4A - Revision history

Larry: /* Brochure */

2020-04-10T23:38:42Z

Brochure

Larry at 16:28, 1 April 2020

2020-04-01T16:28:51Z

Larry at 16:28, 1 April 2020

2020-04-01T16:28:16Z

Larry at 16:27, 1 April 2020

2020-04-01T16:27:30Z

Larry at 16:27, 1 April 2020

2020-04-01T16:27:03Z

Larry: /* Brochure */

2020-04-01T16:23:23Z

Brochure

Larry: /* Brochure */

2020-04-01T16:19:16Z

Brochure

Larry: /* Brochure */

2020-04-01T16:16:53Z

Brochure

Larry: /* Brochure */

2020-04-01T16:15:27Z

Brochure

Larry: /* As Advertised */

2020-04-01T15:58:44Z

As Advertised

← Older revision		Revision as of 23:38, 10 April 2020
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	== Brochure ==		== Brochure ==
−	*[http://collinsmuseum.org/brochures/brochure4a.php No. D111–1-35]	+	[[File:4A Brochure 1600px.jpg\|left\|thumb\|800px\|Brochure No. D111–5M-5-35]]
−	[[File:4A Brochure 1600px.jpg\|left\|thumb\|~~200px~~\|Brochure No. D111–5M-5-35]]

@@ Line 1: / Line 1: @@
-[[File:4A front m.jpg|right|300px|This unit is now in the UTC museum.]]
+[[File:4A front m.jpg|right|500px|This unit is now in the UTC museum.]]
 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 />

@@ Line 1: / Line 1: @@
-[[File:4A front m.jpg|right|600px|This unit is now in the UTC museum.]]
+[[File:4A front m.jpg|right|300px|This unit is now in the UTC museum.]]
 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 />

@@ Line 1: / Line 1: @@
 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 />
@@ Line 4: / Line 5: @@
 The production units were a bit different than the artifact shown in the first image.
 As production continued, the Power Amplifier Neutralization control was moved to the front panel as well as the crystal module. In addition, the front panel material changed from aluminum to Bakelite.
 [[File:4A upper-left m.jpg|center|Internal View]]
 [[File:4A bottom m.jpg|center|Bottom View]]

@@ Line 4: / Line 4: @@
 The production units were a bit different than the artifact shown in the first image.
 As production continued, the Power Amplifier Neutralization control was moved to the front panel as well as the crystal module. In addition, the front panel material changed from aluminum to Bakelite.
-[[File:4A front m.jpg|center|This unit is now in the UTC museum.]]
+[[File:4A front m.jpg|right|600px|This unit is now in the UTC museum.]]
 [[File:4A upper-left m.jpg|center|Internal View]]
 [[File:4A bottom m.jpg|center|Bottom View]]

@@ Line 24: / Line 24: @@
 == Brochure ==
 *[http://collinsmuseum.org/brochures/brochure4a.php No. D111&ndash;1-35]
-[[File:4A Brochure 1600px.jpg|left|thumb|200px|Brochure]]
+[[File:4A Brochure 1600px.jpg|left|thumb|200px|Brochure No. D111&ndash;5M-5-35]]

← Older revision		Revision as of 16:15, 1 April 2020
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	== Brochure ==		== Brochure ==
	*[http://collinsmuseum.org/brochures/brochure4a.php No. D111–1-35]		*[http://collinsmuseum.org/brochures/brochure4a.php No. D111–1-35]
		+	[[File:4A Brochure 1600px.jpg\|left\|Brochure]]

@@ Line 11: / Line 11: @@
 Like many home-assembled projects of the day - this unit had no top cover, sides or back. To protect yourself from live wires it was best to mount it into a rack.
 == 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, 1933 issue of <i>Collins Signal</i> magazine.</b></center>
 [[File:4A m.jpg|right|Its first appearance.]]
 <font color="red"><i>Ad Copy:</i></font> "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 mc. 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.
@@ Line 21: / Line 21: @@
 We have a few inquiries as to why we, do not incorporate the new "universal exciter" in some of our transmitters. The universal exciter is a very clever arrangement, but no advantage is found over our existing 4A and 1OB circuits. It should be remembered that the output of the universal exciter is scarcely high enough for serious transmission work, unless it is followed by another amplifier, whereas the 4A Transmitter puts out a relatively powerful signal and. it also contains dual power supplies, so that no additional equipment has to be purchased. <br />
 We strongly recommend the 4A Transmitter for the consideration of every amateur who wants the most efficient telegraph transmitter obtainable at a very moderate investment.
 == Brochure ==
 *[http://collinsmuseum.org/brochures/brochure4a.php No. D111&ndash;1-35]