- Small VHF Transmitter - 3 Updates
- FRANCE NEON SIGN TRANSFORMER - 1 Update
| Michael_A_Terrell <terrell.michael.a@gmail.com>: Sep 02 02:56PM -0400 > Thank you all for the information and suggestions. I will be able to test the concept with our big Sony CRT type TV we brought back from Saudi as it has an on-board OTA tuner with NTSC/PAL/SECAM compatibility. So, I will report back when it arrives from Ranger, TX. And. after Kutztown, I will report on range. One thing that wasn't mentioned. The output level is +35 to +45 dB. That can damage some TV tuners. A pair of 20 dB pads in series will give you an output of -5 to +5 dB which is the normal range for tuners. Even when connected to an antenna, you may want one 20 dB pad to limit the range. The only 75 ohm pads that I have on hand are 6 dB. If I had any 20 dB available I would send you some. It would take seven of the 6 dB pads to get the output into the normal range. Maybe Jeff has a couple that he can spare,if you don't already have them? A last resort is to make your own. 20 dB per stage is the most you want to homebrew, per stage. Above that requires careful positioning of the leads, and extra shielding. RF Cafe has an online calculator for both Tee and PI types. Set the input and output both to 75 Ohms, then enter the attenuation, per stage. Then click the 'Calculate' button. You are probably familiar with the formulas but some of the others who are reading the thread, aren't. <https://www.rfcafe.com/references/calculators/attenuator-calculator.htm> -- Never piss off an Engineer! They don't get mad. They don't get even. They go for over unity! ;-) |
| Michael_A_Terrell <terrell.michael.a@gmail.com>: Sep 02 03:02PM -0400 Clifford Heath wrote: > and pick it up at our warehouse" (40 minutes drive away). I've watched > couriers delivering such notices, rather than walk the ten steps to > the front door and ring the doorbell. I have a Fedex account. They USED to email me the day before a delivery was made. They don't even do that, now. -- Never piss off an Engineer! They don't get mad. They don't get even. They go for over unity! ;-) |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Sep 03 05:59AM -0700 Thanks for the tip. I am not about to connect the TV directly to the modulator it will be two floors and about 100' away by direct line, and the output will be via rabbit-ear antenna. At Kutztown, I will be expected to cover a bit over two acres, and I will be feeding, almost exclusively, tube-based vintage devices. But if I overload the Sony, I will snag (an) F-connector pad(s) as needed. Thanks again! Peter Wieck Melrose Park, PA |
| amdx <amdx@knology.net>: Sep 02 12:51PM -0500 On 8/31/2020 2:18 PM, Roy Buskirk wrote: > Can anyone tell me what these 4 leads do and how to reconnect them, once the SCGFP potted module is removed. > My purpose is to convert this transformer for use as a Fractal Wood Burning System > Thank you - Roy I'm assuming since its old, it is all wire. No Idea, but is there continuity between blue and bl/wh ? B/W and OR? Or and OR/W? Which ones have the highest resistance? Does BL and BL/W have equal resistance to OR and OR/W? Curious minds want to know. Mikek -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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