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rabbi
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Senior contributor



Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 152
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 64

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PostSubject: hf receiver preamps    hf receiver preamps  Icon_minitimeWed Mar 03, 2021 9:14 am

hi anyone done anything with hf receiver preamps kits ready built or maybe  units from china  i use a tv preamp on vhf/uhf receivers thanks for looking stay safe do radio paul m0kbd 73s
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Victor
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Victor


Call Sign : 26-CT-3228 / M7VIC
Posts : 5809
Times Thanked : 352
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: hf receiver preamps    hf receiver preamps  Icon_minitimeWed Mar 03, 2021 12:17 pm

Hi Paul,

I've never had any luck with wide-band pre-amps as they usually just add even more noise to the received signal!
I usually keep my radio's built in pre-amp switched off and even reduce the RF gain to improve the signal to noise ratio. (Seems counter intuitive but works surprisingly well.)

Most radios have a good front end to filter out-of-band noise but sometimes they can still creep in. In these instances a pre-selector or even a simple external ATU can help out a lot. Look out for pre-amps that have some sort of band selection or tuning method to them as that will be part of the pre-selector circuitry.

HTH.

73
Victor

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