Re: [Repeater-Builder] Moisture/condensation

the temperature dropped. It must have been a rather uncommon set of circumstances since it just happened that one time. It's hard to believe there could have been enough moisture in the air to form so much frost! Paul N1BUG Paul Plack wrote: > Wow...sounds like somehow, moisture was

Re: [Repeater-Builder] Moisture/condensation (was: Duplexers)

he frost slowly vanished, not so much by melting and forming water but by dissipating into the air. Everything returned to functioning normally. The funny thing is, it never happened before or since. Just that one time. I never did figure out exactly what conditions caused it. Paul N1BUG

Re: [Repeater-Builder] Silver Plating - Cheap & Easy

of. I wish I had saved that article, and would like to read the earlier ones on silverplating too. Actually I did save that issue for years but eventually lost track of it. May still be in a forgotten/buried box from my last move... Paul N1BUG Yahoo! G

Re: [Repeater-Builder] Silver Plating - Cheap & Easy

doing) improvement in efficiency and power output. Paul N1BUG George Henry wrote: > > > It's actually used photographic FIXER that contains a lot of "free > silver"... > the fixer removes any unexposed silver in the film emulsion. For many > years I > rec

Re: [Repeater-Builder] Sinclair dipole phasing harness

already had several repeaters sitting idle, I'd have walked away from it in frustration long ago! Paul N1BUG Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your

Re: [Repeater-Builder] Sinclair dipole phasing harness

nce to the exact velocity factor of RG-63B/U. It sounds like you have some very interesting (and rare) Sinclair documentation there! Paul N1BUG Larry Horlick wrote: > > > On the drawing it does not show any 125 ohm cable, but I think what you > are saying is that > from th

Re: [Repeater-Builder] Sinclair dipole phasing harness

doing it, perhaps depending on the exact model. Or maybe they changed the harness design at some point. Paul N1BUG Larry Horlick wrote: > > > I have a drawing from Sinclair that shows 4 stacked folded dipoles (it > does not indicate an > antenna model) using all 50 ohm cabl

Re: [Repeater-Builder] Sinclair dipole phasing harness

ears to be just a quarter wave section of coax off each side of point Z to the "T" for each pair of dipoles. I don't know how that was physically possible given the dipole spacing. I think we can safely assume I'm missing something here. :-) Paul N1BUG -

[Repeater-Builder] Re: Sinclair dipole phasing harness

be able to take pictures. Paul N1BUG wrote: > Me again. I just got "handed" a potential project. > > I am looking for information on the phasing harness for Sinclair VHF > 4-bay dipole arrays with the coax inside the mast. I want to know > types of coax and lengths so I can

[Repeater-Builder] Sinclair dipole phasing harness

the same time convert the antenna from bidirectional to cardioid pattern. I would be constructing my own harness. I think this might be possible, if I can find out how the phasing harness for the SRL214/cardioid version was made. Any info out there? Paul N1BUG

Re: [Repeater-Builder] Re: CTCSS Encoder/Decoder

73, Paul N1BUG ae6zm wrote: > > > > > I think this thread has clearly demonstrated that there are a couple > different groups involved in building/maintaining repeaters. Those who > are involved in commercial systems are likely best served by purchasing > commercia

Re: [Repeater-Builder] IDEA? Re: Micor PL encoder modification (TLN5731A)

the RLC-4 controller. Needs some research. I'm not sure I understand exactly how some of the event triggers (029-044) work (or rather exactly what triggers them) but I will ask and/or figure it out. Paul N1BUG Don Kupferschmidt wrote: > There was an earlier post concerning grounding a pi

Re: [Repeater-Builder] IDEA? Re: Micor PL encoder modification (TLN5731A)

Thanks Jeff! Having someone to kick this around with is helping. Very good point about the ratty user signal. I hadn't thought of that. You are exactly right. I need to make sure the controller is set up to always keep the transmitter up for a short time after loss of user signal on the repeat

[Repeater-Builder] IDEA? Re: Micor PL encoder modification (TLN5731A)

My original plan was to let the transmitter PTT control the Micor encoder board as usual, but supply a "valid user signal present" logic input to abruptly stop the tone when there is no user signal present... thus allowing the controller to keep the transmitter keyed for IDs without PL tone. Th

Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)

That's right Leroy, reverse burst was invented to overcome the problem of tone decoders being relatively slow to realize the tone went away and thus producing a somewhat long burst of noise before muting the speaker. Paul Leroy A. M. Baptiste wrote: > > > Hi Paul, thanks, I think that answ

Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)

Tony KT9AC wrote: > > Would this still allow the reverse-burst to pass through, or just > abruptly cut off? >> > Pin 701 on the board (base of Q704) is PL Inhibit - pull to ground >> to kill >> > the encoder. Grounding pin 701 would kill the tone entirely, including reverse burst. Which is wha

Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)

Leroy A. M. Baptiste wrote: > I have a question for the group. What is reverse > burst? And when is it used? Motorola radios. Leroy, I'm sure others can explain it better, but... Reverse burst was / is used by Motorola and others to eliminate "squelch crashes" at the receiving end of a comm cir

Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)

N1BUG wrote: > Squelch tails are *probably* not going to be much of an issue since > I plan to use AND squelch with PL and the infamous Micor carrier > squelch at the receive end of the link. DUH! Not my best day... Looks like I will end up killing squelch crashes with an audio dela

Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)

wd8chl wrote: > The usual method we've used is to pull it to ground when you don't want > tone with a transistor or a FET. You can remember though that, depending > on your link rx, letting the Micor encode reverse burst will close the > squelch quicker than just letting it coast. My experience is

Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)

Jeff DePolo wrote: > Pin 701 on the board (base of Q704) is PL Inhibit - pull to ground to kill > the encoder. Thanks Jeff, I did notice P701 on the schematic. Any experience on whether a transistor will pull it low enough or do I need something better? Guess I'll try a transistor and see what

[Repeater-Builder] Micor PL encoder modification (TLN5731A)

PL on/off gate on the TLN5731A encoder. The only tone gate is Q703 which only gates the out of phase tone used for reverse burst. Other than using a mechanical relay to interrupt the encoder tone output, any suggestions? Thanks, Paul N1BUG

Re: [Repeater-Builder] What's the point of the PL input on the RLC4?

command 005 you can set receiver and DTMF decoder access conditions. If you want to require both COR and PL for both repeater access and to send DTMF commands to the RLC-4, the proper command would be 005 1 3 3. Paul N1BUG Mike Lyon wrote: > > > Howdy, > > This may sound like

Re: [Repeater-Builder] information requested re broadband internet canopy equipment interference

instances of similar problems at nearby sites that were cured by replacing a switching power supply on the Canopy stuff. I'm assuming mine won't be that easy since it appears to be intermod not just switching PS crud. Paul N1BUG ve1ii wrote: > Hi, > > I would like to hear of an

[Repeater-Builder] Isolator vs intermod panel?

? If one has a high power tube PA on a repeater, I assume he would need to use a high power isolator or intermod panel after the PA? Or would it be sufficient to use a lower power one between the solid state exciter and tube PA? Thanks... Paul N1BUG

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

RL235-2 pattern, where with a free space array I would expect to see fairly deep nulls in-line with the dipole pairs. But who knows... it has to be a rather complex situation. 73, Paul N1BUG Jeff DePolo wrote: > Now you have me second-guessing myself. > > Over-simplying greatl

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

to back up this statement. Paul N1BUG Jeff DePolo wrote: > 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. >

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

s... an old fiberglass collinear that had gone bad, and a new Sinclair dipole array that apparently had issues from day one. Everything is running *perfect* with the single dipole I threw up on the tower. Paul N1BUG

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

y busy weekend and am still digesting some of the info, but I will come away with a much better understanding of the subject. The bottom line for me is probably this is something I don't need to worry about. It is a low RF site and I have just one transmitter. Paul N1BUG

[Repeater-Builder] Connector plating vs PIM etc.

and why? What about mating connectors with different plating? If a repeater is in a very low RF environment, does it even matter? Thanks! Paul N1BUG

Re: [Repeater-Builder] Re: Sinclair dipole array premature failure (noisy)

friendly. Yep... that darn 8-bay was HEAVY. Ya don't even wanna know how that was installed! Er... or I'm afraid to tell anyone for fear they'd wanna have someone who shall remain nameless committed! ;-) Paul N1BUG

[Repeater-Builder] Testing the Sinclair dipoles

take a chance on using some of these dipoles and building my own harness to make a 4-bay in-line array or scrap the whole thing and buy another antenna. The first option is much cheaper but if it doesn't work it would end up being money thrown away. Paul N1BUG

Re: [Repeater-Builder] Re: Sinclair dipole array premature failure (noisy)

maybe (depending on how it was done) reduce weight and wind load. When (if?) I recover from blood loss to black flies at the repeater site today, I will report on my findings testing individual dipoles from the problematic array Paul N1BUG skipp025 wrote: > Note the problematic Sinclair VH

Re: [Repeater-Builder] Re: Sinclair dipole array premature failure (noisy)

ill keep digging for old posts on the subject... Paul N1BUG skipp025 wrote: > There are known problems with this series of antennas... see > my previous posts bad-mouthing Sinclair regarding this same > situation. > > I was only told that Sinclair has reworked the model and the >

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

near-field noise maker - rusty > bolt, guy wire, etc. It is at the same location, but is not mounted with the same hardware. Paul N1BUG

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

started getting worse. Paul N1BUG Ed Yoho wrote: > Paul, > > One test I have not noticed listed is if you've tried the Sinclair while > it was not attached to the tower (and a reasonable distance away from > anything that could affect it). > > Ed Yoho > W6YJ

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

o a brief test duplexed into each of the other dipoles pulled from the Sinclair, but no go. Maybe tomorrow. Paul N1BUG Nate Duehr wrote: > A TOTALLY crazy idea Paul... > > Just going off of your comment that it "gets better" when you split > antennas but is always th

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

n the tower, and there is no noise at all with that arrangement. My gut tells me this is a rusty bolt / bad connection kind of thing, but it goes away when the Sinclair isn't on the tower. I know that doesn't prove anything, but I have no idea where else to look other than the Sinclair antenna. I'm open to suggestions. Paul N1BUG

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

ery and have no idea what was wrong. Meanwhile the repeater continues to be 100% perfectly free of noise on the single dipole from this array. It was never this good with the whole SD2352 up there... not even on day one. Paul N1BUG Chuck Kelsey wrote: > Or the white, powder "residue."

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

the original harness for inspection. I will also test each of the dipoles on the repeater individually to check for noise. If I do not find any problems in either of these processes, then I will have no clue what caused the problem! Paul N1BUG

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

t. It was very noisy during all this testing, but not much more or less so than at any other time. Paul N1BUG Gran Clark wrote: > > > Paul > > I have recently had to deal with the same problem. Note if the noise > goes away when the antenna is wet for frozen. If this is

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

e becoming too noisy was less than a year! Paul N1BUG Burt Lang wrote: > The matching section inside the loop is a 1/4 wavelength of RG-63B 125 > ohm coax. The overall outside diameter is the same as RG-214 but the > dielectric is semi-air (like a large version of RG-62 93 ohm coax

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

matching section were anything but water tight. I added waterproofing (butyl rubber and tape) in which I had total confidence but now paranoia is making me doubt myself. :-) I will rip into it today. Paul N1BUG Chuck Kelsey wrote: > > > Paul - > > Were the U-bolts that attach each

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

oing noisy within a short time after installation, please chime in. I would really like to understand the issues with this. Paul N1BUG Chuck Kelsey wrote: > Sounds like something in the harness went intermittent. To get at the inner > element connection, you'd need to cut the shrink tub

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

-214 in an attempt to build a noise free harness. But if there's a matching section, I'm sure the return loss without it would be really ugly. Paul N1BUG Chuck Kelsey wrote: > There is a 1/4 wave impedance matching section of coax (125?) inside the > element. The matching section

Re: [Repeater-Builder] Sinclair dipole array premature failure (noisy)

Mike, Thanks. That is interesting. I don't recall hearing about this with dipole arrays before. What is the failure mechanism? Deterioration of the coax due to repeated slight flexing? The antenna was supported bottom and middle. Paul N1BUG Mike Mullarkey wrote: > &

[Repeater-Builder] Sinclair dipole array premature failure (noisy)

a somewhat reactive bump in between). 73, Paul N1BUG

Re: [Repeater-Builder] Adding Extra Cavities to Duplexer

e the same connector types also. And if there are T connectors on the cans, use the same type. Good luck and let us know your results when you're finished! 73, Paul N1BUG David Struebel wrote: > > > I have a Phelps Dodge 506-1 four cavity duplexer. Just recently picked > up two

Re: [Repeater-Builder] Ham installation quality/non-quality

ing towers (installed that way), RG-58 jumpers, etc. etc. And then they complain about having intermod and can't figure out why!? It really annoys me to think they get paid to put up such crap. Paul N1BUG mwbese...@cox.net wrote: > Got one like that here too. It ain't just the hams that

Re: [Repeater-Builder] Re: W1GAN and square duplexers aka homebrew duplexer

I'd like to get a scan of that ARRL antenna article for the antennas > page (repeater-builder has permission from the ARRL to post PDFs of any > articles in QST or their books). I think this may be the one he was referring to: <http://www.repeater-builder.com/projects/exposeddipole.html> 73, Paul N1BUG

Re: [Repeater-Builder] Remote receiver "suicide" control

use an old IMTS horn honker decoder to trigger the trip coil. Do you recall how much power they consume? I'm leaning toward the Selectone ST-809B for its negligible power consumption. My working theory is that (within reason) it's cheaper to spend money on low power consumption electronics than to buy more solar panels. :) Paul N1BUG

Re: [Repeater-Builder] Remote receiver "suicide" control

fuse or circuit breaker did occur to my feeble mind, but I wanted see what others could come up with for ideas. Paul N1BUG

Re: [Repeater-Builder] Re: Remote receiver "suicide" control

Randy, I will be using a small repeater controller. What I want is some way to kill power to everything in the box... receiver, link transmitter, controller, the whole works. This would be a last resort in the event something fails in such a way that it is critical to shut it down, at a time w

Re: [Repeater-Builder] Remote receiver "suicide" control

e better ways to handle it. Paul N1BUG Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email settings: Individual Email | Traditional <*> To change setti

[Repeater-Builder] Remote receiver "suicide" control

how to implement a suicide command for such a remote package? I can think of a couple ways to do it but usually someone here has better ideas than mine! 73, Paul N1BUG

Re: [Repeater-Builder] Decibel dipole array sweeps

n...@no6b.com wrote: > At 3/22/2009 11:32, you wrote: > >> The document can be found here: >> >> > > I get a "The file is damaged & could not be repaired" error. And I get a 404 Page not found error. Paul

Re: [Repeater-Builder] Re: LMR-400 and Belden 9914 "DuoBond"

Thanks Mark and Mike! The great news is there is a tremendous amount of good information at the repeater-builder site. The less-great news is I'm an idiot and can't always find what I'm looking for. ;-) I appreciate the help finding this stuff. Paul N1BUG Mike Morris WA6I

Re: [Repeater-Builder] Re: LMR-400 and Belden 9914 "DuoBond"

se? I would VERY much like to see it before Monday, for reasons I won't go into right now... I did find something on the subject by Andrew but since they make Heliax that likely won't help my case. Paul N1BUG Yahoo! Groups Links <*> To

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

t will be interesting to see what happens. Paul N1BUG

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

x27;t find any specific problem areas, I'm leaning strongly toward trying Phillystran guys when I can come up with the $$$ to do it. I appreciate the input from everyone on this problem. Paul N1BUG

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

>> Topside jumper and the jumper between duplexer and feedline were >> replaced. > > What kind of jumpers? RG-214/U. The good type, with all conductors silver plated. I use it for all jumpers in the repeater system. Paul

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

> What type of power supply is in your system? Do you have a back up > battery? If so what type of charger is on it? Any other repeater > systems in close proximity? There is a backup battery which is float charged from the 13.8V DC power supply. Presently the supply on duty is a homebrew beast

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

> Also, I'll ask the dreaded question... You are not using any foil/braid coax > (LMR-400, 9913, etc.) for any jumpers are you? Nope, won't allow the stuff near my repeaters! LDF5-50A runs up the tower, RG-214 mil spec double silver shield for all jumpers. Paul

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

Hi Randy, I remember working you on 2 meters. That is very interesting. I tried bonding all the joints. If anything it actually seemed to make things worse!? I have been seriously thinking about Phillystran. It's a big expense not knowing for sure where the problem lies, but the only way to fi

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

> Have you tried putting one or more pass cavities on the transmitter? It's > more of a longshot, but if there's something strong coming back down your > feedline it could be getting to your PA resulting in intermod. The problem > would come and go with the strong signal obviously, and only when

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

Great questions, Jeff. Thanks! Answers below... > Have you looked at the > transmitter output with a spectrum analyzer during the occasions when you > have desense to see if it's getting sloppy? No. I wanted to but I'm very isolated up here and do not have access to one. > Have you tried other

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

Thanks Chuck. What would you consider nearby? There is one fiberglass antenna on a tower 60 feet away. It was new when it went up 2 years ago, but my problem existed before that tower/antenna went up. Aside from that the nearest other fiberglass antenna (or antenna of any kind) is 250 feet awa

[Repeater-Builder] Quieting duplex noise from a tower

run the antenna on a rusty metal mast with loose fitting joints without ever a hint of trouble!!! Paul N1BUG 147.105 and 444.950

Re: [Repeater-Builder] OT DTV

Yup. Woefully inaccurate (too optimistic) for my location too, but after zooming all the way in I am impressed with their terrain data. :-) Chuck Kelsey wrote: >  > I just checked this against my location and the results were woefully > inaccurate. > > Chuck > WB2EDV > http://www.fcc.go

[Repeater-Builder] Re: 900 MHz WISP on repeater tower?

ro control). Paul N1BUG

Re: [Repeater-Builder] 900 MHz WISP on repeater tower?

Kevin Custer wrote: > Ethernet cabling should be of the shielded type and bonded at one end to > earth. > If they are putting up a 900 MHz access point, will it be sectorized? > If yes, how many sectors (how many transmitters)? > What frequencies and bandwidths on 900 (20 MHz) (10 MHz) (5 MHz) ? >

[Repeater-Builder] 900 MHz WISP on repeater tower?

rence issues between their stuff and my repeaters. I'm going to be setting up a meeting to discuss technical aspects of the proposed system, but I have no experience or knowledge in this area and am not sure what questions I should be asking them. Any suggestions or advice? Thanks! Paul N1BUG

Re: [Repeater-Builder] DTV ch 2 vs 6m

Thanks everyone for the comments on this topic. I will report back later and let you all know how DTV 02 and 6m get along. Paul N1BUG

Re: [Repeater-Builder] DTV ch 2 vs 6m

r digital transmitters, more. > > Joe M. > > Paul N1BUG wrote: >> I think this is on topic for the list since it could affect some 6 >> meter repeater owners. >> >> After transition I will have a "local" channel broadcasting DTV on >> their low VHF ch

Re: [Repeater-Builder] OT: digital TV channels

Buddy Case wrote: > It is my understanding there will not be any channels between 2 thru 6 > anymore. The govt proposes to auction these frequencies. Checking the > list on www.nab.org shows no stations below ch 7. > Buddy KS4QA I only wish it were so. If you are referring

[Repeater-Builder] DTV ch 2 vs 6m

terference from ham radio transmissions than analog TV? Thanks & 73, Paul N1BUG

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

I TRY not to respond to OT posts, but boy am I fed up with DTV! I could get all the high power analog stations in my market snow-free with a small rooftop antenna. No go with DTV so I've been incrementally upgrading. I now have a very large antenna residing at 70 feet on one of my towers. Now I

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

making the impedances look a little nicer or some such... Paul N1BUG Mike Besemer (WM4B) wrote: > Paul, > > I just noticed that what I wrote here was backwards... the 004s had the > strap all the way around and the 005s had the wire extension. > > If I figure out what goes whe

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

built like your 005's... strap all the way around the loop. Were your knobs also soldered on? Fun, aren't they... Good luck with the cleaning. Hopefully it will help! 73, Paul N1BUG Mike Besemer (WM4B) wrote: > Paul, > > > > I got the knobs off two of them and g

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

ut I wasn't leaving any stone unturned). Good luck! 73, Paul N1BUG

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

menu etc. if you want it) Almost one year since the restoration now and all's well... 73, Paul N1BUG Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email setti

Re: [Repeater-Builder] RE: DB4060 Duplexer Cables

do that would put undue strain on them. Paul N1BUG Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email settings: Individual Email | Traditional <*> To chang

Re: [Repeater-Builder] PLL UHF EXCITER

citer you have, the following LBI is also relevant... http://repeater-builder.com/ge/lbi-library/lbi-31209g.pdf Paul N1BUG

Re: [Repeater-Builder] db 4060 high band

ning plunger. I also disassembled all the coupling loop assemblies and cleaned all mating surfaces. The duplexer is working perfectly now, with the caps being very smooth and stable. I am also getting deeper notches than I had before. Paul N1BUG Joel Hall wrote: > Hope some of you guys that h

Re: [Repeater-Builder] Build your own

like them). > Anything else I should be wary of? As has already been mentioned, no foil/braid coax cables, and forget the single braided shield types too. You really want solid copper shield heliax, or at least mil spec RG-214 (double silver shield) if you don't want noise problems on your repeater. 73, Paul N1BUG

Re: [Repeater-Builder] db products 4060

Dave Gomberg wrote: >> http://repeater.n1bug.com/duplexerrefurb.html > > Great write up, Paul, can you say something about how many hours you > put in on it??? Uh, sure too many! Heh. Seriously, I didn't really keep track but must have been around 15 to 20 hours. Getting some of the parts

Re: [Repeater-Builder] db products 4060

. Rather than typing up a lot of details, let me refer you to something I wrote about this a while back. http://repeater.n1bug.com/duplexerrefurb.html 73, Paul N1BUG Aaron Sloan wrote: > Hello gang, > > I am wondering what the opinion is of the decibel products db4060 > dupl

Re: [Repeater-Builder] Power Supply from a PC. Slightly OT

The May 2002 QST article is available as a members only PDF. Just go to arrl.org and search for "St Louis Switcher". Paul N1BUG kf0m wrote: > May 2002 QST had the computer power supply conversion article > QST switching power supply product reviews are July 2006, January 2000,

Re: [Repeater-Builder] DB4055 Duplexer

Nate, Thanks for bringing that to my attention! That is weird. The info I have in the document came from a Decibel Products catalog. We now have three freq ranges for the DB4076, all from manufacturer documents. Hm. Since "official" info conflicts, I guess all I can (or should?) do is add

Re: [Repeater-Builder] Freak Propigation

Also don't forget about knife edge diffraction of VHF signals over a mountain. I don't have a lot of personal experience here, but in theory I believe this works best if the mountain or ridge has a sharp rocky peak. 73, Paul N1BUG

Re: [Repeater-Builder] DB4055 Duplexer

sted version so it's probably about time to send in an update. 73, Paul N1BUG Ron Wright wrote: > Eric, > > The DB4055 is 5 cavity band reject duplexer from Decibel Products. > > Its notch is 75 to 80 db at 5 MHz. Min freq separation is 5 MHz making it > useless fo

Re: [Repeater-Builder] Re: Antenna Tower

You added www which wasn't in the original link. Try this (it's your first try with www removed) http://good-times.webshots.com/album/562985533mLTuoH 73, Paul Dexter McIntyre W4DEX wrote: > I've tried several ways to put the link together with no success. These > don't work for me: > > http

Re: [Repeater-Builder] Off Topic (but with on topic questions): NTIA propaganda

> While it was told that ALL VHF television would move to UHF, I don't > believe that is going to be reality. I could be wrong, however My local channel 12 is moving to channel 9 with the digital transition... 73, Paul N1BUG

Re: [Repeater-Builder] Re: Duplexers (budget test equipment)

Oops. I forgot to mention double shielded cable for ALL interconnects is an absolute MUST, at least with my duplexer - it has notches in excess of 120 dB deep after refurbishing. It doesn't take much leakage cause problems when you're dealing with notches like that. Paul N1BUG

Re: [Repeater-Builder] Re: Duplexers (budget test equipment)

mercial repeaters (or worse yet mobiles converted to repeater) could be more of a challenge. Paul N1BUG

Re: [Repeater-Builder] Re: Micor conversion question

15 pf and 12 pf in series would give you 6.7 pf, but if you have the space you could put them in parallel and have 27 pf. I'm sure that's what you meant to say. No guarantees on the specific item you're working with but usually putting a couple of caps in parallel to arrive at a needed value wo

[Repeater-Builder] Thanks re DB4062 project

rt on what was done and the results, or maybe even write up an article about it. 73, Paul N1BUG

Re: [Repeater-Builder] DB4062 woes...

. Cavities I've worked on in the past didn't use any paste on the moving parts. 73, Paul N1BUG kf0m wrote: > Hey Paul, another ham in my area had our DB4062 apart earlier this year for > a similar problem lots of rx noise when I wiggled on two of the tuning knobs > in the rx

Re: [Repeater-Builder] DB4062 woes...

ill mess up the silver plating at the bottom somewhat, but I'm not sure I could enlarge the hole by the small drill/file method with the tuning rod stuck right in the way. I'm assuming silver plating at the very bottom is not too critical anyway. Did you use silver solder, or regular solder? Paul N1BUG

Re: [Repeater-Builder] DB4062 woes...

even the notches appear to be quite stable when I tap on it (using test equipment of course). However if tapped with transmit RF present, noise on the receiver is very bad. Two of the six cavities misbehave. The other four seem OK... for now... I hate to chop on these at all! But... Paul

Re: [Repeater-Builder] DB4062 woes...

oks like I need to insulate it somehow. I've been trying for hours to slip a piece of .005" PTFE sheet in that gap but it just won't go. 73, Paul N1BUG IM Ashford wrote: > Paul, > Excellent photos! > > The only reason these two pieces of metal have began touching ea

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