Were meant to make a dollar go as far as it could. Spawned many design innovations, some of which were strokes of genius. Otherwise it might have meant the bread line. A three dollar tube could equal a week's foodĪllowance. Out of reach for the average ham of 1936.
It was a financially difficult time as well, and many of these more advanced designs were just
TRF type receivers were grudgingly being given upįor the more sophisticated superhets, both in the amateur and in the Broadcast industry. This type of receiver represents a period of technological crossroads, a time when old schemesĪnd philosophies were giving way to new ones. Most of your money will be spent on niceties like vernier dials orĪuthentic antique parts as you choose to incorporate them. Price: Since parts are not really that critical or numerous, the cost of construction These radios so far, and each one averaged two afternoons of construction time. Coils are few, easy to make, and permanent. Selectivity) thereby presenting the detector with an amplified signal.Ĭonstruction: This receiver is no more difficult to build than any two or three tube Sensitivity: The front-end provides some conversion gain ( as well as increased Band changing is just a matter of switching a crystal, not a coil. Tuning: The tuning rate is constant for all bands because the detector tuning range The detector is allowed to operate under a more constant load Generation, keeping varying antenna reactance from affecting the tuning and loading Stability: The detector is isolated from the antenna, greatly reducing signal With the resultant higher Q tuned circuits there is Selectivity: The detector is allowed to operate on a low frequency, where these There are many advantages to this scheme: 1 (.bmp) can best be described as an RF converter followed by a tunable On a bed-side table, plug in and GO! And, I wanted it to be as simple as the regens, But for 20 meters, I wanted something that I could throw Once bolted down and grounded and adjusted, That my two stage regenerative rigs would be especially sensitive with small antennas.īut at frequencies much higher than 40 meters, they were cranky things to tote around,Īnd required a stable operating environment. That being: my only antenna just might be a clip lead to a window screen. I missed being able to keep up with the ham activities, and I wantedĪn inexpensive yet sensitive receiver which could operate under hotel room conditions. This project was the result of living on the road as a National Trainer for a large It than your standard two or three tube 'gennie. " Blooper Nostalgia" articles again? Well. Old receiver which may surprise you in performance.
Have you been wanting to make something the other chaps on the net don't have?įeel like re-inventing the wheel? Here is a rather "novel" version of a traditional Looking for something new to do with those old tubes collecting dust in the junk box? Contents View Photos View Circuit What is it? A Little Background Construction Notes Winding the IF Transformers Circuit Description Circuit Layout Set-Up and Operation Added Comments Helps and Resources Summary Comments