[arm-allstar] Simplex and Allstar

Sat Oct 19 20:57:18 EDT 2019

Hi Kip,

For the Kenwood mobiles, the simplest way to determine the frequency split
is to look at the FCC ID info on the radios. For example, take a look at
the FCC ID's on these web pages:

https://www.kenwood.com/usa/com/lmr/tk-7180h_8180h/spec.html
https://www.kenwood.com/usa/com/lmr/tk-690_790_890/spec.html

You can program the Type-1 TK-790H for the 2M ham band without any special
requirements. There may be a small drop off in receiver performance.
You can peak the RX up, if required. The procedure is on page 70 of the 
service manual, here:

http://www.repeater-builder.com/kenwood/pdfs/tk-790-svc-man-2001.pdf

I've never had to make any other adjustments. However, theoretically 
speaking, it's possible you might have to adjust the PLL lock range, too 
(page 69).

The TK-7180(h) radios don't require any adjustment.

73, David KB4FXC

On Fri, 18 Oct 2019, Kipton Moravec wrote:

> You said:
> 
> More recently, I'm finding that I like the Kenwood TK-690H/790H/890H
> (VHF lo, hi and UHF) for high power. The TK-7160 (VHF Hi) is great, too.
> These Kenwood radios are just program, plug and play.
> 
> According to this:
> 
> https://www.kenwood.com/usa/com/lmr/tk-690_790_890/spec.html
> 
> 
> Model 	TK-690H 	TK-790H 	TK-790 	TK-890H 	TK-890
> GENERAL
> Frequency Range 	Type 1 	29.7-37.0 MHz 	148-174 MHz 	148-174 MHz 
> 450-480 MHz 	450-490 MHz
> Type 2 	35.0-43.0 MHz 	- 	136-156 MHz 	- 	480-512 MHz
> Type 3 	39.0-50.0 MHz 	- 	- 	- 	403-430 MHz
> 
> So the TK-790H is just above the Amateur Frequencies.
> 
> And if it is a TK-790 how do you know if it is a Type 1 or Type 2?
> 
> https://www.ebay.com/itm/KENWOOD-TK-790H-VHF-146-174-110-Watt-Mobile-Rear-Remote-Mount-HAM-Radio-KRK-5/113595002935?epid=1201869040&hash=item1a72ca3037:g:7ucAAOSwMkdcSgXs
> This one says 146-174 MHz. Can that be right?
> 
> https://www.ebay.com/itm/Kenwood-TK-790-Radio-DC-13-6V-12A-VHF-FM-Transceiver-Radio-See-Pics/153688508248?epid=1803902483&hash=item23c88c8758:g:S8cAAOSwBIVdqNa0
> This one looks like a Type 1, above the ham band.
> 
> https://www.ebay.com/itm/KENWOOD-TK-790-PCI-RACE-RADIO-45-WATTS-160chs-MOBILE-DASHMOUNT-COMPLETE/264497551406?hash=item3d9548582e:g:2GQAAOSwIhVdLe25
> 
> UP FOR SALE IS A GREAT CONDITION-COMPLETE BUNDLE
> KENWOOD TK-790 45W PCI RACE RADIO WITH
> ALL THE ACCESSORIES YOU NEED
> 160 channels Wide-band/Narrowband for Ham or Commercial use.
> 141-174mhz VHFÂ  45-Watts full power.
> 
> How can this have a different frequency range?
> 
> 
> This is confusing.
> 
> Kip
> 
> On 10/18/19 10:37 PM, "David McGough via ARM-allstar" wrote:
> > Hi Kip,
> >
> > Okay, I now better understand your usage plan and sure, that'll work.
> >
> > There are a great many surplus radio choices available, remembering that
> > since this radio will be linked to a repeater system and in use during a
> > net, it'll likely require very high TX duty cycle. So, how large is your
> > proposed simplex coverage area? ...Or, stated more directly, how much TX
> > power do you expect to need?
> >
> > I'll mention that I've previously used (really old now!) GE Rangr and
> > Motorola MaraTracs/Syntors for this type application. I'd set the TX power
> > at about 80W. With careful forced air cooling when transmitting, they'll
> > run 100% duty cycle all day long.
> >
> > More recently, I'm finding that I like the Kenwood TK-690H/790H/890H
> > (VHF lo, hi and UHF) for high power. The TK-7160 (VHF Hi) is great, too.
> > These Kenwood radios are just program, plug and play.
> >
> > ...And, there are MANY other radios, like the Motorola CDM1250 VHF.
> >
> > Hopefully other hams will comment of radios they've had easy success with.
> >
> > 73, David KB4FXC
> >
> >
> > On Fri, 18 Oct 2019, "David McGough via ARM-allstar" wrote:
> >
> >>
> >> Forwarding to the arm-allstar list.....
> >>
> >> -----------------------------------------------------------------------------
> >> Date: Fri, 18 Oct 2019 21:38:30 -0500
> >> From: Kipton Moravec <kip at kdream.com>
> >> To: David McGough <kb4fxc at inttek.net>
> >> Subject: Re: [arm-allstar] Simplex and Allstar
> >>
> >> Obviously I am not making myself clear.
> >>
> >> We have a Skywarn net with one VHF repeater and soon to be 2 UHF
> >> repeaters linked via Allstar only during the Skywarn net.
> >>
> >> The simplex frequency is for one user (NWS) who cannot reliability hit
> >> the repeater when the other repeater on the same frequency is active. We
> >> have other repeaters linked, but they are UHF and the NWS UHF antenna is
> >> 30 feet below the VHF antenna. We are 70 km from NWS and there are hills
> >> between. We do not believe UHF will make it but we will test it in
> >> December. This is in case that test fails. We will link the Simplex
> >> radio to the other repeaters only when there is a skywarn net. The rest
> >> of the time it will be off-line.
> >>
> >> The idea is during Skywarn we have a directed net. When someone is
> >> talking on the net it would be repeated through the simplex frequency
> >> for NWS to hear. When noone is talking on the net, the NWS could use
> >> that frequency to talk to net control and everyone could hear. (It would
> >> work like a RF link frequency between two repeaters.)
> >>
> >> I hope that is clearer for everybody.
> >>
> >>
> >> You said,
> >>
> >> There are lots of mobile radios (both ham and commercial) available with
> >> COS signaling already provided via an accessory connector. A good solution
> >> here is to obtain a commercial radio surplus--such as from ebay. There are
> >> many radios that work well and are inexpensive.
> >>
> >>
> >> Where is a list so when looking on ebay or elsewhere I will know if the
> >> radio has the COR signal available?
> >>
> >> Kip
> >>
> > _______________________________________________
> >
> > ARM-allstar mailing list
> > ARM-allstar at hamvoip.org
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> >
> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> >
> 