject the same way as you would normally > for the specific frequenc

RE: [Repeater-Builder] Two transmitter combining using a duplexer?

> Hey everyone, > Thought about this yesterday...would it be possible to use a > conventional pass/reject duplexer to combine two UHF > transmitters into a > single antenna? > > Example: > Transmitter A is 453Mhz > Transmitter B is 443Mhz Yes. Assuming the duplexer provides sufficient isolati

RE: [Repeater-Builder] Re: Antenna sweep - Decibel S420-440-450

> Not knowing the history of Jeff's DB408D(B), it is possible > that the previous use was for 2 separate rpt's. or base > stations, each using 1/2 of the antenna(DB404) on different > portions of the 450-470 MHz. band. The DB408D-B's that I have, four or five in all, are all new (well, they've

RE: [Repeater-Builder] Antenna sweep - Decibel S420-440-450

> > Jeff, > Do you have any similar test data available for the DB404B? > Thanks, > Gary > N6LRV In the doc is a DB408D (B range) which is two DB404-B's on the same mast, one above the other, with separate feedlines to each of the two antennas. However, the one that I swept looks a little suspici

RE: [Repeater-Builder] Antenna sweep - Decibel S420-440-450

> Any thoughts as to why the DB-420 is so much more broadbanded > than the > DB-408 & DB411? It'd be interesting to see just how far out > the DB-420 > goes, since the best RL is at the edge of the measurement > band @ 420 MHz. > > Bob NO6B Off the top of my head, no, I don't. When I go to

[Repeater-Builder] Antenna sweep - Decibel S420-440-450

I added another antenna to the periodically-updated antenna sweeps repository. This one is the NLA (no longer available) Decibel S420-440-450, the special-order ham-band version of the beloved Decibel (now Andrew) DB420 dipole array. The latest version of the antenna sweep document in PDF is a

RE: [Repeater-Builder] 8924c saga continues

Is that supposed to be 0.75V peak-to-peak or RMS? Either way, if audiotest.wav is playing a tone (I'm guessing that's what is?), why not just use the AF analyzer screen, and set the input to "AUDIO IN" and read the value numerically rather than using the scope? --- Jeff W

RE: [Repeater-Builder] OT : Amtronix is the coolest

www.amtronix.com > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of ka9qjg > Sent: Thursday, September 24, 2009 3:09 PM > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] OT : Amtronix is the cooles

RE: [Repeater-Builder] OT : Amtronix is the coolest

Rick's the man. Last time I sent an 8921 up to him for work, he gave me *for free* an original HP hard road case for my service monitor, using it to ship it back in. Now I have a hard case to use when I travel by air and need to take a SM with me. If you have an HP 892x that needs work, he's th

RE: [Repeater-Builder] Re: TKR-820

Timmie's (Timmy's?) is Tim Horton's, a restaurant/fast food chain in Canada (and I think they have some franchises in the US now too?). I don't know what to best equate it to here in the US - maybe kind of like a milder version of a Panera or Atlanta Bread Company or maybe Dunkin' Donuts? At lea

RE: [Repeater-Builder] EF Johnson 25A rack mount power Supply

I don't know which repeater it came out of, but it was probably a CR1000 or CR1010. Here's the manual for a CR1010, should get you in the ballpark. http://efjohnson.com/PDF/manuals/CR1010Repeater-ServiceMan.pdf BTW, if anyone knows of a source of those mondo dual banana plugs that EFJ used, I c

RE: [Repeater-Builder] UHF Duplexers

what they do. How > do I tune for maximum return loss? If it is better, you can > contact me off the group, so it does not get tied up. > > > Terry KM5UQ > > > > From: Jeff DePolo > To: Repeater-Builder@yahoog

RE: [Repeater-Builder] a strange unexplainable desense issue

Beyond just "turning off" the other repeaters, try terminating their antenna feedlines with a dummy load instead of leaving them connected to the equipment. See if that makes any difference. > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogr

RE: [Repeater-Builder] UHF Duplexers

You should be tuning the bandpass for maximum return loss, not least insertion loss. I've found that older Wacom duplexers develop center plunger contact problems as they age. I trashed quite a few 900 MHz duplexers and combiner cavities because the insertion loss was intermittantly high; the p

RE: Re: [Repeater-Builder] Re: Micor Station question

> I'm most familiar with Maxtrac's with regards to "less than > full power" operation, i.e. that they can produce spurs & > other undesirables when run that way. > > So other radios can have the same issues? Many do, but not all, hate to over-generalize... > I read that it is > because when

RE: [Repeater-Builder] Re: coax cable

Oh, by the way, forgot to mention, Phelps-Dodge/Celwave used to ship a RG8 jumper with Stationmasters. Some time in the fairly recent past they stopped doing that. I guess they figured everyone was tossing them out anyway... --- Jeff

RE: [Repeater-Builder] Re: coax cable

1/2" or 3/8" LDF has always been my preference for jumpers, never had a problem related to a connector damage due to lack of flexibility causing over-stress at a connector, either at the antenna or at the main transmission line. Maybe there are some ham-grade antennas where a less-flexible jumper

RE: [Repeater-Builder] Re: GE LB VHF RF Amplifier Drive Level? basic specs?

> I can't find the numbers listed below on the board with the > exception of a large 6 etched out of copper on the board. I > might now assume the unit is the 30-36 MHz unit mentioned > below unless the pc board label is printed somewhere not within > obvious view. Skipp, Look over by the l

RE: [Repeater-Builder] Diplex antenna installation using coaxial cable for 10M and 6 M

Milt said: > The > chart in the document was developed specifically for the > Spectrum series > series fed LB antenna. THE MEASUREMENTS IN THE CHART WILL NOT > WORK WITH > SHUNT FED COILS! So as I guessed, the secret sauce is the type of antenna/loading coil used. It might be a worthwhile ex

RE: [Repeater-Builder] Diplex antenna installation using coaxial cable for 10M and 6 M

> Being an analytical guy I modeled the antenna system in both > Ansoft Designer and an antenna modeling program. In Ansoft > Designer the antennas were modeled as a series RLC load with > 50 ohms at resonance and a Q of 15. Transmission lines were > modeled with VF equal to that of RG-58A/U co

RE: [Repeater-Builder] Tools

> > > All inappropriate. What's inappropriate? If what he's talking about is a spanner nut, you use a spanner wrench or a spanner driver to remove it. The thing you posted from eBay is just a four-size spanner driver. Just because it's marketed for radio purposes doesn't make it any more r

RE: [Repeater-Builder] Tools

#x27;t come up with anything that looked > familiar. I have a call in to someone who may know. If I hear > back from > him, I'll let the list know the *proper* name and how to get some. > > Scott > > Scott Zimmerman > Amateur Radio Call N3XCC > 474 Barnett Road &

RE: [Repeater-Builder] Tools

> Speaking of tools, how about the specialized wrenches that > can take the SMA connector > nut loose on, oh, say, Yaesu VX 5 or FT-50's? > > Ray, KB0STN I don't have either of those radios, but are you talking about a spanner wrench or spanner driver? Retaining ring pliers sometimes work too

RE: [Repeater-Builder] OT: Tape

> Scotch Super 33 tape is great stuff, but Scotch Super 88 is > even better- > it's thicker, has a better adhesive, and it has better UV > resistance. Cloth > tape, AKA "friction tape", should be pitched into a trash can. I haven't had friction tape in years. I remember finding rolls of it in m

RE: [Repeater-Builder] OT: Tape

This is my preferred method as well for sealing connector splices. However, I do three layers each time (one layer up, down, up again of 88, then the same of splicing tape, then again of 88). Overlap each successive wrap about 50%. Always, always, always do the last wrap in each direction goi

RE: [Repeater-Builder] LMR-400 question

I'd tend to think it might be a little better, less oxidation of the braid and foil, and less movement. I only buy the direct burial (DB) version of LMR400 anyway, it's only a few pennies more per foot, I figure it's worth the little extra protection if it gets a nick in the jacket. And, of cour

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