Tag: equipment

New antenna analyzer available from DG5MK

If you thought about buying an FA-VA4 but were put off by its upper frequency limit of 100 MHz, you’ll be pleased to know that an FA-VA5 is now available for about $200. Michael Knitter’s (DG5MK) latest antenna analyzer kit has an upper limit of 600 MHz (the lower limit…

INRAD Microphones

INRAD Desk Microphone System is an exciting line of great sounding microphone models. Each INRAD microphone has an attractive stage-style body and a unidirectional cardioid element with unique audio characteristics to accommodate every operator’s voice, radio and preferences. INRAD micrpohones can be connected to most popular amateur radio transceivers, including ICOM, Yaesu, Kenwood, FlexRadio, Elecraft, Ten-Tec products.

“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 [su_button url=”https://forums.qrz.com/index.php?threads/buried-coax.617020/”]Read the Original Article[/su_button]

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…

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…

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. Read the Original Article https://forums.qrz.com/index.php?threads/74hct240-transmitter.614973/

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…

An Experimental Q Meter

Technical Reference/Test EquipmentThe article describes Q factor, methods of measuring Q factor, inductance and capacity using a Q meter and the design of an experimental Q meter unit.
The Q factor or quality factor of an inductance is commonly expressed as the ratio of its series reactance to its series resistance….

Ameritron 811x

Hi all hoping for some advice. I had both fuses blow on amp and when i took cover off found one tube blown glass was broken one had a filament gone so to be safe i replaced them all. put fuses in and it powered up ok so tuned antenna with my tuner, tuned amp,…

DIY QRO LiFePO4 Power for the Yaesu FT-891 857 Icom 7×00

Today’s topic, portable power for QRO field radios. For the ham radio operator in the field, portable battery power needs to be light enough, small enough, modular, have enough capacity, and above all it should be possible to replenish it off-grid, and in the field For the full article, http://www.southgatearc.org/news/2018/march/diy-qro-lifepo4-power.htm [su_button url=”http://www.southgatearc.org/news/2018/march/diy-qro-lifepo4-power.htm”]Original Full Article[/su_button]

How to make a mains filter for EMC and noise reduction

Technical Reference/Filters Article showing how I’ve made a mains filter to reduce EMC in the electricity supplying my shack. I’ve used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m. [su_button url=”https://www.dxzone.com/dx32977/how-to-make-a-mains-filter-for-emc-and-noise-reduction.html”]Full Original Article[/su_button]

Carry bag for KX3

Radio Equipment/HF Transceivers/Elecraft KX3 Manfrotto shoulder bag Amica 25W can be used ad low cost carry bag for Elecraft KX3. [su_button url=”https://www.dxzone.com/dx32990/carry-bag-for-kx3-.html”]Full Original Article[/su_button]

Yaesu FT-818 — The FT-817ND Replacement Available Soon

Today Yaesu announced a new FT-817ND replacement is on the way — the FT-818! The new Yaesu FT-818 incorporates all of the basic and attractive features of the ever-popular FT-817ND while providing upgrades desired by many existing owners. [su_button url=”https://forums.qrz.com/index.php?threads/yaesu-ft-818-the-ft-817nd-replacement-available-soon.600597/”]Full Original Article[/su_button]

Yagi Antenna for 23cm ATV reception

Antennas/VHF UHF A home made 23 elements yagi antenna for the 23cm band made on alluminium boom with floating element mounted on a plastic isolators. Includes a table with elements distances and lenght [su_button url=”https://www.dxzone.com/dx32988/yagi-antenna-for-23cm-atv-reception.html”]Full Original Article[/su_button]

Probemaster

Manufacturers/Test Equipment/Oscilloscope Probemaster manufacturers probes of all kinds, including oscilloscope probes, differential probes, test leads and much more, all proudly made in the USA [su_button url=”https://www.dxzone.com/dx31687/probemaster.html”]Full Original Article[/su_button]