Hunter - SDR Receiver / Panadapter


NOTE - Windows 8 users

Several builders have confirmed that the USB driver IS suitable for Windows 8.


  • Monitor a wide frequency span
  • Adds Panoramic adapter function to a commercial transceiver without internal modification
  • Tunes transceiver to selected frequency via CAT control
  • Powered from USB
  • Kit includes a high quality PCB, all components, case and solder.


Construction manual version V1.1 suitable for kits version V1.3

Drilling template

Front and rear panel labels

Hi res schematic

PCB Detail

Software links

Download and install

USB Driver
Download and install the USB driver, this should be self installing. You will have to copy ExtIO_Si570.dll to the HDSDR directory.

CFGSDR setup
Download and install CFGSDR. This is used to comunicate with SDR software.

The only use you need to make of this tool is to calibrate the Si570, all other settings are made within the AVR processor when programmed. Note that this will automatically install the USB driver.

Download and install, this is required to CAT control your transceievr from HDSDR.

Note when HDSDR and USB is running within HDSDR click on "EXTIO", on the calibrate tab click on Calibrate under "Calibrate A", this will calibrate the software to within a few Hz. Leave Calibrate B until you know everything is working correctly.


Tuition Videos

Surface mount soldering techniques, flux helps but is not esential.

Optimising sound card settings withWindows 7


Will be posted soon

Old data

No old data yet!


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Kit Contents

The kit contains PCB, case, all components and a generous quantity of surface mount (0.46mm) solder.

How to order

Payment can be accepted by PayPal, direct bank transfer, Western Union or by a Sterling cheque from a UK bank. For details on payment by Western Union or direct transfer please contact us for our banking details.

Probably the easiest way to pay is by PayPal, below are a series of "buttons" - select the appropriate one(s) and when finished click "View Cart", once payment has been made you should get an e-mail from PayPal confirming payment - we will send you an e-mail (to your Paypal e-mail address) normally within 12 hours advising on delivery etc.

UK orders can be made by cheque or postal order, HERE is an order form with up-to-date pricing for UK delivery.

Note that PayPal prices include postage, not included are any import taxes which may be charged by your customs (non EC countries); YOU are responsible for these. We can not enter "sample" or "gift" in the customs form so please don't ask.

Hunters are currently out of stock - please contact me by email if you wish to purchase one.