Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- en:51j-4_-_revision [2024/09/21 20:25] – angelegt mb
+++ en:51j-4_-_revision [2024/09/21 20:29] (aktuell) – mb
@@ Zeile 1: / Zeile 1: @@
 ====== Collins 51J-4 S/N 1601======
-Manufactured by [[Collins Radio Comp., Cedar Rapids]].
+Manufactured by [[Collins|Collins Radio Comp., Cedar Rapids]].
 I got my Collins 51J-4 S/N 1601 from Walter K., it had been unused for years and stored in a dry warehouse.
@@ Zeile 8: / Zeile 8: @@
 {{:images:collins_51j4_1601_a.jpg?direct&600|Collins 51J-4 S/N 1601}}
 ===== Technical data =====
-* [[Principle]]: [[Double conversion superhet|double/triple conversion superhet]], [[IF]] 1.5-2.5 or 2.5-3.5 MHz, 500 kHz
+  * [[Principle]]: [[Double conversion superhet|double/triple conversion superhet]], [[IF]] 1.5-2.5 or 2.5-3.5 MHz, 500 kHz
-* [[Operation modes]]: [[A1]] with BFO, [[A3|AM (A3)]]
+  *  [[Operation modes]]: [[A1]] with BFO, [[A3|AM (A3)]]
-* [[Frequency range]]: 0.5 - 30.5 MHz
+  * [[Frequency range]]: 0.5 - 30.5 MHz
-* [[Frequency display]]: linear analogue display, 1 kHz reading accuracy
+  * [[Frequency display]]: linear analogue display, 1 kHz reading accuracy
-* [[Frequency memory]]: none
+  * [[Frequency memory]]: none
-* [[Signal strength indicator]]: [[S-meter]]
+  * [[Signal strength indicator]]: [[S-meter]]
-* [[Signal processing]]: [[RF gain]], [[AGC]], [[noise limiter]], [[crystal filter]] (Crystal Filter)
+  * [[Signal processing]]: [[RF gain]], [[AGC]], [[noise limiter]], [[crystal filter]]
-* [[Features]]: [[crystal calibrator]] 100 kHz
+  * [[Features]]: [[crystal calibrator]] 100 kHz
-* [[Sensitivity]]: [[A3|AM (A3)]] <5 μV / [[Selectivity]]: 1.5/4 kHz, 3 / 8.5 kHz, 6 / 14.4 kHz (-6/-60 dB)
+  * [[Sensitivity]]: [[A3|AM (A3)]] <5 μV / [[Selectivity]]: 1.5/4 kHz, 3 / 8.5 kHz, 6 / 14.4 kHz (-6/-60 dB)
 ==== Power supply ====
-* [[Mains operation]]: 110, 220 V
+  * [[Mains operation]]: 110, 220 V
 ==== Dimensions ====
-* 536 x 317 x 333 mm, weight 28.5 kg (without cabinet 21.3 kg)
+  * 536 x 317 x 333 mm, weight 28.5 kg (without cabinet 21.3 kg)
 ==== Accessories ====
@@ Zeile 32: / Zeile 32: @@
 After loosening three wing nuts, the upper metal cover can be removed, the chassis is clean, the adjustment tool for the PTO is present in its holder.
-The angled Phillips screwdriver on the back of the receiver and the four Allen keys for removing the buttons in their holders on the inside of the cover plate are also included.
+The angled Philips screwdriver on the back of the receiver and the four Allen keys for removing the buttons in their holders on the inside of the cover plate are also included.
 The PTO is the 70E-15 version belonging to the 51J-4 with the CR suffix; with this improved PTO the problems with the uncorrectable error at the scale end points (EPE) do not occur, the display of the receiver can practically always be set to the correct frequency.
-{{ :images:collins_51j4_1601_e.jpg?direct&200|Collins 51J-4 S/N 1601}}
+{{ :images:collins_51j4_1601_d.jpg?direct&200|Collins 51J-4 S/N 1601}}
 Next to the PTO under a retaining bracket are the three mechanical IF filters in their angular metal cabinets.
@@ Zeile 60: / Zeile 60: @@
 ==== Tube configuration ====
-V001 and V002 ([[6BA6]], VFO 2-3 MHz); \\
+==== Valve setup ====
-V101 ([[6AK5]], RF preamplifier); V102 ([[6BE6]], 1st mixer at 2.5->1.5 MHz); V103 ([[6BE6]], 2nd mixer, band I); V105 ([[6AK5]], 12 MHz oscillator); V106 ([[6BE6]], 3rd mixer at 500 kHz)\\\
+V001 and V002 ([[de:6BA6]], VFO 2-3 MHz );
-V301 ([[6BA6]], 1st IF stage 500 kHz); V302 ([[6BA6]], 1st IF stage 500 kHz); V108 ([[6BA6]], 3rd IF stage); V109 ([[6BA6]], 4th IF stage); V110 ([[6BA6]], 2nd IF stage 500 kHz). IF stage); V110a ([[12AX7]], detector); V112b ([[12AX7]], noise limiter); V112a ([[12AX7]], LF preamplifier); V113 ([[6AQ5]], LF power amplifier)\\
+V101 ([[de:6AK5]], RF preamplifier); V102 ([[de:6BE6]], 1st mixer to 2.5 → 1.5 MHz ); V103 ([[de:6BE6]], 2nd mixer, Band I); V105 ([[de:6AK5]], 12 MHz oscillator); V106 ([[de:6BE6]], 3rd mixer to 500 kHz)
-V110a ([[12AX7]], 1st AGC amplifier); V111a ([[12AU7]], 2nd AGC amplifier; V111b ([[12AU7]], amplifier 500 kHz - IF output; V104 ([[6BA6]], crystal calibrator); V114 ([[6BA6]], BFO)\\\
+V301 ([[de:6BA6]], 1st IF amplifier 500 kHz); V302 ([[de:6BA6]], 2nd IF amplifier 500 kHz); V108 ([[de:6BA6]], 3rd IF amplifier); V109 ([[de:6BA6]], 4th IF amplifier); V110a ([[de:12AX7]], detector); V112b ([[de:12AX7]], Noise Limiter); V112a ([[de:12AX7]], AF preamplifier); V113 ([[de:6AQ5]], audio final amplifier)
-V115 ([[5V4G]], rectifier), V116 ([[0A2]], voltage stabiliser).
+V110a ([[de:12AX7]], 1st AGC amplifier); V111a ([[de:12AU7]], 2nd AGC amplifier; V111b ([[de:12AU7]], amplifier 500 kHz IF output; V104 ([[de:6BA6]], calibrator); V114 ([[de:6BA6]], BFO)\\
+V115 ([[de:5V4G]], mains rectifier), V116 ([[de:0A2]], voltage stabilizer).
 {{ :images:collins_51j4_1601_h.jpg?direct&300|Collins 51J-4 S/N 1601}}