RE: [Repeater-Builder] ATSC pilot frequencies for sig. gen. alignment

> OK, now that NTSC video is gone, so are my handy local video > carriers that > I used to use to check the frequency accuracy of my signal > generators. However, I understand that there are pilot > carriers buried > within the 8VSB DTV signals that can be used for the same purpose. A > coupl

RE: [Repeater-Builder] Re: Antenna SWR = Desense?

(and an MSR2000 ain't no Quantar by any stretch of the imagination). --- Jeff > --- In Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> , "Jeff DePolo" > wrote: > > "Seems to

RE: [Repeater-Builder] Re: Antenna SWR = Desense?

Seems to me the three most-likely causes of your problem are: 1. Antenna itself is bad/noisy. Substituting antennas may help rule this out. 2. Not enough isolation between radiating antenna and equipment. The 100' of horizontal separation may not be enough to keep the strong RF out of your e

RE: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex

in to the > > PL259 > > and finish the soldering - some through the PL259 holes that I have > > already > > enlarged, and the center pin last. > > > > Chuck > > > > - Original Message - > > From: "Jeff DePolo" <mailto:jd0%40broad

RE: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex

I drill a hole perpendicular to the axis of the cable through the RG59 reducer (in the "smooth" area above the threads) so you can get solder to flow into it, maybe that's what Chuck was referring to? For 3/8" Superflex, the OD of the cable shield is just a tad too big to screw into a PL-259 eas

RE: [Repeater-Builder] Cavity/duplexer connection cables

I'm not familiar with those particular duplexers, but the Celwave duplexers Eric mentioned are easily damaged by over-power. Usually the insulators at the open end of the resonators (the ends with the tuning slugs) arc over and/or develop carbon-ish deposits. In cases of mis-tuning, sometimes th

RE: [Repeater-Builder] Re: Diversity FM reception

> The late 60s/70s brought along ignorant antenna designs, like the > windshield-integrated dipole and the 45-degree swept-back dipole. Now > we've got even more ignorant designs like the 45 degree stubby on the > roof of cars (06 or newer Hyundai Santa Fe is a good example of this > mistake),

RE: [Repeater-Builder] Re: 1.2 GHz Base antennas

> OK. Thanks anyway. Just thought there might be some > experimentors out there in RF land. Do you think a 420-430 > antenna work on the 3rd hanmonic, similar to using a 2 mtr. > antenna with a 440 transmitter, as I have seen mentioned here > on occaision There isn't a lot out there in bas

RE: [Repeater-Builder] Cavity/duplexer connection cables

> There seems to be confusion & mystery in the crowd of radio > buffs that I han out with (not in this group!) on the subject > of connecting cable lengths for cavity & duplexer use. I've > heard that the manufacturers of such devices also tend to be > mum on this. > > It seems to me that if t

RE: [Repeater-Builder] Effective sensitivity

> Here's a seldom-talked about issue: "effective sensitivity" . Actually, it's talked about fairly regularly here, and there are several articles on the web site about it including how to measure it. > That's why I think it's important to be able to routinely > monitor the noise level at the s

RE: RE: Re: [Repeater-Builder] Diversity FM reception

> Well, just turn your 2m handie talkie even with a rubber > ducky on its side & note the drop in signal strength. Cross > polarization losses, e.g. linear V to linear H (or vice > versa) can be up to 30 dB! In the absence of multipath, or more correctly, obstructions causing reflections that

RE: [Repeater-Builder] Circ polarization

> WN3J wrote: No, it was WN3A that wrote that. A as in "agitator" :-) > >It wasn't until car > >radios with vertical whip antennas started to gain > popularity did vertical > >polarization start to become important, and CP resulted as a > solution to > >satisfy listeners using either horizon

RE: Re: [Repeater-Builder] Diversity FM reception

> Yes, CP does cause more multipath esp. in urban environments. > Turns out there are a large number of buildings the > preferentially reflect V better than H. CP gives V energy > othwise lacking (mostly) in a strictly H xmt situation. What > you get with strictly H pol. is quite a glorious

RE: [Repeater-Builder] isolation

> While I'll agree that more isolation, then what is needed to > insure no desense is a waste; if this gentleman is suggesting > that isolation in reserve is a waste, I strongly disagree. > Why? Operating conditions can change - snow and especially > ice on the repeater antenna can detune the

RE: Re: [Repeater-Builder] Diversity FM reception

> In reference to below, what would be the real advantage to > using CP antennas in addition to the V and H you'd have > already? Any signal that arrives will excite a V and/or H > antenna according to it's arriving polarization, and I don't > see where CP would be a help. If you're going to

RE: [Repeater-Builder] Belden 9888 Triax coax question?

> I recently replaced a piece of Belden 9913 coax between the > repeater TX and the duplexer with a piece of RG-214. All of > our noise problems went away. A HA! > Unfortunately I am out of RG-214. I have some Belden 9888 > Triax and need to know if anyone has experience using it for > repe

RE: [Repeater-Builder] Re: crimping vs soldering & types of coax connectors

-------- > > --- In Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> , "Jeff DePolo" > wrote: > > "OK, here's probably more than you ever wanted to know about > crimp tools, crimp conne

RE: [Repeater-Builder] Re: crimping vs soldering & types of coax connectors

> > I'd like that information also. I know that some of the > "more technically > > proficient" hams out there who do RF design / installation > for a living > > use > > crimp only connectors, and swear by them. Are there other > vendors out > > there > > that people have used which are co

RE: [Repeater-Builder] Re: crimping vs soldering & types of coax connectors

> > The standard Kings frame is KTH-1000. The Daniels HX4 is > basically a clone > of the Kings KTH-5000. Kings, Daniels, et al make other > models, but the > KTH-5000 is the most common style. Sorry. Replace KTH-5000 with KTH-1000 in the above paragraph...

RE: [Repeater-Builder] Re: crimping vs soldering & types of coax connectors

> Would anyone care to comment on and compare the tools offered by both > Paladin and RF Industries, as well as the link earlier in this thread? > Not cheap, but not the "several hundred dollars" either as quoted by > someone above. OK, here's probably more than you ever wanted to know about crimp

RE: [Repeater-Builder] Re: Service Monitor Question

> Have you ever tried KG Electronics (http://kgelectronics.com > )? I remember talking to them before retiring the 1500, but I don't remember what the price was to replace the CRT. The attenuator (mechanical) was getting noisy/leaky too, so between those two problems,

RE: [Repeater-Builder] Re: Service Monitor Question

> Yes , I've tried to feed the signal from my external reference > oscillator into the 1200, but it takes literately volts of > signal to get > it to switch to the external osc. input. I forget what the spec was, but it seems to me it was less than +10 dBm. I think there was a warning on it

RE: [Repeater-Builder] Re: Service Monitor Question

> option, make sure it works properly. I have a bad IFR1200 > here that the > heater on the oscillator crapped out. The service monitor > works, but it > is way off frequency and can't be adjusted. The last time I priced > repair, it was in the $1,000+ range. > > 73, Joe, K1ike Joe, You've

RE: [Repeater-Builder] Re: Service Monitor Question

I'd be leaning toward an HP. Even if you have to pay a little more up front, you'll come out ahead of the game in the long run. I have three HP's (two 8920B's and an 8921A, with various options), and in the last ten years or so, only once have I had to get one of them repaired (spectrum analyzer

RE: [Repeater-Builder] Re: 3/4 wave cavity operation at 1296 MHz

the fingers). If you want a pic of the center conductor/plunger assembly email direct. --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo >

RE: [Repeater-Builder] Re: 3/4 wave cavity operation at 1296 MHz

the fingers). If you want a pic of the center conductor/plunger assembly email direct. --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo >

RE: [Repeater-Builder] Re: 3/4 wave cavity operation at 1296 MHz

> > I wonder what the diameter of the center element, or plunger, was? I think I still have one with the rivets drilled out, I'll measure when I get a chance. --- Jeff WN3A

RE: [Repeater-Builder] Notch on duplexers... How low should they go???

With a preamp, if you're only getting -106 dBm sensitivity, something is wrong. If memory serves, the spec for 12 dB SINAD without the preamp for a highband Mastr II is 0.35 uV (-116 dBm), and with the UHS preamp the sensitivity was 6 dB better (-122 dBm). Looking at the GE isolation curves, for

RE: [Repeater-Builder] Re: Building HT antennas

> Also, this project is designed to use in a mostly stationary > situation, and I was thinking of incorporating a spring or > something similar at the base of the antenna to minimize the > shock to the antenna connector. Using your idea, how about a small spring at the base, followed by a solid

RE: [Repeater-Builder] Micor Bi-Level Squelch Circuit

Alex, if memory serves, the component differences for the lowband audio/squelch board are documented in the manual. I don't remember if the station and mobile boards both have different components for lowband, or if it was just the station. I also don't remember if the SpectraTAC audio board had

RE: [Repeater-Builder] Re: 3/4 wave cavity operation at 1296 MHz

> In your experimentation, were you using 4" diam 450 MHz cans > operated at 3/4 wave for 1296 or 4" cans at 1/4 wave > (stubbies !) for 1296 ? I used both. I used UHF 4" pass cavities as 3/4 wave resonators, and also took 900 MHz 1/4 wave cavities and cut down the center to shorten them. In b

RE: [Repeater-Builder] 3/4 wave cavity operation at 1296 MHz

> What type/model/brand/size of cavities were you using? The > first thing that > comes to mind was that the cavity you were attempting to use? > > --- Jeff Sorry, hit send too soon. The first thing that comes to mind was that the cavity you were attempting to use had geometry that was causing

RE: [Repeater-Builder] 3/4 wave cavity operation at 1296 MHz

> Bench testing showed the cavities performed as expected in > 1/4 wave mode, > but no amount of loop tweaking or black magic cursing could > get the insertion > loss to acceptable levels when operated in 3/4 wave mode > (1296 MHz). Typical > IL was 2 to 3dB per can at these frequencies. All tes

RE: [Repeater-Builder] DB-224 patterns on side of tower.

> The gain figures I quoted are dBd reference the dipole > mounted in place of the DB-224 before the test. The > Scientific Atlanta turntable was connected to a circular > strip chart and the amplitude measurements were recorded > directly to the strip chart which was submitted. The > turnta

RE: [Repeater-Builder] DB-224 patterns on side of tower.

> Jeff, > > Do I understand you to then also reject the idea that an > omnidirectional colinear antenna, top-mounted on a basic > metal pole, is bogus to claim 6 dBd gain in all directions at > the same time? Nope, I didn't say that at all. > The convention is to measure gain at the horizo

RE: [Repeater-Builder] DB-224 patterns on side of tower.

> Their sample pattern when side-mounted on a tower shows 9 dBd > forward gain and -2 dBd off the back away from the tower, > again with all elements in a line. That may be getting > closer to being realistic. Err...upon closer look (zooming in on the PDF)...it's more like -3 to -4 dBd off the

RE: [Repeater-Builder] DB-224 patterns on side of tower.

for the DB224 > with all elements pointing the same direction, on a > top-mounted mast, shows > 9 dB to the front, 6 dB to the sides and 3 dB to the back of > the mast. > Almost a circle, offset. > > Chuck > WB2EDV > > - Original Message - > From: &

RE: [Repeater-Builder] DB-224 patterns on side of tower.

> Back when we had to submit an antenna pattern in order to get > a repeater license for the ham bands, I mounted four elements > of a DB-224 directly on one leg of a Rhon 25 tower and > mounted the two tower sections on an antenna test pedestal > and ran the pattern. With the antenna sections

RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure

Builder] Exec II receiver fiddling > WAS:MastrII > > Receiver Failure > > > > On my exec II receiver, the "casting" is just screwed together. > > Correct? > > > > Chris > > Kb0wlf > > > > > -Original Message- >

RE: [Repeater-Builder] Exec II receiver fiddling WAS:MastrII Receiver Failure

t; > > On my exec II receiver, the "casting" is just screwed together. > Correct? > > Chris > Kb0wlf > > > -Original Message- > > From: Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater- >

RE: [Repeater-Builder] Re: Pass-Notch Duplexer Woes

> Looks like there is 2 dB loss at a 600 khz + spacing > (which is where the problems were). (all 4 cans = 2dB) 2 dB is fine for 4 cavities per side. If you are able to get under 2.5 dB for those 4 cavities when retuned on 2m, I'd say you're doing pretty well. > What about the links inside the c

[Repeater-Builder] Free

Re: [Repeater-Builder] ARR UHF GaAsFET - free, not working > > > > I'll take it... > > Bryon Jeffers KØBSJ > > 'Jeff DePolo' wrote: > > I pulled out an ARR P432VDG GaAsFET preamp today, it's no > longer working. > > Anyone want it? I&#x

[Repeater-Builder] ARR UHF GaAsFET - free, not working

I pulled out an ARR P432VDG GaAsFET preamp today, it's no longer working. Anyone want it? I've standardized on Angle Linear; this ARR is one of the few I still have in service and I have no interest in getting it repaired.. If you want it, call ARR and get an RMA number for the repair on Monday

RE: [Repeater-Builder] Re: Pass-Notch Duplexer Woes

> I did a check on the can with the original stub, it had > a broad notch at 238 MHz (in addition to the tunable smaller > notch at the 154 mhz). The notch you're seeing at 238 is the effect of the shorted stub (I think you said it was shorted, correct me if I'm remembering wrong). Your measurem

RE: [Repeater-Builder] Pass-Notch Duplexer Woes

> Ok, now lets do the opposite. Set the spec analyzer to 147.1 & tune > it up. Set up the sig gen @ 147.7 & UH OH, 2.5dB loss. The stubs (which I take it you removed) alter the pass response. They're really notch cavities. Adding the stubs will change the response adjacent to the notch from "hig

RE: [Repeater-Builder] MastrII Receiver Failure

Chuck's got you going down the right path. At 51 MHz, you probably only have to take one turn off of each of the first two coils. At 52 MHz or higher, you might have to take off two. You need a lot of heat to get the casting open (hint: a soldering gun, even a 300 watt Weller, ain't gonna cut i

RE: [Repeater-Builder] Repeater Transmitter matching

> What Jeff recommends is adjusting the > impedance matching > device and/or the power setting so as to optimize the > efficiency. In other > words, get more power to the antenna and reduce the amount of internal > heating. It may turn out that the point of optimum efficiency > is not at the > r

RE: [Repeater-Builder] Repeater Transmitter matching

vel > affect the match?! > > (Not saying I don't believe you Jeff... I know you've > probably tested it six ways from sideways... I'm just > wondering "Why?" What am I missing here...?) > > -- > Nate Duehr, WY0X > n...@natetech.com >

RE: [Repeater-Builder] Repeater Transmitter matching

> Have you found that adjustments of power level output of the > MastrII PA > has required much retuning of the Z-matcher? I have a plan that may > drop power output during power failures and I'm wondering how the > z-matcher might affect things. Yes, the match will vary as output power is var

RE: [Repeater-Builder] Repeater Transmitter matching

An outboard Z-matcher works as well as the internal one on an M2 station PA; it shouldn't matter where along the transmission line it's placed. If you're looking for Z-matchers, there are two Decibels (one VHF, one UHF) on eBay right now for less money. As has been beatened around on this list i

RE: [Repeater-Builder] Dual Receive Antennas

You can't get there from here. Trying to add the yagi to the omni using power division topside isn't going to yield easily-predictable results. You'll have all kinds of pattern interaction between the two, with new nulls falling in quasi-random areas lacking sophisticated modeling. Your best be

RE: [Repeater-Builder] SRL235-2 Bi-Directional Antenna, which direction has gain?

th this. The instruction sheet for the > SRL235-2 says the opposite, that maximum radiation would be > perpendicular to a line drawn as described. I can scan a page from > the Sinclair instruction sheet to back up this statement. > > Paul N1BUG > > Jeff DePolo wrote: > > I

RE: [Repeater-Builder] SRL235-2 Bi-Directional Antenna, which direction has gain?

If all of the elements are parallel as in your photo, then it's bi-directional. If you drew a line through one element, through the mast, and through the other element, maximum radiation would be along that axis. If the elements are staggered such that each bay pair is rotated 90 degrees from th

RE: [Repeater-Builder] HP8924C RF Analyzer scan

That's the most-likely cause (wrong input). Other thing is that once the squelch opens, it will no longer auto-hunt if memory serves. Make sure the squelch is closed (and, if you haven't already, make sure you're on FM DEMOD in the AF Analyzer screen).

RE: [Repeater-Builder] Noise on UHF

Radar buzz (colloquial name around here is "the bees"). We get it quite often here in eastern PA/NJ/DE/MD/NY. 440 propagation has been a bit enhanced today (I wouldn't say "wide open"), but hearing stations in NYC and LI here in Philly. --- Jeff > -Original

RE: [Repeater-Builder] Glenayre UHF PA

The 97 series will work OK in the ham band. The "twisted wire" hybrids are rated for 450-512 MHz, so the balance may be a little off, and the isolation degraded a bit. I have a few in service. I found that if you run them at rated output that collector burns (solder joint fails due to repeated

RE: [Repeater-Builder] Sinclair - big price jump?

Some of Comprod's cavity filter products look a lot like TX-RX, but not all. They make a line of duplexers and filters that are square cavities, more like EMR's. TX-RX does make some square cavities; I have some square TX-RX cavities that are high-power models for 900 MHz paging. I have a coup

RE: [Repeater-Builder] Sinclair - big price jump?

I think for a while Cushcraft was using a different name for some of their commercial products, and the name was something like "Com Prod" or "Communication Products" or something similiar (I think I saw it used in a Tessco catalog), but I'm quite certain that the current Laird/Cushcraft products

RE: [Repeater-Builder] Sinclair - big price jump?

> What didn't go way up? The number of digits to the left of the decimal point in my checking account balance hasn't gone up. I'm still waiting for all of that stimulus package trickle-down money that our new president promised me. Jumping in price by 50% over the course of a few years seems kin

RE: [Repeater-Builder] Sinclair - big price jump?

ne of their seminars and was very > impressed with the construction and workmanship. > > > Thank You. > John > Installer/Tech Midstate Communications > 1st Lieut, S.T.V.F.D. > KB3DOL > www.midstatecomm.com <http://www.midstatecomm.com> > http://stvfd.homestea

RE: [Repeater-Builder] Re: Looking for 220 Repeater Antenna

For fiberglass, RFS still makes the SuperStationmaster for 220 (model # 220-8). Telewave (ANT220F6) and Sinclair (SC229 series) also still make fiberglass omnis for 220. Sinclair (SD212, SD214, SD218), Telewave (ANT220 series) and Comprod (87x series and 88x series) make 220 dipole arrays. AFA

[Repeater-Builder] Sinclair - big price jump?

I was about to order some Sinclair dipole arrays for upcoming projects (SD318 series 8-bay UHF). Last time I ordered one, probably 5 or 6 years ago, I thought it was around $1400. This time, all of my usual vendors are giving me quotes over $2,000???!? Did Sinclair have a big price jump over th

[Repeater-Builder] Need Delta preamps

I'm looking for preamps for GE Delta-S radios, both highband and UHF. Can use a few of each. Yes, I know I could graft in a different preamp, but I'm looking for original parts. 19C850692G3 UHF 19C850696G3 VHF Have stuff to trade or cash. --- Jeff WN3A

RE: [Repeater-Builder] Directional repeater antenna question

> > I am looking for a UHF antenna design to null out > transmissions roughly in an easterly direction, but I would > like to keep the antenna as unsightly as possible since it's > located on a building where it could be easily seen, not on a > tower where it wouldn't matter. Any websites out

RE: [Repeater-Builder] Connector plating vs PIM etc.

> OK, I guess it's about time I asked this. Is there someplace I can > find a reference on various connector types (plated or not, type of > plating) vs PIM/IMD/noise in duplex systems and/or in high RF > environments? I am looking at replacing my run of LDF5-50A and > wonder what type of conne

RE: [Repeater-Builder] Desense on High Power Linear Repeater?

> This leads me to a question that I have had on my mind. How > are people > doing desense testing with D-Star systems? (Remember, it's digital.) > > 73, Joe, K1ike How about this - record a clean D-Star transmission (not decoded, just the "raw" output from an FM receiver) on a PC with a good

[Repeater-Builder] Dayton

Our group (WN3A, KA9FUR, KA3LAO, N9QOO, et al) will be in spaces 2368-2370 this year (different spots than previous years for those that stop by annually). Stop by for 807's and good deals on repeater related stuff. --- Jeff WN3A

RE: [Repeater-Builder] High Power Mastr II base station conversion to 2 meters

> OK GE Mastr II experts, I have a question for you. Our club > has been the benefactor of a local law enforcement agency's > upgrade. We have acquired a VHF (155 mHz) Mastr II base > station with 3 solid state PAs that total a rated output > power of 225 watts. It appears to have a single PA p

RE: [Repeater-Builder] Where can one get VB-11 and VB-83 coax?

> Are you referring to trichloroethylene, or to trichloroethane, or to > trichlorotrifluoroethane, or to something else? They are > definitely not the > same solvents, and they have different applications. Some > solvents whose > chemical names begin with "trichloro" are quite toxic and have hig

RE: [Repeater-Builder] Where can one get VB-11 and VB-83 coax?

> > How are you soldering the braid (or how are you removing the > goop prior > to soldering it)? > > Ed Yoho > W6YJ I use trichloro, but there are other solvents that would probably work too. --- Jeff

RE: [Repeater-Builder] Where can one get VB-11 and VB-83 coax?

> Is there a source for VB-11 and VB-83 coax out there? > > Or is there an equivalent cable from someone else? and of > course what were the impedances and constants and the like of them? > VB-11 is a flooded-braid version of regular RG11 (VB = "VaporBlock" in Decibel's vernacular). Be car

RE: [Repeater-Builder] Repeater ID Enforcement

You're probably looking for this one. http://www.fcc.gov/eb/AmateurActions/files/2007_04_12_10_26_52.pdf --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike > Besemer (WM

RE: [Repeater-Builder] Wanted N type T connector

> I've been reading up on > "How to Modify a Sinclair Q2220E 132-174 MHz Duplexer to 220 MHz" > as Dave C has done. > > Where/who supplies these connectors.. > > 73 John > VK4JKL IRLP 6163 Delta Electronics - www.deltarf.com http://www.deltarf.com/results/p60.pdf ---

RE: [Repeater-Builder] Celwave 633-6A-2N Tuning down to 441 / 446

> I suppose one could dismantle a dash 1 duplexer to see what > the difference > is that makes it work so well on 440, and then use that knowledge to > field-modify a dash 2 duplexer- or better still, publish that > information > for the benefit of others. Any takers? > > 73, Eric Lemmon WB6FLY

RE: [Repeater-Builder] Re: Anyone got a Amp-meter Circuit to Repeater Controller for Telementry Readback?

The classic textbook method would be to put a current shunt in series with your DC source and measure the voltage drop across it. A current shunt is just a precision low-value resistor capable of handling the thru-current, nothing fancy about it. But, at low voltages (like 12V) and low current

RE: [Repeater-Builder] Re: CPI Tone-Remote system configuration

> If you don't have a telco metering setup (line-man, transmission > line tester "tims") the levels across the phone line can be > read with any decent AC volt meter. Just be careful, some DMM's, even good ones, don't have accurate AC voltage measurement above a few hundred Hertz. I have a

RE: [Repeater-Builder] Decibel dipole array sweeps

> > Did you test the db408 with both db404's harnessed and > working together? No, I tested the upper and lower halves seprately. I have some used DB408's (not the dual version) that I'll try to sweep later.

RE: [Repeater-Builder] Latest RFS Brand Antenna (country of mfgr)

> Installing a VHF base station using a brand new RFS Cellwave > Omni Antenna. The label says the antenna is now made in Denmark. > > Appears to be very well made... just interesting to learn it > was made in Denmark. > > cheers, > s. That's odd, last week I picked up a case of Carlsberg p

RE: [Repeater-Builder] What is this antenna???

> But the feed harness would be a bit more difficult for 6 > pairs (or 6 single > elements). Nah, not really. You can power-divide into any number of branches, there's nothing sacred about multiples of two's. > And, the original post indicated he had an antenna that had 6 single > elements,

RE: [Repeater-Builder] What is this antenna???

d that they went to tubing earlier than > the 80's, but my earliest Decibel antenna was around 1978-81 > (they used tubing), so I can't say with any certainty. > > Chuck > WB2EDV > > > > - Original Message - >

RE: [Repeater-Builder] What is this antenna???

If the elements are flat (not tubing), then it's a DB410. They stopped making them probably in the early 80's? --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of k5in

RE: [Repeater-Builder] supply

I was going to guess Motran, but it's been so long since I've seen one I can't be sure. Take the paper target and the power supply out to a rifle range and go "Office Space" on it. --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com

RE: [Repeater-Builder] Re: Sinclair Q2220E

Are you using the PM exciter or PLL exciter on the M2? If PM, switching to PLL will reduce the transmitter noise supression requirement of your duplexer by 22 dB. Otherwise, your best bet is to add another pass/reject cavity to each side of the duplexer closest to the repeater equipment (i.e. do

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

> Jeff, > > I know you know more about this than I do; maybe you can tell > me why I've > seen this. In the past, I've modeled a simple 4el yagi to > answer this same > question for myself: does a conductive mast, placed behind > the reflector > element, affect the yagi's pattern or feedpoin

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

rter-than-standard mast as long as it still meets the > above condition. > > Chuck > WB2EDV > > - Original Message - > From: "Jeff DePolo" mailto:jd0%40broadsci.com> > > To: <mailto:Repeater-Builder%40yahoogroups.com> > > Sent: Wednesday, March

RE: [Repeater-Builder] Decibel DB-4076

If it was originally a 450-470 MHz model, it will work fine at 444/449 without any modifications. If it was for one of the other bandsplits, then you'll need to re-do the harness if you want it to meet spec. --- Jeff WN3A > -Original Message- > From: Re

RE: [Repeater-Builder] Decibel dipole array sweeps

> Hi Jeff, that's interesting data. > > I was more curious whether or not you had any antennas easy to add to > the tests, or any locals nearby with different types of Sinclairs > around/available to add to the data while you "have the test range > setup", so to speak. > > Not important enough

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

es it > really matter when it is 140ft in the air, 40 inches off the > side of a tower? > > Brian, k5in > > - Original Message - > From: Jeff DePolo <mailto:j...@broadsci.com> > To: Repeater-Builder@yahoogroups.com > <mailto:Re

RE: [Repeater-Builder] Decibel dipole array sweeps

Bob. Always the trouble maker. Try this HTML version. It was produced by Microsoft Word which has the most god-awful HTML generator on the planet IMHO. I make no guarantees as to its readability. http://www.broadsci.com/AntennaSweepsR1.htm --- Jeff WN3A > -

RE: [Repeater-Builder] Decibel dipole array sweeps

> > Free space doesn't have a ground. Can you disable ground altogether > > and see what the gain and pattern is? > > Yes. It looks like what you'd expect a perfect antenna to look like. > > > What does it give you for the gain of a single half-wave > dipole with > > no ground or support struc

RE: [Repeater-Builder] Decibel dipole array sweeps

> On Sun, 22 Mar 2009, Jeff DePolo wrote: > > Wait. You're saying that a center-fed dipole has a major > lobe that's > > not exactly perpendicular to the element? Something's amiss. > > It's a theoretical antenna over a real ground. In free space,

RE: [Repeater-Builder] Decibel dipole array sweeps

> along with it. > > Chuck > WB2EDV > > - Original Message - > From: "Jeff DePolo" mailto:jd0%40broadsci.com> > > To: <mailto:Repeater-Builder%40yahoogroups.com> > > Sent: Sunday, March 22, 2009 7:11 PM > Subject: RE: [Repeater-Builder] D

RE: [Repeater-Builder] Decibel dipole array sweeps

r-buil...@yahoogroups.com] On Behalf Of Nate Duehr > Sent: Sunday, March 22, 2009 6:52 PM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Decibel dipole array sweeps > > > On Mar 22, 2009, at 12:32 PM, Jeff DePolo wrote: > > > The antennas I tes

RE: [Repeater-Builder] Decibel dipole array sweeps

> I'm modeling a half-wave dipole with the bottom .25 wavelength (at > 145MHz) above zero, with five meters added from the bottom. This > antenna, five plus meters above ground, shows that when > transmitting at > 165MHz, the highest point of gain is a lower degree of elevation than > when t

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

Re-reading your message about downtilt antennas brought back a distant memory. I was putting up a new 440 ham repeater, and grabbed a used DB408 out of the stash, checked the tag, and it said 450-470 MHz. A quick sweep on the Sitemaster looked fine, so off I went. A few hours later I get to the

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

I'd be interested in seeing what you have. Back in the old days of Decibel, they would send you good info if you were able to get to the right person. I haven't had that kind of success since Andrew bought them out. Just this week I came across a non-catalog Decibel antenna on a tower (the one w

RE: [Repeater-Builder] Decibel dipole array sweeps

In general, the loss in the feedline will only make the return loss look better. If you have an antenna with a 14 dB return loss at the frequency of interest at the feedpoint, and connect it to a feedline that has 2 dB of loss, the return loss will be 14dB + 2 x 2dB = 18 dB looking into the trans

RE: [Repeater-Builder] Decibel dipole array sweeps

It wouldn't suprise me if the VSWR wasn't terrible since you'd be operating the antenna at an odd multiple of its original design frequency. However, the elevation pattern will likely be a mess. In other words, it may look just dandy on the Sitemaster, but under-perform by a whole lot out in the

RE: [Repeater-Builder] Decibel dipole array sweeps

The link in Doug's email below still has spaces in it (%20 hex ASCII for space character). Use the revised name I sent out that doesn't have spaces in it: http://www.broadsci.com/AntennaSweepsR1.pdf --- Jeff > -Original Message- > From: Repeater-Builder

RE: [Repeater-Builder] Decibel dipole array sweeps

nd > radiation > pattern looks like at frequencies out of it's design range. > > 73, Joe, K1ike > > Jeff DePolo wrote: > > I tested these antennas with them mounted above ground > level, and away from > > nearby objects, with the Sitemaster connected

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