[arm-allstar] Simplex and Allstar

Sat Oct 19 00:08:07 EDT 2019

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 VHF  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
>>
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