Tag: equipment

“Buried” Coax

I’ll be installing a Hygain AV-640 in the next 2 days and it will be in the backyard about 50 ft behind the
house. I was just going to dig a shallow trench and put it in there. However, I was wondering if it is OK to bury coax underground

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A 1-rig solution

400 watts at home; 20 watts portable I received my new transceiver in the mail today, only two days after ordering it. My hopes are that it will be a one-box replacement for the FT-891, KX2 and maybe even my Flex 6300. The radio is a SunSDR2Pro from Russia (via Seattle for US buyers) and, with various discounts, it was significantly less than the listed price. What few reviews there are  For the full article

Video: Flex 6300 vs. RSPduo

In this corner…weighing in at $265 – the (insert dramatic reverb) RSPduo from SDR Play (end reverb!). With all the ingredients on hand I couldn’t resist pitting David against Goliath. For the few weeks I’ve had the RSPduo, I’ve used it mostly to copy FT8 on various HF bands and 6 meters. I had more in mind for it when I bought it but its performance is such that it’s just too cool to let it For the full article

74HCT240 transmitter

I’m working on a new QRP transmitter based on the 74HCT240 octal buffer, the circuit has been described on many places, even in ARRLs books.

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Recondition the appearance of a radio?

My trusty FT857 has spent the past 9 years in my truck. After scraping off some Junior Mints, petrified boogers and cigar ashes, I can see that it might look pretty good again after some clean-up. (No big scratches or dings.) Does anyone know what is used by the folks that sell “refurbished” electronic devices to get them looking so good?

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Yup – It’s Another Si5351 VFO

To many, this will be just another Si5351 VFO project, with nothing to distinguish it from the others. In fact, that’s exactly what it is. The “how to” of connecting an Arduino board to an Si5351 board, wiring up a display, and loading the firmware, is straightforward, and well established. To me though, it was a complete mystery. I have been very adept, my whole life, at studiously avoiding anything to do with digital electronics, computing, coding, and the like….

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Icom 745 PA unit

I have this IC-745. Output power is 100 watts on 10 meters. Output goes down as you go from band to band. It is down to 1.1 watts on 160 meters. Problem seems to be on the PA unit. Scope shows about the same power to the TRF input to the PA unit. I have replaced Q1 driver. On 160 meters there is no amplification looking at Q1 with a scope. I have even dumped approx. 10dbm directly into the input of the PA unit with little to no output on 160 meters. Anyone have a clue.

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