With tuning the cavities /duplexers should we use 50 ohm pads or something
else in line with the items when we tune them on service monitors
Thank You,
Ian Wells,
Kerinvale Comaudio,
361 Camboon Road.Biloela.4715
Phone 0749922574 or 0409159932
www.kerinvalecomaudio.com.au
---Original
Hi Tim,
Is usually a good idea to test the Duplexer while on a dummy load. I usually
like to use my Marconi 2955 Duplex mode to tune the duplexer. Once I am happy
with that then I go to the antenna see how that looks. I like to use the
lowest value element I can find for my bird meter to
Back in the late 60's or early 70's we tried this on one of the stations
I was involved with. CP can work with separate antennas but only if the
vertical and horizontal elements are in the same vertical axis and fed in
quadrature or 90 degrees out of phase. And the SWR needed to be
A friend of mine who is the foreman for a large
ranch asked me about providing radio coverage.
As there are a couple of hills (2000' AGL) around the
ranch, coverage in some places would be spotty, so a
repeater on one of the hills would be the best solution.
However, there is no power available,
go with Lo band, way good coverage, lo band maratracs are in abundant supply,
50.00 or less, no repeater to mess with .. lo band would work well. ymmv
mac/mc w5mc
- Original Message -
From: tahrens301
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, August 26, 2009
Hi Mac,
Thanks for the reply.
I thought about low band, but they want to use a number
of handhelds, I've never been much impressed about
the antenna selections on low band handhelds.
That has been a couple of years tho, perhaps things have
changed some.
Tim
--- In
yup.. walkie talkie does present a new hurdle .. gud luk
- Original Message -
From: tahrens301
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, August 26, 2009 9:56 AM
Subject: [Repeater-Builder] Re: Low Power VHF Repeater - Solar
Hi Mac,
Thanks for the reply.
Tim,
Is this a business band thing they are looking at, or can a GMRS repeater be
a solution?
Mark - N9WYS
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301
Sent: Wednesday, August 26, 2009 9:42 AM
To:
Mac - the guys often go out on the 4 legged mobile units,
trying to plug in for +12v is a bit tough! :-0
Thanks Stan, yeah, that's why I was looking for a commercial
unit that would be battery friendly. Will probably take some
additional mods, but that's ok.
Will continue to look.
Thanks,
Hi Mark,
I haven't looked into the licensing issues yet - I believe
that there is some kind of Agro/ranch license, but not sure. GMRS
might be an alternative.
Was starting with the hardware to give them some idea about how
it will hit their bottom line.
Tim
--- In
I'm looking for any information and/or construction details for a hi-gain
folded dipole omni-directional antenna in the 1.2 GHz Amateur band (similar to
the VHF design shown in the ARRL Handbook or the DB products line) for use as a
base or repeater antenna. I would like to build the folded
Any particular advantage of Maratracs over Motorola Maxtracs? (I've sort of
standardized on Maxtracs (for 10 6m) as so many are used in our repeater
system so there're lots of resources for 'em in our radio/repeater club.)
Are manuals programming software for Maratracs available? They look
Doug,
Check out the articles on the companion website:
http://www.repeater-builder.com/antenna/pdf/wr9aea-antenna-n9sn-hr09-79.pdf
http://www.repeater-builder.com/antenna/wa6svt.html
and the master page:
http://www.repeater-builder.com/antenna/ant-sys-index.html#antennas
A real treasure
I continue to be amazed by the vast so useful repeater-builder web site!
Just cruising it I find so many of my questions answered.
Thanks to all who participate in it.
--John WB0EQ
--- On Wed, 8/26/09, Mark n9...@ameritech.net wrote:
From: Mark n9...@ameritech.net
Subject: RE:
Mark - To keep from repeating my self i'll refer you to my response to John's
reply. I appreciate your reply but your references were for Yagi's and
colinear antennas and not applicable to what i had in mind of building, though
the colinear antenna may be a fallback. If Chuck Kelsey is
Dear sir ;
i trying everything to solve this issue but nothing happened the issue i think
the handheld (GP360) receive only squelch code without any audio voice i tried
to change the dip switch of hlnb nothing happened . is the hlnb
compatible with gm160 ? do you think the pin
No problem - I was merely offering options/suggestions. I understand your
desire to have a folded dipole!
Good luck!
73 de Mark - N9WYS
-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of n3dab
Mark - To keep from repeating my self i'll refer you to my response to
I just use a 50 ohm dummy load on the open ports when tuning a duplexer, or
leave one of the cables connected to the Xmtr. or Rcvr.
--- In Repeater-Builder@yahoogroups.com, John Transue jtran...@... wrote:
Bruce, Chuck,
Thanks for the quick reply. It appears that minicircuits has
Bruce, Chuck,
Thanks for the quick reply. It appears that minicircuits has
everything covered.
Bruce, I could not tell whether you are a dealer or just happen to
have some extra pads. My need is not specific yet, but I see that 6 dB
and 30 dB pads are used quite often.
My use of the pads
Sorry, I am of no help. I've never seen a folded dipole array for that band.
Not sure if anyone ever made one. My article was cloning a Signals brand
antenna with lengths changed to cover the ham band.
Chuck
WB2EDV
- Original Message -
From: n3dab rb_n3...@tds.net
To:
Unfortunately, transmitters and receivers are likely nowhere near 50 ohms.
Best to terminate properly.
Laryn K8TVZ
--- In Repeater-Builder@yahoogroups.com, n3dab rb_n3...@... wrote:
I just use a 50 ohm dummy load on the open ports when tuning a duplexer, or
leave one of the cables
OK. Thanks anyway. Just thought there might be some experimentors out there in
RF land. Do you think a 420-430 antenna work on the 3rd hanmonic, similar to
using a 2 mtr. antenna with a 440 transmitter, as I have seen mentioned here on
occaision There isn't a lot out there in
It might load OK, but who knows what kind of pattern you might end up with.
Chuck
WB2EDV
- Original Message -
From: n3dab rb_n3...@tds.net
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, August 26, 2009 7:08 PM
Subject: [Repeater-Builder] Re: 1.2 GHz Base antennas
OK. Thanks
Tim,
A low-power Motorola R1225 transceiver (1-10 watts) is ideal, since it is
full-duplex and contains the controller and IDer. Add a suitable duplexer,
a 90-watt solar panel, a 200 Ah AGM battery, and a good solar charge
controller, and you're good to go for less than $2,000. I put up just
Just wanted to say thanks for all replys
joel kj4si
Does anyone have either a manual or at least the Channel Designation
Table for the VT-3 and/or VR-3 low band MT-2 series radios?
Thanks,
Ed Yoho
W6YJ
Hey All,
I was having a discussion with a fellow tech and the topic of IMTS came up.
Does anyone here remember the reason for the strange channel designators?
JL YL JP YP YJ YK JS YS YR JK KR ? Why YL... why not channel B or Ch 2, they
must mean something...
Jesse
There seems to be confusion mystery in the crowd of radio
buffs that I han out with (not in this group!) on the subject
of connecting cable lengths for cavity duplexer use. I've
heard that the manufacturers of such devices also tend to be
mum on this.
It seems to me that if these
Jesse,
Actually, those are MTS channel designations; the IMTS came several years
after MTS was deployed. The eleven Y and J channels were in the 152-158
MHz VHF band, while there were also ten Z channels in the 35-43 MHz Low
band, and six Q channels in the 454-459 MHz UHF band. The low-band
Hello Tim,
We completed a Solar UHF GMRS repeater site this past May. Its been a huge
success. We used a Kenwood 40 watt TKR-850 repeater and 2 100 watt solar
panels. We started with 4 GMS batteries and they seem to support the system
with plenty of amp hours to spare.
You can go to our web
OK. Thanks anyway. Just thought there might be some
experimentors out there in RF land. Do you think a 420-430
antenna work on the 3rd hanmonic, similar to using a 2 mtr.
antenna with a 440 transmitter, as I have seen mentioned here
on occaision There isn't a lot out there in
Probably the same logic for designations used for tone frequencies, whatever
that was.
Chuck
WB2EDV
- Original Message -
From: Eric Lemmon wb6...@verizon.net
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, August 26, 2009 9:31 PM
Subject: RE: [Repeater-Builder] IMTS Channel
Folks,
A reasonable explanation can be found at URL:
http://www.privateline.com/TelephoneHistory3A/mobile.html on how the Bell
System used the two-letter Channel Designators as a prefix to the original
MTS 5-digit mobile phone numbers. Later, when IMTS replaced the MTS system,
Bell went to
Well, there, that explains it as good as can be. I recall the days when our
phone number started with PL3 (for 753 exchange) and the PL stood for
PLeasant.
Chuck
WB2EDV
- Original Message -
From: William Becks wbe...@centurytel.net
To: Repeater-Builder@yahoogroups.com
Sent:
I have a 900 mhz Spectra that will not power up .. i do have it hooked up
like i have others, so i believe it is wired correctly.. am i missing a
reset or master switch, or am i likey looking at ONE more doorstop here in
the shack of plenty already .. mac/mc w5mc
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