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Reviews Categories | Direction Finding equipment | Taiyo MF HF ADF TD-C338HS Help

Reviews Summary for Taiyo MF HF ADF TD-C338HS
Taiyo MF HF ADF TD-C338HS Reviews: 1 Average rating: 4.0/5 MSRP: $est $2500
Description: Synthesized, uses fixed crossed loop, goniometer type ADF. CRT
polar plot display. 200 Khz- 23.995 MHz. Other similar models
go to 30 MHz. TD-338HS was made for govt customers.
Product is not in production.
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SWL377 Rating: 4/5 Aug 13, 2015 14:48 Send this review to a friend
Good, but tricky on SSB  Time owned: more than 12 months
Used these on commercial fishing boats. GREAT ADF for CW and AM, but hard (not impossible) to get reliable bearings on SSB as azimuth scan rate (the effective rotational speed of the goniometer) was too slow compared to the syllabic speech rate. You couldn't tell a null from a speech pause. If there was a loud constant background noise, as from a genset or constant RPM propulsion engine, then you could see a consistent "propeller" pattern on the CRT and get a bearing on an HF SSB signal, especially when the guy transmitting paused in his speech and you only had the constant noise modulating the xmtr. The C338HS was made for govt customers and tops out at 23.995 MHz as I recall. A very similar commercial version goes to 30 MHz. The crossed loops are very hard to find as they are usually scrapped with the ship or left in place, Ship breakers in Bangladesh have them but shipping is prohibitive. Not too hard to home brew an antenna. These types of ADFs were used to locate net and longline buoys that transmitted just below 2 MHz. The advent of GPS enabled transponder buoys made the DF location method instantly obsolete. Few boats kept these ADFs and they now show up cheap as used gear, $50-$250. Finding the right Taiyo antenna is REALLY hard, so if you find one in any condition buy it as you likely won't get another chance. BTW shooting DF bearings on HF sky-waves is pretty useless for determining signal origin direction.

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