Доброго времени суток!
Тема не новая , но интересная.
Я слышал ,что народ улучшает характеристики TRX-ов
заменой PIN-диодов на более лучшие и нового поколения, но я не могу найти какие марки диодов народ использует и по каким критериям необходимо их выбирать?
Вот с этой инфо у меня и возник интерес :
To all those on Topband who asked...here is the results of the TS-940
tests.
73 Carl KM1H
--------- Begin forwarded message ----------
From: km1h@juno.com (km1h @ juno.com)
To: wsvhf@qth.net
Subject: [WSVHF] TS-940 Specs
To: <topband@contesting.com>
Date: Tue, 09 Sep 1997 22:35:15 EDT
Message-ID: <19970909.214104.9687.15.km1h@juno.com>
As an addition to the Sherwood receiver info, here are some specs on a
TS-940.
All tests were run on 28MHz during the past few days on a customers unit.
TS -940 late serial # with factory phase noise updates:
MDS SSB -135 dBm
MDS CW cascaded 500Hz filters -137 dBm
Sensitivity 10dB S+N/N .12uv
Phase Noise -131dBc at 10 KHz
Filter rejection CW >90 dB
2 tone dynamic range Wide 95 dB @ 20 KHz
2 tone dynamic range Narrow ( CW Filters) 77 dB @ 2 KHz
3rd Order IP +1dBm at 20 KHz
Wide Band transmitted noise -75 dB below full carrier
The same TS-940 but with PIN diode mods to RF and IF boards:
MDS SSB -137dBm
MDS CW -142 dBm
Sensitivity ~ .1uv
Phase noise -131 dBc @ 10 KHz
Filter rejection ( CW ) >90 dB
2 tone Dynamic Range Wide 102 dB @ 20 KHz
2 tone Dynamic range Narrow ( CW Filters) 83 dB @ 2 KHz
3rd Order IP +5 dBM @ 20 KHz
Wide band transmitted noise -90 dB below full carrier
Не плохие изменения в лучшую сторону ! Не правда ли ?!
73!
Игорь
:beer:
