toggle quoted messageShow quoted text
You could always use this so you could have built in swr/rf out on your bitx the 51ohm resistors I use 2x 100 ohm 3watt I picked this up from the internet
On 27 Jan 2018 09:32, "gw4akz via Groups.Io" <email@example.com
On Thu, Jan 25, 2018 at 01:20 pm, David wrote:
Instead of whistling into the mic when using an antenna tuner on SSB, we could easily add a tone generator and switch to do that for us. Thoughts?
I have fitted a switchable -6db pad between the output of the pcb and the anttena socket. With the circuit switched in the worst case swr is about 1.65 to 1 with an open or short circuit, this prevents the finals from ever seeing a poor swr. tune is easily achived with the key down and reduced radiated power when tunning up. I use 2 watt carbon resistors 33 ohms in a t attenuator circuit. 2 in parrarlel to give 16.5 ohms which is close enough to the callculated value. I use a relay to switch this attenuator in and out.