Re: Searching for IMD
Post 59439 is partly incorrect. Just after I posted mentioning the visible clipping I realised, stupid me, was measuring gain during clipping which of course compresses the result.toggle quoted message. . .
I deleted that post. And have attached the new plots where you can see the gain difference between uBITX and Hayward version. This obviously partly accounts for the difference in input levels before output clipping occurs. The biasing arrangement gives different Iq also. Gain is reduced about 4dB in the Hayward version I built over uBITX. It now accords more closely also with his test results of 15.5dB I get 16dB at 30MHz.
Haywards paper gives some values for varying the gain to other values also.
On Sat, Sep 15, 2018 at 12:16 PM, Glenn wrote: