4 separate transmitters through one antenna at the same time

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3 total messages Started by neil Thu, 09 May 2002 06:45

#39

Author: neil
Date: Thu, 09 May 2002 06:45

20 lines
1218 bytes

Could I find this kind product of

4 separate transmitters in one housing and

all transmitting at the same time through one antenna ?


--

Best Regards,

Neil Cheng

            fun172@ms8.hinet.net


ICQ#:152058105

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=================

Re: 4 separate transmitters through one antenna at the same time

#40

Author: Reg Edwards
Date: Thu, 09 May 2002 09:54

16 lines
1658 bytes

> Could I find this kind product of
> 4 separate transmitters in one housing and
> all transmitting at the same time through one antenna ?
>
==============================

Obtain 4 transmitters.
Follow each transmitter with a 20dB attenuator.
Connect all 4 attenuators to one antenna.

Instead of attenuators follow each transmitter with a bandpass filter.
Suggested transmit frequencies -  0.5 MHz, 2 MHz, 10 MHz, 50 MHz.

Or use multi-channel FDM or TDM equipment.
---
Reg.

Re: 4 separate transmitters through one antenna at the same time

#41

Author: Uncle Peter
Date: Sun, 12 May 2002 01:17

30 lines
1796 bytes

For VHF/UHF the product is called a transmitter combiner.
Uses bandpass cavities and usually dual stage ferrite isolators
on each transmitter for IMD isolation.

Peter

"neil" <neil@cop-security.com> wrote in message
news:abd5sl$pss$1@news.is.net.tw...
> Could I find this kind product of
>
> 4 separate transmitters in one housing and
>
> all transmitting at the same time through one antenna ?
>
>
> --
>
> Best Regards,
>
> Neil Cheng
>
>             fun172@ms8.hinet.net
>
>
> ICQ#:152058105
>
> --------------------------
> =================
>
>

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