This has given me the best results, although if I don't want to use the "Baldies," I can connect up a Hi-Z magnetic cone speaker like a Radiola 100A which then eliminates the need for an audio output transformer and provides ample volume (the Hi-Z speaker solenoid coils connect between AF plate and B - just like an audio output transformer.) The RHM functions quite well with 75 year old components - every part was the best that was available at the time.Today, the RHM performance seems antiquated and crude but in 1932 it was "state-of -the-art" and the fact that the receiver is still operating and is still fairly accurate in its dial readout is testament to National's build quality and Herbert Hoover Jr. This same design team again worked together in 1934, producing the famous HRO receiver.Many other components are recognizable as exclusive-RCA parts and included the "Magic Eye" cathode ray tuning indicator.RCA included a BFO, a sensitivity control, a noise suppressor circuit and a headset output jack - all necessities for a communication receiver.The RIO didn't use plug-in coils but had two switched tuning ranges that covered frequencies below 500kc.
Wenn du auf unsere Webseite klickst oder hier navigierst, stimmst du der Erfassung von Informationen durch Cookies auf und außerhalb von Facebook zu.The AGS was upgraded with newer tube types and other changes during its short production life (probably two or three production runs totaling no more than 300 receivers.) The major change was with the introduction of the AGS-X that added a front panel BFO control and a James Lamb type crystal filter to the receiver.In 1934, optional 10 meter coils were added as the AGS frequency coverage was increased to reflect the needs of a "ham receiver" - although at 5, not many hams could afford it.National got the contract for the ground-based airport receivers. and his West Coast design team were involved in some of the electronic engineering work of the new receiver that was designated RHM.The RHM was National's first superhet and it had some of the features that were to become National's trade-mark.