Difference between revisions of "4A"
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This Transmitter was introduced to the amateur radio community in the October 1933 issue of QST.<br /> | This Transmitter was introduced to the amateur radio community in the October 1933 issue of QST.<br /> | ||
| − | + | Crystal Controlled, CW transmitter with built-in power supply for the 160 & 80 meter (28 watts), 40 meter (25 watts), and 20 meter (13.2 watts) amateur radio bands.<br /> | |
The crystal and associated band-changing coils were plugged from the top of the unit.<br /> | The crystal and associated band-changing coils were plugged from the top of the unit.<br /> | ||
| − | + | The production units were a bit different than the Museum's artifact as seen in the first first.<br /> | |
The Power Amplifier Neutralization control was moved to the front panel as well as the crystal module. | The Power Amplifier Neutralization control was moved to the front panel as well as the crystal module. | ||
[[File:4A front m.jpg|center|This unit is now in the UTC museum.]] | [[File:4A front m.jpg|center|This unit is now in the UTC museum.]] | ||
[[File:4A upper-left m.jpg|center|Internal View]] | [[File:4A upper-left m.jpg|center|Internal View]] | ||
== Construction == | == Construction == | ||
| − | The 4A was a kit, all parts included | + | The 4A was a kit, all parts included. However, you were responsible to purchase the tubes separately. |
Like many home-assembled projects of the day - this unit had no top cover, sides or back. | Like many home-assembled projects of the day - this unit had no top cover, sides or back. | ||
== As Advertised == | == As Advertised == | ||
<center><b>The 4A was first introduced in the April-August issue of <i>Collins Signal</i> magazine.</b></center> | <center><b>The 4A was first introduced in the April-August issue of <i>Collins Signal</i> magazine.</b></center> | ||
[[File:4A m.jpg|right|Its first appearance.]] | [[File:4A m.jpg|right|Its first appearance.]] | ||
| − | The 4A transmitter marks the entry of the COLLINS line in the extremely low-priced field. The 4A uses a 47 crystal oscillator and parallel 46's in the power amplifier permitting an output of 18 to 20 watts on 1.7, 3.5 or 7 me. The power amplifier is operated on the crystal frequency in each case. Despite its low cost, the 4A embodies the mechanical and electrical refinements found in the larger COLLINS transmitters. A separate power supply is used for the oscillator to reduce frequency "chirp." Standard COLLINS plug-in coils are employed. A single Weston meter is provided with a switching arrangement to read plate and grid currents. The 4A is ideal for an amateur who wants to start out with a minimum investment and yet have a transmitter which will deliver a high quality C. W. signal. The 4A can also serve as a stand-by transmitter in a high-powered station to be used when full power is not required. | + | Ad Copy - "The 4A transmitter marks the entry of the COLLINS line in the extremely low-priced field. The 4A uses a 47 crystal oscillator and parallel 46's in the power amplifier permitting an output of 18 to 20 watts on 1.7, 3.5 or 7 me. The power amplifier is operated on the crystal frequency in each case. Despite its low cost, the 4A embodies the mechanical and electrical refinements found in the larger COLLINS transmitters. A separate power supply is used for the oscillator to reduce frequency "chirp." Standard COLLINS plug-in coils are employed. A single Weston meter is provided with a switching arrangement to read plate and grid currents. The 4A is ideal for an amateur who wants to start out with a minimum investment and yet have a transmitter which will deliver a high quality C. W. signal. The 4A can also serve as a stand-by transmitter in a high-powered station to be used when full power is not required. |
| − | Really surprising results can be obtained and amateurs who are accustomed to think in terms of kilowatts can get a great deal of service and amusement from one of these little transmitters. | + | Really surprising results can be obtained and amateurs who are accustomed to think in terms of kilowatts can get a great deal of service and amusement from one of these little transmitters." |
Revision as of 21:14, 30 March 2020
This Transmitter was introduced to the amateur radio community in the October 1933 issue of QST.
Crystal Controlled, CW transmitter with built-in power supply for the 160 & 80 meter (28 watts), 40 meter (25 watts), and 20 meter (13.2 watts) amateur radio bands.
The crystal and associated band-changing coils were plugged from the top of the unit.
The production units were a bit different than the Museum's artifact as seen in the first first.
The Power Amplifier Neutralization control was moved to the front panel as well as the crystal module.
Construction
The 4A was a kit, all parts included. However, you were responsible to purchase the tubes separately. Like many home-assembled projects of the day - this unit had no top cover, sides or back.
As Advertised
Ad Copy - "The 4A transmitter marks the entry of the COLLINS line in the extremely low-priced field. The 4A uses a 47 crystal oscillator and parallel 46's in the power amplifier permitting an output of 18 to 20 watts on 1.7, 3.5 or 7 me. The power amplifier is operated on the crystal frequency in each case. Despite its low cost, the 4A embodies the mechanical and electrical refinements found in the larger COLLINS transmitters. A separate power supply is used for the oscillator to reduce frequency "chirp." Standard COLLINS plug-in coils are employed. A single Weston meter is provided with a switching arrangement to read plate and grid currents. The 4A is ideal for an amateur who wants to start out with a minimum investment and yet have a transmitter which will deliver a high quality C. W. signal. The 4A can also serve as a stand-by transmitter in a high-powered station to be used when full power is not required. Really surprising results can be obtained and amateurs who are accustomed to think in terms of kilowatts can get a great deal of service and amusement from one of these little transmitters."
