Mon DU1FV

 notes from auction site ic-706 Product Description It is in working condition. The transmission output on each amateur band was measured using our uncalibrated power meter. 1.9MHz band: 85W, 3.5MHz band: 100W, 7MHz band: 95W, 10MHz band: 90W 14MHz band: 94W, 18MHz band: 94W, 21MHz band: 88W, 24MHz band: 85W 28MHz band: 85W, 50MHz band: 58W, 144MHz band: 11W It was. [Photo 9] The cooling fan operation was also confirmed. (Normal: Low speed, When transmitting at a speed other than 144MHz: High speed) There are no strange noises. There was no noticeable difference in reception compared to other amateur radios. However, due to the inherent performance of this model, the reception sensitivity in the 144MHz band is poorer than other models. We carry out the following repairs: This is a problem specific to this model, but it is caused by insufficient support on the female side of the power connector. PA unit L21, L31, and Q5 were pushed off by the housing and fell off. L21 and L31 were t...

 My First Software Defined Radio at less than P5k I bought this on a whim, and when I got it, I kicked myself for not ordering it sooner! Some tech details from the Readme:   For SSB reception, the a digital SDR phasing stage is used; this means that a Tayloe Quadrature Samplimg detector supplies individual I and Q outputs, directly fed into the ATMEGA328P ADC inputs for signal processing. The ATMEGA328P (over-)samples the ADC input at a 62kHz sample-rate, an decimates this high-samplerate to a lower samplerate, performs a phase-shift by means of a Hilbert-transform, summing the result to obtain side-band rejection; it subsequently applies a low-pass filtering, AGC and noise-reduction functions. The ADC inputs are low-pass filtered (-40dB/decade roll-off at 1.5kHz cut-off) to prevent aliasing and input are biased with a 1.1V analog reference voltage to obtain additional sensitivity and dynamic range. With the 10-bit ADCs and a 4x over-sampling rate, a theoretical dynamic range...