Hi,
70 watts out sounds OK. Duplexer's usually have about a 1 - 2db loss
depends how they are set up, size of cavities etc and the model type.
Duplexer loss = 10log(Pin/Pout) Duplexer Loss = 10Log(70/100)=
-1.54dB.
Peter
On Mon, Sep 6, 2010 at 10:54 AM, W3ML w...@arrl.net
FYI;
Many years ago when I worked for Hewlett Packard in their Test Equipment
division, we used to use a UK contact cleaner called Eletrolube, it was sold
by Radiospares in UK. It was the only spray or drip contact cleaner we could
use on the HP DC Standard as others would cause micro volt
Hi,
I remembered circular polarization was used for FM broadcast due to FM car
radios, but when I looked it up I found out some interesting facts, see the
link below,
Actually the correct spelling of the UK term for Antenna is Aerial
not Ariel. Ariel was the name of a now defunct UK Motorcycle maker which
closed around 1967.
Ex Brit.
On Mon, Aug 30, 2010 at 11:27 AM, Kevin Custer kug...@kuggie.com wrote:
On 8/29/2010 1:15 PM, Doug Hutchison wrote:
The spirit of air is mentioned in the Ariel Motocycle on Wiki as the
source of their name based on the fact they implemented very light (as air)
wire spoked wheels on cycles in the late 1890's. In this case I think it
seems to come from a character in Shakespeare's plays, notably The Tempest.
If you chose to go digital, like P25 then you could also measure BER in
your coverage test? This maybe more meaningful. Although many public safety
customers will still ask for voice checks as well.
On Sat, Aug 28, 2010 at 12:52 PM, Matthew Kaufman matt...@matthew.atwrote:
On 8/28/2010
Actually DC is the latest thing in power transmission. The gigantic Itaipu
Hydroelectric plant is located on the River border between Paraguay Brazil
and thus a shared project. Paraguay is 50HZ and Brazil is 60HZ. As such
half the Alternators are 50HZ and the other half are 60HZ. But most of
Translation from Brazilian Portuguese to English:
Hello to all,
Anyone have a circuit diagram of a simple Link - Repeater controller PC
Board. The controller would interface a VHF Repeater made up of two GM300
mobiles to a third interface port for a UHF Link using a Motorola Maxtrac
mobile
If you have a problem with a ground due to terrain issues, you might want to
look into using Lyncole grounding rods. These are hollow copper tubes with
a chemical crystal compound inside. The rod has some tapes around breather
holes which you remove prior to burying in betonite clay etc.. The
Hi,
This is a European MPT1327 trunked radio. Needs a specific GM600 version of
RSS to program it. I saw that the RSS seemed to be available on the web at
some HAM sites. Do a web search for Motorola GM600 RSS, OK?
Peter
On Sun, Aug 15, 2010 at 7:03 AM, dxhunters dxhunt...@yahoo.com wrote:
You might like to look at the latest Motorola R56 Installation standards
manual. It's very comprehensive. Has good section on grounding and
protective devices.
Yes, a good grounding system and a full lightning and surge protection of an
RF site doesn't come cheap. But if you live in Florida the
Hi,
Harold Kinley wrote an excellent article in MRT magazine a few years ago on
aligning circulators. Maybe they still have re-prints. I have old contact
details for Harold Kinley taken from MRT magazine. See below. You should
also buy his *Standard Radio Communications Manual, with
I agree totally with Gary. Common grounding point is essential to avoid
voltage differences between equipment during a strike. When you get a
strike the grounding point will rise, so you want to make sure everything
that is grounded goes up together. As the leading edges of the voltages
strikes
Hi Michael,
Probably for 220MHZ choose between VHF50HN-ME for high powered TX or
multiple TX'sand a IS-B50LN-C0-MA is for a single normal power TX.
These have the N connectors sexed as you want.Check the power rating of
each device at your frequency.
Peter
On Tue, Aug 17, 2010
I guess you say what type of modulation and bandwidth are you using for the
new Digital Repeater?
Should not be any problem. The digital modulation mask are getting more
efficient in the use of the spectrum as channel bandwidth get narrower. The
name of the game is to get more spectrum
Hi,
FYI:
I find that EBAY has the most HP Test Equipment for sale. I'll keep an eye
out for that model.
Peter
On Wed, Aug 11, 2010 at 7:59 AM, Chuck Kelsey wb2...@roadrunner.com wrote:
From another list:
Last Thursday , 8-5-2010 We had a Agilent model E4405B Spectrum
Analyzer boosted
Have you swept the Antenna and Transmission Line with a Site analyzer or a
Comms Analyzer / RF Bridge?
Peter
On Tue, Aug 10, 2010 at 8:35 AM, radi...@aol.com wrote:
I don't think there are any drain plugs on this antenna. connection seals
were checked and re-done. I am not familiar with
Hi,
Juts a thought:
Sometimes certain antennas have a drain plug at the bottom and sometime one
at the top. You should remove the drain plug at the bottom for normal
mounting or the one at the top for inverted mounting.If you don't water
can ingress, then can't escape and build up.
Thanks for the tip,
I'll try re-seating the flat cable connectors. Already cleaned the multi
turn noisy freq pot with success by drilling a small hole and injecting
suitable contact cleaner / lubricant inside.
Peter
On Sat, Aug 7, 2010 at 9:20 PM, Randy Fisher wb9...@indianadata.com wrote:
Hi,
I saw someone had used a HP3551A TIMS to set up repeater audio levels. I
have a used HP3551A also, but it recently stopped working. Wonder if anyone
had schematics? The manual I found online had everything but no schematics.
A good high resolution Jpeg photo of the schematics would be
Thanks for the HP Bulletin. Long time since I''ve seen one of those (Used to
work for HP in the 1970's to 1980's). I have already fixed the 5V Power
supply and that was a shorted 390uf 20V Electrolytic cap. But the digital
display does not display either level or frequency, although the audio
Thanks Ralph,
On Sat, Aug 7, 2010 at 8:26 PM, Ralph S. Turk w7...@comcast.net wrote:
I will try to remember tomorrow to look. If you don't hear from me in a
day,
send me a email
Ralph
- Original Message -
From: petedcur...@gmail.com
To: Repeater-Builder
Correction, Error, I meant the normal float charging voltage is usually
about 13.65V NOT 12.65 V.
On Sat, Aug 7, 2010 at 9:42 PM, petedcur...@gmail.com wrote:
Hi,
Sealed Lead Acid Gel batteries do not vent under normal conditions.
Referring to 12 V batteries: Just make sure the maximum
Hi,
Sealed Lead Acid Gel batteries do not vent under normal conditions.
Referring to 12 V batteries: Just make sure the maximum charging voltage is
as per the batteries spec. (usually about 12.65V at 25deg C) My experience
is that even when they have been left erroneously charging continuously in
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