On Tue, 3 Sep 2019 at 09:36, -- <gpdxdveil@...> wrote:
I have 10W U/V transceiver.
Some of same transceiver users reports burnt after change 3rd party
antenna.
-'Don't use 50 Ohm matched aftermarket antenna. This transceiver not
matched 50 Ohm'
-'Burnt after even genuine Nagoya/Diamond antenna'
This sounds a combination of
1) Marketing rubbish to get you to use their antennas.
2) Poor engineering
The output impedance of this transmitter is likely to be considerably less
than 50 ohms. If the output impedance was 50 ohms and it connected to a 50
ohm antenna you would get maximum power transferred, but an efficiency of
only 50%.
The impedance of any antenna on a handheld transceiver will vary
*considerably* depending upon the position one holds it. So any handheld
device that is properly engineered will tolerate any degree of mismatch.
You would not be able to measure the output impedance of the transceiver
without a system called ¡°load pull¡± If you connect the NanoVNA to the
output of the transceiver, would very quickly destroy the NanoVNA.
Depending on how much the transceiver cost, I think you should either
1) Throw it in the bin
2) Seek a refund.
Dave
-
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales.
Company number 08914892.
Registered office:
Stokes Hall Lodge,
Burnham Rd,
Althorne,
Chelmsford,
Essex,
CM3 6DT,
United Kingdom
