!
---
Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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5 in for 100 out.
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
Yahoo! Groups Links
* To visit your group on the web, go to:
http
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
The notch generally will track the pass as it's adjusted, but it's not a
fixed-offset kind of thing. If you retune one of the cavities +1 MHz, the
notch may move +1.1 MHz, or +0.9 MHz, or ...you get the idea. So, no, you
can't just re-tune the pass and assume the notch has followed exactly.
Trying to find a datasheet for an RF power transistor - SD1499-1. These
were made by Thomson/ST Micro. Can't seem to find anything on-line, not
even a cross-reference. Any help would be appreciated. Thanks.
--- Jeff
Yahoo! Groups Links
* To
Kevin sed:
I've been attending Dayton since 1974. This year, I've had
two folks
contact me to see if I had gotten my tickets yet, as they have not
received any word. They need to be more prompt about
communications, or
they are going to
piss a bunch of folks off.
Scotty, did we get our
I have a Mastr II chassis that apparently a group of mice were living in
without permission and without paying rent (is there such a thing as a
mouse crack house?). Anyway, if anyone wants it, let me know before
before 10 PM EST tonight else it goes out for the morning trash. It's
just the
on it?
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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Don't have any of the Motorola power sensors, but I have a surplus of
Telewave and Decibel for various bands if anyone is interested. N male to N
female, with RCA jacks for forward and reflected. I know the Decibels have
adjusable pots for the forward/reflected output sample voltage, I forget
, but it's not cheap...
--- Jeff
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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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];
The commercial site where my 900 MHz repeater is, has
a bunch of PolyPhasers, so I bought one too. For that
band, it's only good for 50 watts, and I don't think
they had one rated for more power. So I had to replace
it with an Alpha Delta; I should have just bought that
the first time.
Now the new cable is in place, and that power that was getting turned
into heat is getting delivered to the cans. But, something smells
funny, and the interconnect cables between the cans are noticably
warm.
How much power are you running into the cavities?
I can't think of anything
No, not yet. Several vendors still have them, but I thought maybe I'd find
someone with a surplus stash that would make a deal.
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Dengler
Sent: Thursday, February 23, 2006 8:13 PM
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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I was told the following things:
440 Mhz is too high of a frequency to be in an elevator room
Well, they've got you there.
NFPA and the elevator code says that nothing can be
stored inside
of an elevator room other than equipment directly
relating to the operation
I also noticed that one of the high output amps seems to have an
issue when feeding the circulator. The output through the circ. (loss
thru the circ is about 1.2 db) starts at 60 watts and then jumps to
75 or so and the spectrum analyzer light up like a christmas tree.
Turn the power
Huh? Micor receivers are Micor receivers, whether they're sitting in a
mobile, station, or SpectraTAC chassis. Or in some cases, even in a
PURC/MSF5000 receiver chassis.
--- Jeff
-Original Message-
From:
The usual questions:
How much transmitter power?
What kind of transmitter and receiver?
What kind of antennas?
Are you using any other kind of external filtering, or trying to get by with
just split antennas?
What kind of feedline for each, and approximately how long?
Ok, I'll bite-what's AIP? I have a G707, and don't remember seeing
anything labeled like that.
Kenwood's AIP = Advanced Intercept Point. It reduces the sensitivity of
the receiver which has the effect of reducing receiver-induced intermod by
lowering the TOIP/compression point. Although I
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
Yes but that sounds sort of risky in that the lowest noise
figure of an LNA
is not necessarily achieved at optimum match.
Agreed, and most are tuned for lowest NF and not necessarily maximum gain
nor ideal match.
My previous comments relating to LNAs may also apply to the
JFET mixers
If we were talking about 6-meters, I'd agree on the 6-dB
disadvantage in
the mobile environment. I've never seen anything like that on UHF. I
don't buy into this argument yet ;-)
Chuck
WB2EDV
OK, if you don't like the mobile noise environment model, let's just look at
raw sensitivity
On Sat, 11 Feb 2006, Mike Morris wrote:
More details at http://wa6tdd.tripod.com and it's really worth
reading. And wait for the photos to load - they are worth
it as well
(just for the photo of WA6ITF 40 years ago). The Jampro
story is just
under his picture.
That was an
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
Yahoo! Groups Links
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-Builder@yahoogroups.com
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
Can someone please explain what the difference is between a
BandPass/BandReject duplexer and a BandPass/Notch duplexer?
In our little two-way radio world, the answer is that there is no
difference.
Technically speaking, a notch is very narrow, targeting only a specific
frequency. A
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
Does anyone have a good way of measuring the frequency of
PC board micro
strips (M/S)?
I'm not exactly sure what you're asking. Microstrips are basically just
sections of transmission line. A transmission line doesn't have a
frequency - it has a length and a characteristic impedance.
You
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
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Dengler
Sent: Monday, January 30, 2006 12:43 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] New system's in, but a few problems
At 1/29/2006 11:37 PM,
The coordinator in MI shouldn't object to a coordination from an adjacent
council just because their bandplans aren't identical. For better or worse,
there isn't a universal bandplan that satisfies the entire amateur community
nation-wide.
If there is nothing coordinated in MI that is going to
.
Tom
W9SRV
Jeff DePolo [EMAIL PROTECTED] wrote:
The coordinator in MI shouldn't object to a
coordination from an adjacent
council just because their bandplans aren't identical.
For better or worse,
there isn't a universal bandplan that satisfies the
entire
The length of the jumper cables between the cans has a profound
effect upon the insertion loss at the pass frequency, and relatively
little effect upon the isolation at the notch frequency.
73, Eric Lemmon WB6FLY
Eric,
I'm curious why you say this, as it contradicts what I would
Once a new low-split harness was
purchased directly from Sinclair (about $125, as I recall) and
installed, the duplexer tuned up with the expected pass loss of
about 1.6 dB. The notch attenuation was within a dB of the previous
value, using the incorrect harness.
Well, my guess is that
1984 plymoth voyager with 3 stationmasters, 2 UHF eight bay dipoles, 1
UHF 16 bay and a VHF 4 bay.. that was a good ride!
How did you mount them? Mag mounts?
Which antenna held up best at highway speeds, the Stationmasters or dipole
arrays?
Did you get poor gas milage?
What did you
I have a surplus of 100 watt UHF Mastr II repeaters (88 split) that I'm
looking to trade. I'm looking for high-power (150+ watt) solid-state UHF
amplfiers that will tune in the 440 ham band including TE Systems,
Crescend/Milcom, Vocom, Glenayre, etc.. I'll trade straight across, one
station for
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
Most Sub station transformers like the one in the video
which form the looks of the bushing size is at least 69kv
or possible 138kv normally have fuseing on the High voltage
size and then go to buss work and feed distribution breakers
for the journy out to the line system so for my 2
Another quick n' dirty way to lay out racks is to use Excel. Re-size
the width of a column to make it approximately the same height-to-width
ratio such that one cell is about the size of 1 RU. Select the number
of cells to equal the number of rack spaces you have available, put a
fat border
The 522-509 is an odd creature. There are two pass and two notch on the
transmitter side, and one pass and one notch on the receiver side.
Discussions about this duplexer came up a while back on this list -
maybe it's in the archives? I think Bob NO6B posted measured
performance of one he put on
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
If the building has a steel infrastructure, your lowest-R and lowest-L path
will likely be to tie to the building steel. However, there are code
implications for doing so (as well as any other tower grounding) so be sure
to check local codes and/or NEC. If building steel isn't an option you may
, 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
* To visit your group on the web,
Hmmm Seems I am batting 1000 on crystals for my Micor
Transmitter from JAN. First crystal was low in Freq. and Now
the Second is as well. I am not sure if there could be a
reason other then they are cut wrong as I have done the
following to check different things
The first time I used
I think I will just go with a basic Kreckman, Diamond or
Comet (in that order) and some RG-214.
I'd still go with 1/2 just for the sake of longevity. Surely someone local
could give you an end-of-reel piece that long?
It is looking like the Site will require less than 20 feet of
Coax
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:
it will be side mounted
- Original Message -
From: Jeff DePolo WN3A mailto:[EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, December 09, 2005 7:47 AM
Subject: RE: [Repeater-Builder] Need Advise: 6m Repeater Antenna
Hey Jeff- Just last year I had a similar problem. The first
thing we did was look through the old engineering data for
the site. In most cases, the sample lines should all be the
same length, so if you shoot the lines to the other tower(s)
with the TDR you can compute your own VF for
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
Yahoo! Groups Links
* To visit your group on the web, go to:
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* To unsubscribe from this group, send
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
Just about any decent broadcast-oriented remote control system will do what
you want. For examples:
www.sinesystems.com - model RFC1/B (bare bones system)
www.burk.com - ARC-16, GSC3000, VRC2500
www.broadcasttools.com - several different units; look at their upcoming
VMC-8 product
The ProTek
.
--- 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
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