In fact, 40m is a highly recommended band to start out on. It works very reliably up to about miles during the day, a bit further at night, and if you get it high enough, can work really well at night.
Plus it's less crowded and generally more friendly than 20m. If you really want voice to anywhere in the world, you'll want a huge yagi antenna on a large tower, transmitting at the full legal power in a quiet RF area.
Other than that, you will have some compromise. Voice needs an SNR of something like to be effective, while digital can often receive signals with a signal of dB below the noise floor. Scruffy Scruffy 79 3 3 bronze badges. Why not just say he needs a cell phone with a good long distance plan? Or why not just recommended some internet based chat? I think this answer misses the point of the question being directed at amateur radio.
He's likely looking for something that could work when satellites are down, internet is inaccessible or he may be looking for a specific setup goal to work towards and train with, given some recommendations. Featured on Meta. Feedback post: New moderator reinstatement and appeal process revisions. New post lock available on meta sites: Policy Lock.
Linked August Retrieved April 25, Retrieved June 12, Matthew C. Sittel's DX Page. Archived from the original on September 27, Retrieved April 26, Analog and digital audio broadcasting. C band K u band L band S band. Audio data compression Audio signal processing. History of radio International broadcasting. Comparison of radio systems. Categories : Radio frequency propagation. Stay in the right lane of a divided highway when you are several miles away from your next exit.
Nothing is more maddening than being in the left lane only to have a semi or two come up on the right and block the informational signs, and the exit. Especially if you have a full bladder. Be prepared for the time zone changes messing with your head. Use the trip counters : If you have a car that has two trip counters, use them both. Then after filling up, I clear that counter back to zero. My feet and ankles were swollen for a couple days, and it took me a week to fully recover.
Model 37 PC. This vessel is located in Massapequa, New York and is in great condition. She is also equipped with twin Mercruiser engines that have only hours. Mercury HO's with only hours. Brand new port side drive. Formula has maximized the cockpit layout on this model for entertaining and has created an elegant and sophisticated space below.
This is a top shelf family express whose aggressive good looks and sumptuous interior are designed to peal to upmarket cruisers. Built on a beamy deep V hull with prop prockets and a relatively modest 18 degrees of deadrise at the transom. The 37PC is wide open and spacious, headroom is excellent. The decore is quite elegant and the furnishings and appliances are first rate.
The cockpit has a U shape lounge which converts into a sun pad, wet bar, triple wide helm seat, can accommodate 10 passengers. With a hex inverter you could have a 2-inverter audio osc, a 2-inverter low frequency osc to sweep the audio tone and the final 2 inverters as an RF osc 74HC series would be fast enough for MHz although I would just use a 2 transistor transmitter Or variations on this general design.
A lower frequency to save power — lower speed CMOS can be multiplied by tuning the input stage of the final to a harmonic of that square wave output, but a simple discrete xal osc transmitter with a second output buffer stage would be about the same amount of work.
This site uses Akismet to reduce spam. Learn how your comment data is processed. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Learn more. Report comment. The crank itself could drive a wheel shaped in order to close the key with the SOS request. Yeah, shut it, jackass.
Coherer receiver for CW would be even more challenging…. Extremely cool hack. Needless to say, I will be asking him about this in the near future. Not really sure if anyone has tried or will try if a peizoeletric speaker would be better. Check his other projects. The parametric amplifiers should get more attention. Re: solar cell powered radios I have only Leave a Reply Cancel reply.Feb 23, · View credits, reviews, tracks and shop for the Vinyl release of A Thousand Miles Of Midnight (Phantom Radio Remixes) on Discogs.