Doppler DF Instruments : Equipment Purchases
NOTES : Transmitter purchases require valid amateur radio license… provide your call sign.
Standard MicroHunt transmitters are encoded with CW message "MOE", which is repeated over and over at 8 WPM until station ident is sent at 15 WPM. Standard TX duration is 30 seconds, standard repeat time ( = time from start of one TX to start of next TX ) is 90 seconds.
For custom CW messages, additional information is required from the user, to allow encoding of the CW message, into the micro. If you desire a custom message, custom TX time or custom TX repeat interval, please specify these parameters when ordering. Two CW speeds are available, approx 8 WPM and 15 WPM. Please consider CW speed and message length when specifying the message... don't try to send 100 characters in 10 seconds at 15 WPM.
International-style hunts employ multiple transmitters on the same channel, carefully "timed" to prevent overlapping transmissions. The repeat time for each transmitter therefore is determined by the number of transmitters used at the same time. If the TX duration is 30 seconds and 2 TX are used, repeat time must be 60 seconds, 3 TX = 90 seconds, 4 TX = 2 minutes, etc.
Caveats and Disclaimers :
1. This equipment is only sold as assembled / tested PC boards, not as finished instruments. Additional assembly work by the buyer is required. Some technical skills are therefore required, including : ( 1 ) Ability to read and follow a schematic diagram, ( 2 ) Reasonably good soldering skills, ( 3 ) Mechanical assembly skills, and ( 4 ) Moderate metalworking skills, specifically for the PicoDopp antenna platform.
2. The buyer must also provide additional materials, hand tools and equipment to complete the assembly. Details about these requirements are provided in the web pages for the specific items, or questions may be directed by e-mail to Bob Simmons.
3. This DF equipment is intended for outdoor use, in portable or mobile installations. The DF equipment is furthermore intended for use in clear areas or terrain, or at locations with a clear view of the horizon in all directions, as viewed from the antenna. Reliable operation in other circumstances simply cannot be guaranteed. Specific locations can generally be found where these instruments will yield inconclusive or even contradictory readings, and ( in such locations ) these instruments will be rendered useless.
4. This DF equipment ( like all portable / mobile DF equipment ) often requires some user skill and interpretation for effective use. Experience is helpful and "staged" hunts can provide considerable help in learning DF "behavior" before the DF is actually employed in a genuine hunt.
Terms of Business :
To Order :
Send an e-mail to Bob Simmons. Please include the following items of information :
Be aware, some shipping methods require a signature for delivery, so a post office box or a "mail drop" is not acceptable. Some shipping methods do not have insurance, and some do not have the ability to trace or track the delivery progress of the parcel... If these features are desired, please investigate them when identifying the preferred method of shipment, and specify your desire for these features, in the order.
Orders placed without an e-mail communications will be delayed, or may even be declined.
Transmitter purchases require a valid amateur radio license… provide your call sign, it will be checked against public records.