Tagged: upconverter

Techminds Reviews the Ham-It-Up Nano Upconverter

A few days ago we posted about the release of the new NooElec Ham-It-Up Nano upconverter which sells for US$49.95 on their store and Amazon. Upconverters enable SDRs that cannot tune in the HF bands to receive HF by shifting the low HF frequencies "up" into a range receivable by most VHF/UHF capable SDRs.

In his latest video Techminds reviews the Nano together with an E4000 tuner based RTL-SDR with built in bias tee. In the video he demonstrates it working with the SDR# software, and shows how to set the Shift parameter to ensure that the correct frequency offset it set. He goes on to demonstrate reception through the various HF bands confirming that the unit works as expected.

Nooelec Ham It Up NANO - HF Upconverter

NooElec Releases the Ham-It-Up Nano HF Upconverter

Today NooElec have released a new product called the "Ham-it-up Nano" for US$49.95 on their store and Amazon. The original Ham-it-up is an HF upconverter that enables reception of the HF bands with SDRs that do not natively support HF. Upconverters work by shifting these low HF frequencies "up" into a range receivable by most VHF/UHF capable SDRs.

The new nano version is much smaller than the original design and about $15 cheaper if you compare against the version with metal case. The nano can also be powered directly via bias tee capable SDRs, so no external power source is required. Compared to the original version the nano misses out on the pass through switch and bonus noise source circuit.

The Ham-it-up Nano probably most directly competes with the SpyVerter from Airspy, which is another small form factor and bias tee powered upconverter for US$49.00. Spec-wise, the SpyVerter appears to remain superior with better LF/VLF support, less conversion loss and it's ability to use a 10 MHz external reference clock for advanced users. But the Ham-It-Up Nano is designed and made in the USA vs designed in France and made in China for the SpyVerter. The nano may also be a little cheaper and faster in terms of shipping to obtain via Amazon.

Below is a table comparing the advertised specifications with specs taken from the Ham-it-up Nano datasheet and SpyVerter sales page. Overall, most HF dabblers probably won't notice a major difference between the two unless you are truly setting up HF DX antennas. And as always our advice is if you are heavily interested in HF and DX, then it may be wiser to spend a little more and get yourself an Airspy HF+ Discovery (US$169) or an SDRplay RSP1A (US$109) or RSPdx (US$199.95) instead of an RTL-SDR + upconverter (US$20 + US$50 = $70).

Spec Ham-It-Up Nano SpyVerter
Frequency Range 100 kHz - 65 MHz 1 kHz - 60 MHz
Conversion Loss 10dB (typ) 5.2 dB (typ)
LO Frequency 125 MHz 120 MHz
IIP3 Not Specified 35 dBm
Max Input Power 1 dBm 10 dBm
Operating Voltage 4 V - 5.5 V 4.2 V - 5.5 V
Current Consumption 65 mA (typ) 10 mA (typ)
Power Methods Bias Tee, microUSB, Pin Header Bias Tee, microUSB
LO Stability 0.5 PPM 0.5 PPM
10 MHz External LO Capable? No Yes
Input Return Loss -10 dB (max) -10 dB (max)
Output Return Loss -10 dB (max) -10 dB (max)
Phase Noise @ 10kHz Not Specified -122 dBc/Hz
Dimensions 2.0" x 1.2" x 0.75" (50 x 30 x 18mm) 2.1" x 1.6" x 1" (53 x 40 x 25 mm)
Weight 45g 108g
Design & Manufacture Country Designed and Made USA & Canada Designed in France, Made in China
Price US$49.95 + shipping (free US shipping on Amazon) US$49.00 + shipping (~US$5 to US, or US$10 via US reseller)
The Ham-it-up Nano
The Ham-it-up Nano

Transmitting WSPR on QO-100 with a moRFeus and less than 4 mW Power

Thank you to Zoltan for submitting a short post about using a moRFeus to uplink WSPR to the Es'Hail-2 (QO-100) geostationary satellite with amateur radio repeater. moRFeus is a versatile US$99 signal generator and frequency mixer that can be controlled either by it's built in LCD screen, or via software on a Windows or Linux PC. It can generate a clean low phase noise tone anywhere between 85 to 5400 MHz, and can be used as a mixer for upconverting or downconverting signals. We have discussed moRFeus a few times before on this blog as we think it's a useful tool.

In his setup, Zoltan uses a QRP Labs U3S WSPR transmitter kit that was configured to transmit WSPR at 2m (144 MHz). It is not designed for transmitting the 2.4 GHz QO-100 uplink frequency. To get around that limitation, the moRFeus is used to upconvert the 144 MHz frequency into the QO-100 uplink band by mixing it with a 2,255,634.309 kHz signal. The resulting 2.4 GHz output signal from moRFeus is sent to an amplifier, 2.4 GHz band pass filter, and finally into a 5-turn LHCP helical feed mounted on a 1m parabolic dish.

Successful uplink was confirmed by a UK based WebSDR receiving the QO-100 downlink. Zoltan estimates that the total output power was only 4mW, and actually more like 1-2 mW due to losses in the coax feed.

WSPR uplink with moRFeus
WSPR uplink with moRFeus

SignalsEverywhere: Creating a DIY Upconverter with a HackRF and RF Mixer

Over on YouTube Corrosive from the SignalsEverywhere channel has uploaded a new video showing us how you can make a DIY upconverter using a HackRF as a signal source and a cheap $10 RF Mixer. An upconverter converts lower frequencies into higher frequencies. For example, an upconverter is commonly used to convert HF signals into VHF, so that VHF/UHF only SDRs can receive HF.

In the video he uses the HackRF as a local oscillator source, a cheap RF mixer on a breakout board, and an Airspy as the receiver. In most circumstances if you needed and upconverter you'd just purchase one like the Ham-it-up, or the Spyverter for ~$40. However the interesting advantage of using a versatile signal generator like the HackRF is that it results in an upconverter that can upconvert HF to almost any frequency. Even without any filtering (which is recommended to remove signal images), Corrosive fings that he has excellent HF reception.

This video is an excellent way to learn about how upconverters work.

HackRF and RF Mixer = DIY RTL SDR Up-converter | Basics of the Passive ADE Mixer

 

RadioForEveryone: RTL-SDR Max USB Cable Length, Dongles Image Gallery, Ham-it-up Plus Review

Recently Akos has uploaded three new posts on his RadioForEveryone blog. The first post is a review of the "Ham-It-Up Plus", which is a US$65 upconverter that allows you to listen to HF on RTL-SDR dongles without direct sampling. Compared to the non-plus Ham-It-Up, the plus version includes a TCXO and the noise source circuit is populated. In his post Akos reviews the history of the Ham It Up generations and discusses the connectors and power options. He also reviews the performance and finds that the Plus seems to have better SNR.

In the second post Akos has uploaded his collection of various images of different RTL-SDR dongle brands. The images include circuit board photos so you can easily compare the differences in design between brands.

Finally the third post is an experiment to determine the maximum USB cable length that can be used with RTL-SDRs. His results show that the maximum is 9 meters which is actually more than the USB2.0 spec which states 5m as the maximum. We note that longer than 9m cable runs can also be achieved by using active repeater USB cables or USB hubs.

Testing RTL-SDR max coax length
Testing RTL-SDR max coax length

Japanese RTL-SDR Products Now Available for International Shipping on Amazon.co.jp

Thanks to 'Nobu' for letting us know that his RTL-SDR products sold on Amazon.co.jp are now available for international shipping (in Japanese, please use the Google Translated version if needed). Before Amazon.co.jp offered international shipping you had to use a third party Japanese forwarding service in order to purchase his products.

Japan has a strong RTL-SDR scene, with a few small Japanese companies and individuals (including Nobu) selling custom RTL-SDR products on their local Amazon store. Products such as upconverters, galvanic isolators, LNAs, filters, cooling products and more are available. Back in 2015 we reviewed some of these products in a post available here. Since then we've found continued use in particular with the galvanic isolator which helps reduce noise from the computer and nearby electronics at HF frequencies. 

Some Japanese RTL-SDR Products available for International Shipping on Amazon.co.jp
Some Custom Japanese RTL-SDR/RF Products available for International Shipping on Amazon.co.jp

An Opensource Mini-Whip Antenna and Upconverter Design for RTL-SDRs

Thank you to Igor Yatsevich for submitting news about an open source Mini-Whip and Upconverter design that he's created and released for free on GitHub. An upconverter converts HF frequencies into VHF frequencies so that they can be received by RTL-SDRs in their quadrature mode, and a Mini-Whip is a small active antenna for receiving HF signals.

The designs include the PCB Gerber files for manufacturing, the components list and assembly and usage guides. Also both through-hole and SMD designs are provided.

The Mini-Whip design has a frequency range of 10 kHz - 30 MHz and to power it you'll need a 5 - 13V bias tee. You will need to install it up high and preferably away from the house as Mini-Whips are quite susceptible to local noise pickup. Another very important point is that Mini-Whips need to have a good ground connection. The upconverter is based on the ADE-1 mixer, and uses a 125 MHz local oscillator.

Igor's documentation on the project is excellent, and is a good read for getting more information about upconverters and Mini-Whips. He has noted that he is sending us some samples of units that he's built, so when we receive them we'll post again with test results. It looks as if he's put a lot of research into these designs so we're looking forward to seeing how well they work. 

Diagram on how to ground a miniwhip connected to a metal mast.
Diagram from Igor's documentation about how to properly ground a Mini-Whip connected to a metal mast.

Another GUI for Outernet’s Wideband Signal Generator moRFeus

Thanks to Ohan Smit for submitting news of his newly released GUI for Outernet's moRFeus wideband signal generator. Ohan's GUI works in both Linux and Windows. The Windows release can be downloaded from the GitHub Releases page. With the GUI you can change the mode between Mixer/Generator, generate noise, run a sweep, turn the bias tee on/off and generate a CW message.

A few days ago we also posted about about a moRFeus GUI by "Lama Bleu" which has similar functions. Although it only appears to run in Linux, Lama Bleu's GUI can interface directly with GQRX.

moRFeus is still currently on sale at CrowdSupply for $149 for the next 19 hours from the time of this post. The price is expected to rise after.

moRFeus GUI Generating a Sweep
moRFeus GUI Generating a Sweep