After much gnashing, wailing and grinding of teeth, the main board of the MHST is sufficiently along to proceed with the remaining boards for the 40M MHST.
With about 3.6 milliwatts coming out of the mainboard steerable amp (1.2 Volts PTP) we need several boards to boost that output to > 300 Milliwatts to drive the IRF510. Below is a short video of how the output looks on 40M from the mainboard.
I have built several homebrew SDR transceivers over the last 5 years, but the challenges of this particular rig have really been a learning experience for me. Hopefully others will build along and gain that same experience.
Before getting too excited bear in mind this is a minimalist SDR and translating this design to higher bands will entail additional amplification stages. It is not a matter of simply changing out the BPF and LPF and you get several watts on 10M. The higher bands will need more intermediate stages of amplification.
Them that know can make it go.
Wish me luck today with my visit to the CA DMV to apply for my Real ID.
73's
Pete N6QW