Yes, this is known, and we will solve this, but it has nothing to do with OP-Amps. More with self resonance effects.storyofyouandme wrote: ↑06 Jan 2022, 07:39 speaker howling, especially when the volume is greater than 12.
73 Manuel; DL2MAN
Yes, this is known, and we will solve this, but it has nothing to do with OP-Amps. More with self resonance effects.storyofyouandme wrote: ↑06 Jan 2022, 07:39 speaker howling, especially when the volume is greater than 12.
Change of Adress means change of Software, so it´s no longer standardized. I´d suggest to substitute with:
I´m using a cheap left over chinese Mic from my VX-7R. The Connector was broken, so I removed the Yaesu 4-Pin connector and soldered a new 3-Pin Connector and re-wired internals.
Hi,storyofyouandme wrote: ↑17 Jan 2022, 13:15 ...I would like to ask what role the 2060 and 86256 on the RF board play...
Hi, Guido,pe1nnz wrote: ↑18 Jan 2022, 07:30 In contrast to traditional PA drain modulation, this rig is applying a 5V RF square wave to the PA gate, but at different DC bias levels to regulate the power (DC bias ranging from 0 to 2.5V just below the gate threshold). This means that the top and bottom of the RF square wave at all times still operating the MOSFET as a switch, like is required for a class-E configuration, but the power level (the amount of current through the FET) is changing with the varying bias levels.
The SWR Measurement consists of 2 equal transformers and doesn´t need to be calibrated. The current measurement hardware is "calibrated" by a defined trace lentgh on PCB. Whith 4 built units we did not see any significant differences.storyofyouandme wrote: ↑19 Jan 2022, 08:58 (...) Otherwise, these test hardware can only be seen, and the practicability is not high. thank you.
As said before: With the (tr)uSDX we´ve created a standard set of hardware. The whole point of this was to make sure, we can concentrate on features instead of "hardware Variations".
Users browsing this forum: No registered users and 0 guests