(Updated May 2013)
|Transmitter Hunting Links
For general/personal enquiries email firstname.lastname@example.org. Otherwise use the links below.
1. VHF Sniffer MK4 A ready-to-go processor controlled synthesized auto-ranging foxhunt sniffer covering both 120 and 144MHz bands.
previous VHF MK4 (v2.4) has been discontinued and replaced with a new version. High exchange rates to
the USA and obsolete parts made the original product too difficult and expensive to produce.
The new version (V3.1) is functionally identical. Please use this link to request pricing etc. Dont forget to include a delivery address so postage can be accurately calculated.MK4 Manuals:
pdf Manual for V3.1 - (Current edition for v3.1 hardware and v3.1.xx firmware)
pdf Manual for V3.0 - (For v3.0 hardware and v3.0.xx firmware)
pdf Manual for V2.4 - (For v2.1.25 to 2.1.28 firmware only. Limited release)
pdf Manual for V2.3 - For latest MK4 sniffer (v2.1.20 to V2.1.24 firmware)
pdf Manual for V2.2 - For v2.3 and v2.4 hardware (up to firmware release 2.1.19)
Manuel d'utilisation V2.2 - French version for the MK4 sniffer)
Kindly translated by a French amateur who wishes to remain anonymouspdf Manual for V2.1 - for v2.0 and v2.1 hardware.
pdf Manual for V1.3 - for first issue MK4 sniffer.
Bigboar trackers Basic manual V2.3 - Special dog tracker version. (Firmware 2.1.20 or later)
Hunting short duration signals with the MK4 - techniques for hunting short duration pulsed transmitters for animal collars and wildlife.
A UHF version of the MK4 has been made in small quantities on 430MHz (Aus 70cm), 440MHz (US 70cm), 462MHz (FRS) and 477MHz (UHF CB). Operation and sensitivity is similar to the VHF MK4. It is made in very small quantities so it is more expensive to produce. It can be built to cover any 10MHz segment from 400 to 520MHz. Due to some obsolete parts there are now very few of these left!!!
2. The Microsniffer is a board level only product for those foxhunting on a budget who don't mind putting in a bit of extra effort. This project has been revised but so far there has been very little interest in it. So the project is currently shelved until I can get enough time to work on it and there is enough interest to complete it. Making it available as a full kit is difficult because of the small size of some of the components and the need for special test equipment. The plan is to produce for use on 2m (144MHz-148MHz) only! Check this link for a feature comparison with the MK4. Please email the author to register interest and I might try to give it some priority...
3. Antennas: The supply of lightweight companion antennas has dried up
for the time being. If you want to consider building your own, contact Jack Bramham,
VK3WWW for details. There are also a number of good Tape Measure based designs that have been used with this
sniffer with great success.
Arrow Antennas have a number of ready built antennas on a variety of bands suitable for foxhunting.
Bob Miller provides Antennas and DF solutions for both 121.5MHz and 2 meters and usually holds small stocks of the MK4 sniffer for online purchase in the USA.
I am also looking for contacts to pass on for other ready built or kit foxhunting antennas or antenna projects. If you have something along this line that I can add here please email me .
4. 80m Foxhunt Receiver - This
project was featured in the September 2003 issue of Amateur Radio
magazine. Kits are now sold out but some specialised parts are still
5. Other Foxhunting projects - Includes foxhunting transmitters and details of the old MK3 auto ranging 2m sniffer.
1. The Victorian ARDF Web Site (AUS).
This site has the details on Australian and international ARDF competition events.
2. Using the MK4 to hunt an ELT.
3. Joe Moell's foxhunting web site (USA). Contains heaps of useful stuff on foxhunting. This is arguably the best transmitter hunting information site on the net. A must visit!
4. Ken Harker's Texas ARDF page has some good notes on ARDF transmitter hunting.
5. Piedmont Transmitter Tracking web site (USA).
6. VK3VT Fox Hunt beam article. Probably the most used foxhunt antenna design in Melbourne!
7. Hunting interference sources with the MK4.
UHF CB (477MHz) MK4 sniffer and antenna:
A number of these have been built for use by cubs and younger scouts.
Articles presented at Gippstech:A high performance 2m downconverter for fox hunting
This article outlines a high intercept point synthesised and self contained 2m downconverter with a 21.4MHz IF. Presented at Gippstech 2008. AA battery selection and storage for portable operation
Have you ever wondered if buying some of those "cheap" supermarket batteries is worth it? This article presents the results of nearly 12 months of testing the discharge rates and storage methods for alkaline AA batteries. Article as presented at Gippstech 2006. Solving noise problems in modern radio systems
Are you doing a project combining digital and sensitive RF circuits? This article presents some considerations based on knowlege gained by the author while doing design work with such systems. This article was presented at Gippstech 2002 Making printed circuit boards at home
Making high quality printed circuits at home is easy using the Kinsten PCB material! This article outlines how to do it. Presented at Gippstech 2001 Simulation tools, real components and limitations
Using free RF simulation tools to get repeatable results for amateur radio projects. Presented at Gippstech 2001
Other reference articles:Measurements on some RF components
For my own reference!