Commercial T/R switches for echo sounder: 30-50kHz 540Vpp & 190-210kHz 90Vpp

Hi allI am in search of some suitable commercially available Transmit/Receive (T/R) switches for echo sounder development. Two types of T/R switches are required, one operating in relatively low frequency range (i.e. 30-50 KHz) withstanding high voltages (i.e. 540 Vpp) and one operating in relatively high frequency range (i.e. 190-210 KHz) withstanding low voltages (i.e. 90 Vpp).Kindly help me to find commercial T/R switches meeting the above requirements.Thanks

Try Microchip, TI, Maxim, etc, do an internet search, they are all low voltage parts. You may have to do a custom HV switch, base it on commercial designs, but use high voltage diodes, and perhaps a simple flyback converter to create the high voltage. I did something similar in the past with a switch working at 1500V over the 1-30MHz rangecheers,Richard

Hi Richard
Thanks for reply. The main issues in making own T/R switches using diodes is how to control the noise levels in this case? The signals received are of very low voltages in reception mode i.e. in micro volts.
Thanks

Diode switches have low series on resistance, and if you look at the noise levels, they are usually down below a nV/root Hz.The device I built was admittedly for an Ionosonde system, with a common antenna, so the switch blocked the 1000V transmit pulse, the receiver was working at the uV level.Cheers,Richard