I'm looking for some high stability Mitrek channel elements
to use in
several link and repeater transmitters we have. The part
number is KXN- 1095.
I can use about 15 of these channel elements.
The standard elements we are currently using are not very stable and
allow the
Avoiding it like the plague Sir!!
If you don't go, how are you going to earn any Dayton spending money?
WN3A's Las Vegas motto: There's no such thing as a loser, just winners
that quit too early.
--- Jeff
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at all but one place, and they quoted me $10.50 EACH!???!? Anyone
have a favorite vendor that they could recommend?
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
to the Mastr II PLL exciter,
which represents about a 22 dB reduction in noise over the standard
multiplier Mastr II exciter at 600 kHz T/R spacing.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast
Sounds like an old Cushcraft AFM-4DA array. Bad news.
--- Jeff
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Sunday, March 12, 2006 3:10 PM
To: [EMAIL PROTECTED];
Have a question for the list. Is there an antenna (VHF) that
will cover a 30mhz bandwith? (Reasonably)
There is a system in Georgia incompassing the entire state
using various tall towers. On the towers will be antennas
that will be used for VHF Repeaters and VHF digital. (in the
I would agree the Sinclair Antennas are well built and
very broadband, but I had a horible time with a number
of 4 bay vhf broadband units installed (and removed)
in 2005. We bought a large number of VHF SLR-235
units new. The part number has changed but the antenna
is the same
Anyone have a surplus of Motorola MRF648 UHF power transistors that they'd
sell or trade?
--- Jeff
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Yahoo!
Title: Message
I'm
almost sure it does, as I've used those connectors before on either Andrew or
Cablewave 7/8" foam. If you have an older Tessco catalog (say, from 3 or 4
years ago), I'm pretty sure they had a chart in there that showed which
connectors work on which cable. Most of the
I still contend that in a mobile environment, under motion, that the
user will not detect the 6 dB difference. It will be barely
distinguishable most of the time.
I'm not arguing this point. There have been times when I've had a 75 watt
Micor PA die and I've had to run the output of the
I picked up an electronic load on Ebay a number of years ago, and have
gotten more use out of it than I ever thought I would. Here's a well-done
article on building an electronic load. The general design could be easily
expanded to handle higher current by using a beefier transistor and/or
Did you try the V7A with AIP on?
No, I didn't, but I'll do that later today if I get a chance. The other ham
rig in my truck is the other Kenwood dual bander (TM-708? getting old and
don't remember model #'s like I used to). I'm not sure but I think that has
the AIP function too. I never
I have enjoyed this thread and hope that no one has taken
anything to be any kind of personal attack on how anyone runs their
repeater.
Of course not. No matter how much I or anyone else nit-picks technical
details, it's still supposed to be a fun hobby.
My point was is it needed?
I
No. A typical UHF ham rig will have better sensitivity than most
repeaters with a preamp. A commercial mobile (without preamp)
will have
sensitivity slightly worse than the repeater with the preamp. 99% of
hams will be using a ham rig, not a commercial one.
OK, tell you what. It's
tests and publish the results
if you don't like my methods (or results :-).
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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Subject: Re: [Repeater-Builder] UHF Power
And that's my whole point.
Chuck
WB2EDV
Jeff DePolo WN3A wrote:
I'd be interested in someone actually trying this with a UHF
system that
is running 200+ watts. Drop it to 100 watts without telling anyone
to have.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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I thought consistent and optimum performance were pretty
much the same animal?
Only under lab conditions :-)
Using a vague definition, I'm thinking consistent = best operation over the
long term, optimum = best short-term. I've accidentally made a 75 watt
Micor UHF PA crank out 200 watts
So, if you lack test equipment and have no choice but to use high-
level
signals for tuning the pass, you should still be tuning for minimum
reflected power.
So bird inbetween TX and cans, tuning on a source like an HT?
Yes. To take it one step further, a 6 dB pad (with suitable power
Here's a thought -- if you put a isolator between the PA and
the duplexer,
and a isolator between the duplexer and the antenna, wouldn't your
duplexer see a near perfect 50 ohms at all times?
The isolator in the output of the duplexer would have to
replace the output
TEE - else you
If I take all the opinions I've seen in the last month as fact, then
the pass adjustments on duplexers can't be tuned.
I'll take most of what you said as being sarcastic, but your point is taken.
If tuned with a quality network analyzer, or with a return loss bridge and
high return loss
the driver PA harness built and how are the 2 PAs
outputs combined? Do you have any information or specs on the RF and
matching harnesses and how they are built?
--- In Repeater-Builder@yahoogroups.com, Jeff DePolo WN3A
[EMAIL PROTECTED] wrote:
I am looking at acquiring a GE Master II
I am looking at acquiring a GE Master II UHF Base station. This is a 300
watt solid state transmitter, which how I understand it, has 2 PAs running
in parallel.
It's actually 200 watts, and yes, there are two final PA's, each capable
of 100 watts output, that are combined. However, each final
or 15 degrees ambient as a
ballpark), you might be OK. Next time, spend the money and send the element
to ICM and let them do it right.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast
when
PTT is active. Lookee here:
http://www.repeater-builder.com/rbtip/micorrxintcon.html
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message
Nate,
I'd start by doing some office DF'ing before spending time on the hill
this time of year. My first guess would be local oscillator leakage from
something on the hill. Try doing an FCC ULS database search for anything
within a mile or so of the site, make a list of the Rx frequencies in a
Anyone have a hybrid out of an 800/900 MHz combiner or the like? Needs to
work at 950 MHz. I don't need an entire combiner, just a hybrid. Thanks.
--- Jeff
Jeff DePolo WN3A - [EMAIL
Title: Message
Kitchen dishwashers are also great for cleaning gunked-up mobile radio
accessories like control heads, speakers, mics, mounting brackets, etc.
Remove the speakers, mic elements, PC boards that contain switches, and other
electronics that don't take kindly to water first of
A) not enough hoisting grips were used and b) the cable had pulled away from
the tower in a number of places (a mish-mash of butterflies, tie wires, and
even rope were used to attach it). The end result was that the line
stretched, plus there were several holes in the outer conductor where it
I actually saw an install where a MSS did just that - they
had the ground connected to a plastic water pipe!
Joe M.
I've got a better one. A number of years ago we changed out a 1500' run of
4 Heliax that had gone bad on an FM station. Upon taking down the old line
and looking at the
, then turn the
element around
and measure the
reflected power. Then use 10 log (FP/RP) and you have the
return loss in
dB.
Dick
- Original Message -
From: Jeff DePolo WN3A [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: 21 December, 2005 08:46
Subject: RE
If the PA microphonic AM'ming is severe enough, there could be enough power
supply modulation, due to the PA current varying by the AM occuring in the
PA, that FM at the same modulation rate can occur in preceding exciter
stages (such as in the crystal oscillator, modulator, active temperature
I'm assuming that if the old RG-8 cables are being replaced
with RG-214 cables that are the same length, that the
velocity factors of both types of cable are the same.
Yep, 66%. Unless it's RG-8 foam, but I'm 99% sure that PD used regular
solid dielectric RG-8.
--- Jeff
It's called a Wilkinson splitter. Here is a link to some of
the theory.
I don't think it's fair to call it a Wilkinson without a resistor across the
output ports. A real Wilkinson provides port-to-port isolation due to the
addition of the resistor. A tee and 75 ohm cables doesn't provide
You can handle the impedance matching by using 1/4 wave
sections of 75 ohm
coax between the receiver input and the T. The 1/4 wave 75
ohm section
steps the 50 ohm receiver input impedance up to 100 at the
other end, two
of those in parallel at the T gets you back to 50 to match
the
I have been pulling my hair out (I don't have that much more
to go) over an
old Celwave 6 cavity 526-4 pass reject duplexer. I can get
the notches to
tune properly one by one but when I put it all back together
it just does
not seem to sum out right. Is there a procedure someone can
Speaking of UHF preamps, does anyone have any
experience/recommendations
for tower mounted preamps?
Al,
My experiences with tower-mounted preamps have been less than perfect. Good
designs will have dual amplifiers (redundant) and/or a bypass relay. Aside
from amplifier damage due
On a somewhat related note, has anyone used LNA Technology's (Chet Pierson
K3TV) preamps? He has some interesting designs. www.lnatechnology.com
--- Jeff
Yahoo! Groups Links
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Like others have said, Lunar doesn't exist any more. Angle Linear is the
current company, and Chip Angle makes great products. However, if your ARR
is working, you are likely not to experience any measurable improvement in
performance by switching to something else (assuming the ARR you have is
I have a set of either WP-639 or WP-641, I forget which is which. 4
cavities, pass/reject. They're in decent shape from what I remember; been
in storage for probably 10 years or more now. I can dig them out if you're
interested and give them a once-over.
I also have a 6-cavity Decibel
Does anyone know which pot in the gm300 adjusts the rx deviation?
Thanks.
Andy KC2GOW
The one labeled Volume.
Sorry, couldn't resist.
Seriously, I don't know what you mean. You mean Tx deviation? It's
adjusted in software.
Yahoo! Groups Links
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Title: Message
Will
the antenna be top-mounted or side-mounted?
-Original Message-From:
Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED]
On Behalf Of [EMAIL PROTECTED]Sent: Friday, December
09, 2005 7:17 AMTo:
Repeater-Builder@yahoogroups.comSubject:
an
accurate Vf figure to locate a fault by TDR. Anyone have an old
Phelps-Dodge catalog on hand?
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
Yahoo
-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Tony Faiola
Sent: Thursday, December 01, 2005 10:16 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Looking for data on old heliax
Jeff DePolo WN3A wrote:
Trying to help a friend
Sounds like a regular Bud diecast aluminum enclosure would fit the bill.
Try here: http://www.budind.com/view.php?part=n4
Hammond and others make comparable boxes. Available from Mouser, Digikey,
Newark, et al.
--- Jeff
-Original Message-
From:
.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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You guys are missing something... no one asked
him what size cavities he's using. If they are the
smaller TX/RX units... the reported lower power
output values are probably normal when using the
higher insertion loss settings with smaller
cavities.
cheers,
skipp
Maybe I
I keep hearing about this better data from commercial propagation
software but can't find any reference to it on any of their marketing
material nor references to how they actually do it -- even
assuming it's
proprietary, I don't even see hints about it anywhere.
A lot of the original 30
I believe the spec is defined in EIA-374 but I don't have a copy of that
document (EIA/TIA documents aren't distributed freely). Maybe somebody else
has a copy.
--- Jeff
-Original Message-
From: Repeater-Builder@yahoogroups.com
Yeah, when Mobilecomm (now Arch) decomissioned their 30 and 40 MHz paging
systems here on the east coast, lowband Decibel and Celwave pass cavities
were a dime a dozen (or often free). I scooped up as many as I could store,
probably 50 or so. All but a few are in service on 6m repeaters, most
(having email issues today, so if this is a dupe, please ignore)
RE: cell mixes and 440 repeater
I had a 440 repeater at a site with no other UHF transmitters for
probably a mile or two. On an adjacent tower was a cell site (this was
back in the early 90's AMPS days). When certain cell
Mmmm...are you sure they're Anderson? The ones I have say AMP on them.
Maybe they're interchangable, but I haven't tried it.
--- Jeff
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of
to
be sure.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED
104422-1)
Contact, A3007-ND(AMP 1-87309-3)
Housing, 5 pin, 455-1186-ND (AMP VHR-5N)
Connector terminal crimp, 455-1319-1-ND (AMP SVH-41T-P1.1)
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of
vintageaudio2004
Sent: Wednesday, August 03, 2005 10:52 AM
To: Repeater-Builder
or a
station?
--- Jeff
Jeff DePolo WN3A
- [EMAIL PROTECTED]Broadcast and Communications
Consultant
-Original Message-From:
Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED]
On Behalf Of [EMAIL PROTECTED]Sent: Monday, July 25
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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There's not a high-stab channel element per se, but Micor PURC (paging)
stations used an external high-stability or ultra-high-stability oscillator
for simulcast operations. These were external rack-mount units. A special
channel element plugs into the exciter that has two pigtails on it - one
generator, will cause you to spill over onto
adjacent channels even if the peak deviation is under 5 kHz.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
marriage and on-air testing has been more or less just a
proof-of-concept excercise up to this point. When I have more time I'll get
back to the project.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast
.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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Yahoo! Groups
The shady looking guy is Kevin and the even shadier looking guy is Scott.
Close-up picutres of both of them can be seen hanging in your local post
office.
Cold 807's for Repeater Builder subscribers at spaces 1758-1761 again this
year. See y'all there.
.
I will NOT ship any of this stuff, it's pickup only. Email direct.
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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Dave has them on his site for all bands -
http://www.ka9fur.net/geduplex/duplex.html
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message
I have a few of the dentless variety on 43.something MHz. How would you get
them to you from Philadelphia?
--- Jeff
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Monday, March 14, 2005 12:48 AM
To:
.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message-
From: Neil McKie [mailto:[EMAIL PROTECTED]
Sent: Monday, February 28, 2005 9:30 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re
frequencies (it would definately be a problem if it were your Rx frequency).
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message-
From
Didn't know about him, thanks for the info Bob. I dropped him an email.
-Original Message-
From: Bob Dengler [mailto:[EMAIL PROTECTED]
Sent: Monday, February 28, 2005 3:41 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re IFR 1500 CRT (was RE: [Repeater-Builder] OT- Cushman
I checked a few sources - BOR (Bust-Out Retail) real Belden Silver
Plated RG214 *is* about $5.50 a foot. Others, like Coleman, are
allot less.
Standard (nickle plate) RG214 was in Tessco's Outlet at $0.89 a
foot.
So if making jumpers, not going hundreds of feet, nickle plated
leave it at that.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message-
From: Bob [mailto:[EMAIL PROTECTED]
Sent: Thursday, November 04, 2004 3:35
a minimal increase in usable service area.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
Yahoo! Groups Links
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.. Might be
an easier solution than trying to fit one inside the box.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
-Original Message-
From: Chuk Gleason [mailto
Anyone have any pieces of 3/8 Superflex (FSJ2-50) to sell or trade? Could
use 100-200' total; several shorter lengths OK.
--
Jeff DePolo WN3A
Broadcast and Communications Consultant
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.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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in the cheap seats - THERE IS NO THEORETICAL LF
LIMIT FOR PHASE MODULATION!
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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isn't a fix, it's a band-aid that will eventually come off...
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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@yahoogroups.com
Subject: Re: [Repeater-Builder] Z-Matcher Component Values
Would that mean to tune for the highest power level out at the lowest
current draw?
Chuck
WB2EDV
- Original Message -
From: Jeff DePolo WN3A [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Tune for best PA efficiency, not maximum output.
--- Jeff
-
Jeff DePolo WN3A
Broadcast and Communications Consultant
-Original Message-
From: Tony King - W4ZT [mailto:[EMAIL PROTECTED]
Sent: Monday, January 26, 2004 9:42 AM
Title: Message
Decibel quit making the
ham-band DB420 (S-420-440-450) as of Jan 1 this year. From what I was
told, the harnesses for that antenna and other low-volume custom jobs were
hand-made in Mexico. Either that plant was closing, or the contract house
in Mexico that was making them
.
--- Jeff
-
Jeff DePolo WN3A
Broadcast and Communications Consultant
-Original Message-
From: Larry Williams [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 14, 2004 11:32 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Purc 5000 programming
Both Butternut and Hy-Gain made j-pole arrays for VHF and UHF. It's hard
to tell from the picture - does it appear to be ham-grade construction or
something more significant?
-Original Message-
From: Mike Perryman [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 12:44 PM
it is a capacitor. The dielectric is slid in
and out to vary the dielectric constant between the center and shield, i.e.
it is a dielectric-tuned variable capacitor.
--- Jeff
-
Jeff DePolo WN3A
Broadcast and Communications Consultant
-Original
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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Your use of Yahoo! Groups is subject
of
steep. I could use a few or a few dozen depending on the price.
Come to think of it, I could use a few for LDF4-75A too if anyone has any.
Thanks.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast
the idiosyncracies between the PURC and the standard Micor RT,
it's no big deal, but without the book, you'll spend a lot of time chasing
down traces on the backplane...
--- Jeff
-
Jeff DePolo WN3A
Broadcast and Communications Consultant
and minimizing inter-symbol interference for simulcast digital paging isn't
necessarily the most pleasant-sounding when sending voice pages...it may
have been a tradeoff.
--- Jeff
Jeff DePolo WN3A - [EMAIL
.
--- Jeff
-
Jeff DePolo WN3A
Broadcast and Communications Consultant
-Original Message-
From: Jim [mailto:[EMAIL PROTECTED]
Sent: Friday, December 05, 2003 9:41 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: UHF Links
I'm not knocking Spectrum - I'm just relating experience. I
have yet
to see one that stayed clean over the long haul. Any that
aren't clean
surely can't meet the type acceptance they once had.
Well said, very well said.
Humor:
I have a Spectrum repeater on the air.
Oh really? What
by 40 dB or so, but do nothing for the 3rd and higher harmonics,
which can really be a problem on highband (3rd harmonic ends up on UHF). A
real low-pass filter is what you should use.
---
Jeff
-
Jeff DePolo WN3A
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