Folks, I have a TT217 (9MHz 500Hz) CW filter that would like to trade for a TT285 filter, same bandwith but for 6.3 MHz. I recently got a Paragon, and while fixing it for a warbling problem, I am try
Folks, I have just got an 8-pole 6.3 MHz filter. It carries on the PCB the reference number 6840. On top, the reference cannot be read. Along with 8 crystals marked Green-red-black-blue-blue-black-re
Folks, it looks like "the" replacement for the 1N4007 is the Microsemi UM2110 PIN diode. Checking the archives back, it seems that those puppies are expensive and hard to find, and I have tried all t
Folks, has anyone interfaced an SDR to an OMNI-VI? My guess is that a point previous to the 15 kHz 9 MHz filter may be adequate, but I am not sure about the isolation requirements. Any hint?? Thanks
Folks, HNY to all. Some of the direct frequency entry keys on my Paragon fail. What can I do? Thanks for your help. jon, ea2sn _______________________________________________ TenTec mailing list TenT
Folks, and the TT208A, the filter and notch for the Argonaut 515, also uses two of those chips. jon, ea2sn _______________________________________________ TenTec mailing list TenTec@contesting.com ht
Folks, the CE mark has a bastard brother also called CE or China Export. They are similar, but not identical. On the Chinese one the letters are closer. You may see the differences by searching "Chin
Folks, when replacing incandescent lamps with LEDs, once you solve the problem of the voltage/current by placing them in parallel or series, and using a voltage dropping resistor when needed, there a
Folks, I have traced Tri-Flow to some Ebay sellers in the UK. But following the advice on this thread, I have visited a large Sports shop and have found a very similar 4 oz bottle of "Finish Line SEC
Folks, I have three boards with no clues of origin or schematics. Two of them have a reed relay, 8 transistors, 3x 7400, 1x 7410 and 1x 7476, coded 90461. The third one has 9 transistors and one UA74
Folks, after a hint I have been able to find a page where it describes two of the boards as the ones of a KR50 keyer. http://www.k9rei.com/2016/05/30/restoring-a-ten-tec-kr50-morse-code-keyer/ The PD
Folks, four years ago there was a discussion on the 208 filter on this list: http://lists.contesting.com/_tentec/2016-01/msg00036.html It seems it was very similar to the schematics published on QST
Folks, I am fixing an Omni D and, after solving a problem with the MC14528 on the timebase board, now one of the presets does not work as expected. I get consistent measurements of the VFO frequency
Mike, you are wright. It is the C model, as it has the WARC bands. The presets use diodes and three transistors. I have exchanged the counter chip but results are the same. jon, ea2sn _______________
Folks, First of all, my Omni is a C model. I always thought that D was after C, but it seems that the "D" was for digital, and C included the WARC bands. Following Mike's advice, I have studied the d
Folks, I have received a message from someone I suppose is on the list, with one of my messages attached and with the following text : "I have made some edits. Please check." and a link to a zip file