palomar

For Sale or Trade Palomar 300a 40m-20m-15m-10m 450 watt amplifier

Palomar 300a 40m-20m-15m-10m 450 watt amplifier. Great for use with QRP rig (817, flex 1500, other low drive radios) or a normal 100w rig. Has High and low settings. For QRP rig select Hi Pwr setting and 2 drivers are activated allowing the amplifier to be operated up to 450 watts with as little as […]

RLKmkop

For Sale 70cm Repeater, Amplifier, Controller etc

I'm selling some more stuff from the shack. Here I have several 70cm repeater items to create a complete system or just get what you need. Will sell all together or piece out. First come, first serve. All items work well and the only changes will be to tune to your own repeater pair. Shipping […]

sup2400gdots1-KD0CQ

SDR HACK Part II – The Mod – Receive up to 4.5GHz on your RTLSDR for $5.00

In Part 1 I showed that a cheap satellite upconverter can be used as a microwave downconverter with some mods. In this post I'll show you the modifications needed, step-by-step tutorial style, and make lame jokes. After more experimentation and burned fingers today I've found a more efficient way to do the mod that provides a much stronger signal at the output […]

sup2400-kd0cq

SDR HACK – Receive up to 4.5GHz on your RTLSDR for $5.00

Update: Click here for the mod tutorial – SDR HACK Part II – The Mod – Receive up to 4.5GHz on your RTLSDR for $5.00  Who needs to spend hundreds on a fancy HackRF, BladeRF, or USRP to listen in on the microwave bands? Not me, or you either, now! In this video I demonstrate using a […]

ICOM R7000 For Sale

SOLD – Icom IC R-7000 Receiver + IC-EX-310 Voice Synthesizer

This item has sold and shipped. (12-31-2015) For sale is an Icom IC R-7000 Receiver, IC-EX-310 Voice Synthesizer, HF Upconverter, and Pan Adapter. Coverage is  25MHz to 999MHz and 1025MHz-1999MHz. (plus DC to 25MHz with included upconverter!) This receiver also has the Icom IC-EX-310 Voice Synthesizer installed and working well. This radio is in very […]

Noisy Power Supply

RFI: CCTV Power Supply Causing 9dB Plus Noise

We recently added another set of surveillance cameras and DVR to expand the coverage around the property. After we set the system up we decided to expand it a little more and added 4 more cameras to it. At this point we needed a more powerful power supply that would connect to these 8 cameras […]

ad4351kd0cqSigGen

Wiring the Chinese ADF4351 35MHz – 4.4GHz Sig Gen and Cypress USB Dev Boards

A few months back I was looking at options to expand the range of the RTL-SDR upwards. I needed a somewhat stable and tunable UHF/SHF signal source to use as a LO to mix with. A redditor suggested using the ADF4351 development board as a ready to go signal generator. The ADF4351 (PDF), an Analog […]

bbbreset

Expand Partition and Create Swap File on BeagleBone Black Ubuntu SDR Img

IMPORTANT UPDATE: It was pointed out to me that SD cards have a limited number of writes cycles to them. I researched it some and that info is correct. So the swapfile is a bad idea. Don't follow that part of the tutorial, it could result in your SD card becoming unusable. For some reason […]

bbb

Packed Full BeagleBone Black img file RTL-SDR + GNURadio + GQRX + Lots More on Ubuntu 14.04

Update: June 2, 2015. I've removed the USRP version from the page. If I ever get a USRP to play/test with I will create a new image for it. If you are looking for the RTL-SDR version then read on! Howdy, This has been a bit of an undertaking fixing all the dependencies and compile […]

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