Our situation is that we have small local workgroups who need to converse locally, and occasionally chat with everybody in all groups. If I thought about it, I could probably figure out a "best way" to arrange this with simplex & separate T&R freqs, and different PLs. However, it might be too complicated for the average user to deal with.
73,
Don
At 09:00 PM 5/18/2005 -0700, you wrote:
Don,
You're absolutely correct. I was using the term "simplex" in the sense
of TX and RX on the same frequency. Although certainly not a universal
definition, the term "half duplex" is often used to describe TX and RX
on two different frequencies but not simultaneously. Some might
consider that practice to be wasteful of spectrum.
Perhaps a more efficient alternative is to configure the simplex
repeater radio to use different CTCSS tones for TX and RX. The user
radios must, of course, be capable of encoding and decoding different
tones, but that capability is not often found in Amateur grade radios.
73, Eric Lemmon WB6FLY
Don Pomplun wrote:
> I agree that hearing everything twice would get old quickly.
> What's wrong with this: The simplex repeater box listens on one freq,
> then retransmits on another. Everybody hears each transmission only
> once, albeit with a delay.
> Isn't the main advantage that of avoided cost?
>
>
> At 07:38 PM 5/18/2005 -0700, you wrote:
>
>> The Zetron 19B "Simplexor" was the only simplex repeater that seemed
>> to
>> work properly, since it was designed for public-safety application,
>> primarily for forwarding 2-tone sequential paging signals followed
>> by a
>> voice message. The 19B could be set to repeat the tones and message
>> a
>> certain number of times. Best of all, it was designed to plug into
>> most
>> Motorola and Kenwood commercial radios, and the voice quality was
>> excellent. I use the word "was" for a reason; the 19B Simplexor was
>>
>> discontinued a year or so ago.
>>
>> Not every radio user appreciates a simplex repeater, since all
>> listeners
>> hear every transmission twice. That gets old, really quick!
>>
>> 73, Eric Lemmon WB6FLY
>
>
>
>
>
>
>
>
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