n...@no6b.com wrote:
At 3/22/2009 11:32, you wrote:
The document can be found here:
http://www.broadsci.com/Antenna Sweeps r1.pdf
I get a The file is damaged could not be repaired error.
And I get a 404 Page not found error.
Paul
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 WA6ILQ wrote:
The word
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 visit your group on the web, go
to see
what happens.
Paul N1BUG
Phillystran guys when I can come up with the $$$ to do it.
I appreciate the input from everyone on this problem.
Paul N1BUG
of trouble!!!
Paul N1BUG
147.105 and 444.950
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
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
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
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
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! grin
LDF5-50A runs up the tower, RG-214 mil spec double silver shield for
all jumpers.
Paul
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 of
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
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) ?
How
).
Paul N1BUG
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
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
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 http://www.nab.org shows no stations below ch 7.
Buddy KS4QA
I only wish it were so. If you are referring to:
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 channel 2 assignment. I'm curious... does anyone know
whether DTV will be more (or less
ham radio transmissions than analog TV?
Thanks 73,
Paul N1BUG
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
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 where, I'll let you know.
Did you have trouble with the top of the inner
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 got them totally pulled apart. Both
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 settings:
Individual Email | Traditional
unturned).
Good luck!
73,
Paul N1BUG
.
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 settings online go to:
http://groups.yahoo.com/group
, the following LBI is also relevant...
http://repeater-builder.com/ge/lbi-library/lbi-31209g.pdf
Paul N1BUG
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 have some experince
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
. 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
duplexers for 2m
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
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, and
Sept 2000
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 a
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
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 for 2 meters Ham repeater.
TX noise suppression
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:
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
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
Paul N1BUG
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
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 chain. He reported
was done
and the results, or maybe even write up an article about it.
73,
Paul N1BUG
out the bottom... solder the rod to the plunger top end plate, screw
it back into the cavity and put a new knob on it.
Any thoughts, please
Paul N1BUG
Thanks Scott,
I really appreciate the reply!
I find it extremely strange the knobs are soldered on also. You're
probably right, although these knobs sure look identical to the ones
in all the old Decibel Products catalogs, etc. But these knobs have
NO holes for set screws or anything of the
, but there isn't enough clearance to allow
overlapping the ends at all. Also it might not stay put or hold up
well with time and vibration.
I still can see no other possible source of the noise/desense in
this cavity.
Paul N1BUG
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 each other
is that the invar plunger
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 N1BUG
Nate Duehr wrote
position.
73,
Paul N1BUG
Dan,
If you and the group will pardon a somewhat long response, let me
offer some thoughts. I think you said you were not particularly
radio literate and it appears you aren't really understanding the
difficulty with what you propose to do. I will attempt to explain.
I am trying to find a DC
The spec sheet says 0.8 dB insertion loss for 5 MHz tx/rx separation.
Paul
Shane Autrey wrote:
I have just purchased a set of DB4072-A UHF DB products cans. I need to
know what the insertion loss is on these from the manufacturers specs.
Can anyone help me? I need this for my repeater
Ian Wells wrote:
Would anyone have some sugestions on reducing desense fading in and out
on a repeater.some information sugests checking out the antenna system
.any sugestions?
As has been suggested, try running the repeater only from batteries
with all power supplies, charge controllers
Thanks Harold.
I'm not sure how the current version harness is done either.
Sinclair sent me a diagram for the current model 235-2, but both it
and the one that came with my older (1998) version are very poor
when it comes to showing any details like that. It looks like
(maybe) the current
So how can a scanner interfere with a repeater? I'm probably missing
something basic but thought I'd ask anyhow.
Given the original description of the problem Mathew has been asked
to help solve, I doubt a scanner is the problem - hence I'm changing
the Subject header...
The local
I have a spec sheet now, thanks.
Any chance I can get a copy of that or some info quoted from it so I
can add it to the next revision of:
http://www.repeater-builder.com/rbtip/duplexerspecs.html
You can contact me direct using the following address.
paul_n1bug (AT) verizon (DOT) net
Paul
I dunno... but for what it's worth I will share my experience. 7
years ago I tried a new-out-of-the-box G6 on my 2m repeater and had
major trouble with it. I had loud crackling in even a moderate wind.
Completely unusable in duplex service. I replaced it with
something else, but last year I
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