We had a wandering spur passing through the Game and Fish statewide frequency
at 151 MHz.
The maintenance engineer had to put the spec-a on the IF section of the
affected receiver [MastrII] to actually see it.
One he saw it, he demodded the signal and it was a local paging outfit on 454
MHz.
My agency's problem was a little different.
We operate on a conventional UHF repeater system.
At the time we had Micor mobiles.
Call would go out for a crash.
First unit in would be taking to dispatch fine.
Pulls his portable and is talking to dispatch through the PAC-R/T and the radio
in HIS
Interesting.
I just got one from the same seller.
eBay item number 230380368745
As I used to be a 'portables' tech and worked on a fair number of PE's, I hope
to get mine going too.
WalterH
--- In Repeater-Builder@yahoogroups.com, lsasmazel lsasma...@... wrote:
This unit come from Alaska
You hit the nail on the head.
This is an AIR CORE transformer with resonant windings on each side.
The video is pure infomercial.
What about the energy to run the 'primary' while the secondary is missing?
And the 50% efficiency is pretty low compared today's switching power supplies.
Smoke and
Unless someone had a standardized kit, and had the radio tested for
recertification by the FCC, then NO.
I know of NO pre 1997 radios that have been certificated for adherence to the
current emission mask for 'narrowband'.
WalterH
BTW, it's after 2012. Narrowbanding must be completed PRIOR to
Yahoo is notorious for not handling HTML mail very well.
Plus, if you are using Outlook, there is a specific issue with the way it codes
quoted material.
Best suggestion is to send only in plain text, and have it delivered in
Traditional' not 'Fully Featured' format.
WalterH
--- In
90.203 (j)3 specifies narrowband requirements ONLY for 150-174 and 421-512 MHz
bands.
90.210 (b)5, 'Bandwidth limitations'.
20 kHz is the standard 'Authorized bandwidth' for 25-50 MHz operations. No
optional 11.25 or 6.
WalterH
--- In Repeater-Builder@yahoogroups.com, wmhpowell w...@...
on strong signal performance, IM, 3rd order intercept,
etc., i.e. the preamp may be prone to overload by strong sigs. depending on
its design.
--John
--- On Fri, 8/21/09, ka1jfy walter.howard...@... wrote:
Long SNIP
Because CTCSS falses on the random noise.
Been there, done that, gave away the t-shirt.
WalterH
--- In Repeater-Builder@yahoogroups.com, n...@... wrote:
At 8/20/2009 23:17, you wrote:
John, how's this for an experiment...
Configure a repeater with two receivers, one built for +/- 5
Not quite the whole story Eric.
If the original poster is trying to use this in the ham 440 band, then the
preselector will most definitely need tuning before use.
Sinclair says their standard preselector is +/- 5 MHz.
And it should be mentioned that the gain of the amp is set to make up for
Something to keep in mind, is that the GP68 [and their chinese clones] are not
legal to use on anything other than ham in the US.
And, because it's also illegal to import them, they may be seized by Customs,
with no recourse.
WalterH
--- In Repeater-Builder@yahoogroups.com, Scott Yeager
Are sure it has been certificated for the current narrowband emission mask?
Ham, fine if it isn't.
Part 90, it ain't legal if it hasn't.
Take the FCC ID to:
https://fjallfoss.fcc.gov/oetcf/eas/reports/GenericSearch.cfm
and see if it's approved for 11K0F3E, Mask D.
WalterH
--- In
The analog bag phones were used for broadcast remotes all the time.
Listen to the horrible audio on call-in shows. A number of them won't accept
cell calls because of it.
WalterH KD7BJJ
PS: Phoenix [AZ] Fire did extensive testing of the 800 MHz P25 trunked
simulcast system vs. the VHF HiBand
Sounds like a job for a 4 wire audio bridge.
We use these
http://www.omnitronics.com.au/Interoperability.html
WalterH
--- In Repeater-Builder@yahoogroups.com, Joe k1ike_m...@... wrote:
skipp025 wrote:
SNIP
My question is how to tie the 3 transformers together at
the radio side of the
There was at least one version of a fiberglass 'ball bat' that had the ground
radials simply clamped to the bottom ring of the antenna with a variation of a
hose clamp.
WalterH
--- In Repeater-Builder@yahoogroups.com, gebhardstephen stevegebh...@...
wrote:
Thanks Gerald, that sounds like
Sorry you feel that way.
Didn't 'assume' anything, which is why I asked.
Maybe my tone was a little harsh, and for that I apologize.
I was just trying to stop someone from spending any time doing something that
just wasn't smart.
See way too much of that stuff happening in the Part 90 world.
Please, PLEASE, P L E A S E tell me you're NOT trying to use those wideband
only radios on a narrowband Part 90 system!
They will NOT meet the emission mask for narrowband operation without turning
the total deviation below 2 kHz.
And the receivers will still be wideband.
Bad choice.
Bite the
Chong;
Please tell the rest of the world what YOU'RE CB band is.
Tetra equipment usually covers a specific band of frequencies in the
380-430 MHz range, although WikiPedia says there are specifications
at 800, 900, and 450-470 MHz [http://en.wikipedia.org/wiki/TETRA]
WalterH
--- In
Horse Hockey.
To meet the new emission masks, the deviation on most older
transmitters would have to be below 2 kHz. And a hi-stab oscillator
installed.
And then it STILL wouldn't be type certificated for narrowband
operation.
As to the time required for a commercial shop to do the work,
Log in WHERE?
Can't figure out what group this is in.
WalterH KD7BJJ
--- In Repeater-Builder@yahoogroups.com, DCFluX dcf...@... wrote:
Thats a yahoo group problem, the files change links like every hour.
You'd have to login to see it.
Havent made too much progress as of lately but I do
Actually, they did.
By changing the PL tone that was sent from the 'med' radio, you
changed what frequency the mobile transmitted on.
WalterH
--- In Repeater-Builder@yahoogroups.com, n...@... wrote:
At 12/22/2008 10:21, you wrote:
SNIP
There was an Emergency episode where Gage DeSoto didn't
What make/model radio are you using?
Mobile/portable/base?
Do you hear ANY other users [besides the 'problem' user] on that
channel?
Where are you?
What frequency is involved [both RF and PL]?
Is your microphone 'hung-up'??
Contray to the name 'Private Line', all it does is prevent YOU from
Here in the states, the legal term for those is 'control stations'.
It's not 'semi-duplex', it's 'half-duplex'.
2 frequencies, receiver mutes during TX.
But you STILL haven't answered the main part of the question:
What features at what price point?
BTW, you might also want to ask this on the
What do you consider a reasonable price?
And what features are you specifically looking for them to have?
BTW, what is a 'trigger base'? A control station?
[I love when IT guys try to do radio]
Walter KD7BJJ
--- In Repeater-Builder@yahoogroups.com, Gareth Bennett \(Ihug\)
[EMAIL PROTECTED]
Not real interested in a PL filter, but my agency [hello Joe M] would
be REAL interested in a commercial version of the notch filter.
We currently put either a Vega passive [$150] or Midian active [$60]
2175 notch in every repeater we build up.
Walter KD7BJJ
Phoenix, AZ
--- In
One of our engineers had a factory tour of EMR.
They did NOT calculate critical cable lengths, rather they had a pile
of various length cables that they swapped in until it met specs.
They were NOT optimized.
That same engineer finally got a SWAG from them that the loops in the
EMR cavities
Could you guys please give the Digest readers a break and trim the
message you are replying to?
I have seen 4 and 5 levels of replies lately.
Makes it kinda hard to slog through the messages.
Thanks
Walter KD7BJJ
Maybe not ALL, but all /\/\ DTMF mics DO require mic bias.
Walter KD7BJJ
--- In Repeater-Builder@yahoogroups.com, skipp025 [EMAIL PROTECTED]
wrote:
All Motorola mics are 'pre-amped' mics.
Not accurate...
[paste text]
http://www.merriam-webster.com/dictionary/accurate
Main
New article on theory and practice of resonant cavities.
http://urgentcomm.com/test_and_measurement/mag/radio_practical_notes_ca
vity/index.html
Or if that link gets broken:
http://tinyurl.com/678y5j
Walter, KD7BJJ
Your choice.
One of the instructors used to work for my agency.
He tells tales of going all over the world doing on-site training.
Walter
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
Paul
Does Comtrain train you on the tower you want to be climbing or do
you
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