![]() Output Z: Coax 50 Ohms nominal but may be a few Ohms to HI-Z.EXTRACT OF SALIENT SPECIFICATIONS AND INSTRUCTIONS FROM MANUAL: Note - Full manual available at The coax wires inside the transmatch could be replaced by RG8 mini. ![]() I plan to experiment with this later when appropriate. The long piece of buss wire attaching the rear of the capacitors might benefit from replacement with wide copper strap or heavier guage wire. Support the connecting wire to the switch with pliers to remove the stress from the ceramic switch. Be very careful you do not stress the switch while making this adjustment. ![]() This may allow better match on 10, 12, 15, AND 17 Meters. You may find that the small vertical coil in the front of the cabinet can be adjusted by spreading its top two turns. This makes it difficult to achieve minimum capacitance values to work at 10 Meters. The capacitors have to have a maximum capacitance sufficient to function at 160 Meters. At higher frequencies, the tuning is a bit touchy, but not to the point that you cannot use it in stock form.ÄĞuilding a transmatch that covers 160 through 10 Meters is a challenge. If these ever break, I plan to use a ceramic shaft coupler and add surplus vernier reductions to the stock knobs. The capacitor tuning shafts have plastic extensions. If you find one at a swap meet with this switch frozen in the lightning protect position, just disconnect the wire to the right hand capacitor. I always disconnect the antennas outside at a grounding rod when not in use during lightning season. ![]() Since I have external grounding type antenna switches, this feature is not used at my station. I removed the knob and used vise grips to carefully rock the switch shaft till it became operable. I applied some WD40 and let it soak in several times. The lightning protect switch was stuck in place when I bought it used after a long period in storage. This unit weighs 18 pounds due to the substantial cabinet. The only problem I encountered was the breakage of the lucite plastic insulators beneath the tuning capacitors. See the interior photos to understand the detaiiled notes below. QST often finds even 2 or 3 dB on recent transmatch product reviews. Have you ever seen a manufacturer dare to state the insertion loss in dB? Read the specs included later to see. I quickly became dissatisfied with the match range and reliability of the Ten Tec 238 transmatch reviewed elsewhere on this page. The authoritative clunk of the switch speaks of the quality and dependability of this well built unit. These all typically go for $90 to $300 depending on the power rating at swapmeets or better web sites. In the photos below, you can see the MT-2000A chassis is punched for the extra accessories included in the MT-3000. A big brother is the 3000 Watt model, which is the exact same components as the MT-2000A, except it includes a SWR/Power meter. A smaller 160-10AT looks like it will be OK for a 100 Watt CW or SSB signal I have another page for that tuner, with a mod which works better on 160 and 80 meters. The early Dentron Super Tuner is rated at 1 KW I have run it at 100 Watts AM (equivalent to 400 Watts or more PEP) with no problems. This transmatch comes in a variety of flavors. All the internal components are super heavy duty compared to commonly available new units. I recently upgraded to a legal limit ALS-1300, and it works fine with that, for coax fed antennas. It handles all the power from my Heathkit SB200, about 700 Watts output with no signs of arcing or heating. It matches any antenna I have ever connected to it. I have never found it lacking in performance. I am very picky about those items, and prefer to choose them separately. It does not attempt to add "features" like a power or SWR meter or antenna selector, which I prefer to add separately. It consistently gets a 5 rating on eham reviews. Of all the transmatches I own, this is my favorite.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |