When my 961 bridge rectifier failed I replaced it with a KBPC3510 - a drop in replacement rated at 1000v 35A. New cost here in UK is £2.40. No other components had failed on mine, but it would be wis
Ever since I got my OmniVI I've been annoyed by a low level heterodyne whose pitch is independent of the main tuning but which changes rapidly with the PBT setting. There was some discussion of it on
John, I went by the TenTec manual here, which shows them as MRF428s: http://www.qsl.net/tentec/manuals/444.pdf If they are MRF428s, there seem to be some in stock here: http://www.digikey.com/product
I recently bought a spare Model 260 PSU. Checking it out, on the regulator board I found a missing diode, and an extra diode, resistor and PNP transistor tacked at the rear of the PCB. At first I tho
Of course it doesn't have to be one or the other - I've arranged things so I can quickly switch between the two configurations. The top-loaded vertical configuration wins every time for DX and local
Some care has to be taken when interpreting the LP-100A's power readings. On my version it indicates Pfwd when the "F+R" mode is selected, and Pfwd-Pref when the "Net" mode is selected. I got caught
Things are seldom as simple as they at first appear! The Model 1225 - like all the SWR meters I've ever built or owned - does _not_ simply indicate power by measuring line voltage (V) and computing V
If you mean the display driver IC, there are plenty listed on eBay. That's where I got my last ones. Here's just one example: http://www.ebay.com/itm/1PCS-LED-DISPLAY-DRIVER-IC-MOTOROLA-DIP-18-MC1449
Let's keep this in proportion, folks! From Jim's description of the symptoms, it seems likely there's a fault - which TT didn't spot - which stops the BFO being shifted on CW Tx; if that's the case i
Jim, Try this simple experiment if you have a receiver that will cover 9MHz: 1) Take the top cover off the Omni (4 screws) 2) Place a piece of hook-up wire into the receiver's antenna socket and drap
Jim's getting RF out OK - it's just on the wrong frequency! All the symptons - including the fact that he can "artificially" compensate using XIT - points to the BFO not being pulled to the correct f
Jim, The VI+ results look close to what you would expect, but the VI shift is far too small and confirms this is where the fault lies. The only thing that surprised me is that you couldn't hear the V
Jim, By "listening in" directly to the BFO signals at 9MHz you are independent of all the sidetone and XIT offset processing that goes on in the microprocessor. The BFO oscillator is completely free-
The attached document may help understand the OmniVI mixing scheme a bit better: http://www.karinya.net/g3txq/temp/omni_mix.pdf Note that - ignoring the RTTY mode - the BFO is only ever on one of thr
In my manual it reads: The trimmers can be set with a high resolution counter at connector 46 by switching modes in the order listed below and adjusting the corresponding trimmer for the frequency in
All four of mine measure close to 1.2v p/p Steve G3TXQ On 24/03/2014 20:06, Thomas Kuehl wrote: Hi, Does anyone know what the correct peak-to-peak output level is for a properly working Corsair II PT