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The 4S2 and 4S2A front panels look the same, but they use different GR-874 input connectors. | The 4S2 and 4S2A front panels look the same, but they use different GR-874 input connectors. | ||
The 4S2 uses a short airline unique to the 4S2. | The 4S2 uses a short airline unique to the 4S2. | ||
The 4S2A uses the connector-to-board system described in US Patent 3,426,311 | The 4S2A uses the connector-to-board system described in [[Patent US 3426311A|US Patent 3,426,311]] and has some parts in common with the [[3T7]]. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Bandwidth | DC to 3.9 GHz }} | {{Spec | Bandwidth | DC to 3.9 GHz }} |