The HP 70621A bore provides a low-noise, high-gain addition date that can be acclimated in advanced of an RF area in HP70K systems. The 70621A provides addition of signals from 100 kHz to 2.9 GHz, and is about acclimated in affiliation with a 70904A module. By abacus pre-amplification, arrangement babble can be bargain by 6–11 dB, and acuteness can be bigger by about 20 dB. Pre-amplification can additionally be acclimated after, before, or both afore and afterwards a pre-selector.
The 70621A additionally provides a 28 VDC achievement to ability an RF babble source. Aback a babble antecedent is accompanying with the 70621A, the bandpass/rejection characteristics of filters and the breadth of amplifiers can be calmly activated after acute a tracking generator.
Using an chip preamplifier has several advantages aback compared to alien arresting processing. The 70621A automatically calibrates altitude units displayed on-screen, corrects for accretion and flatness, adjusts IF assets as needed, and adjusts RF abrasion to ensure that best mixer levels are not exceeded.
The aloft apparatus arresting on this ancillary are, from larboard to right:
K1 — Transfer About-face AssemblyA5 — RF Amplifier Assembly
A closeup of the RF Amplifier Assembly is apparent below:
The RF INPUT from the advanced console is baffled to the Alteration About-face Assembly (K1), which allows the amplifier to be bypassed. Aback not bypassed, the arresting is baffled through a abundance limiter, which ensures that signals aloft 3 GHz are not passed, again through the RF Amplifier Assembly (A5). The achievement of the RF Amplifier Assembly (A5) is again baffled aback through the Alteration About-face Assembly (K1), to the RF OUTPUT on the advanced panel.
The aloft apparatus arresting on this ancillary are:
A2 — Controller/Power Supply Lath Assembly.
This lath controls the bypass switch, generates and switches the 28 VDC for an alien babble source, and generates voltages appropriate for the amplifier.
The block diagram of the 70621A is:
Here we can see the about-face drivers and babble antecedent drivers, and how the Alteration About-face Assembly (K1) switches the RF Amplifier Assembly (A5) in and out of the circuit.
Option H50 replaces K1 with two abstracted bake switches, eliminates the babble antecedent output, and adds accoutrement for an alien cleft clarify afore the amplifier input.
The RF INPUT from the advanced console is baffled to the aboriginal alteration switch, which routes it to a advanced console SIGNAL OUTPUT or to the rear console EXT NOTCH FILTER OUTPUT connector. The rear console EXT NOTCH FILTER INPUT adapter is baffled through RF Amplifier Assembly (A5) to the additional alteration switch. The advanced console RF OUTPUT is again switched amid the amplifier achievement or the advanced console SIGNAL INPUT connector.
If the advanced console SIGNAL INPUT and SIGNAL OUTPUT connectors are affiliated together, this finer allows the amplifier to be bypassed. If the two rear console connectors are additionally affiliated application a 3GHz abundance limiter, the Option H50 70621A is functionally equivilent to a banal 70621A.
Typically, the 70621A is configured as a bondservant bore beneath the 70900A or 70900B. It would be absorbing to analysis to see if the bore is accessible aback configured as a master, and if addition and/or the babble antecedent voltage achievement can be apart controlled.
The 70621A additionally provides a acceptable starting point for architecture semi-custom amplification, clarification and RF processing subsystems. However, this will alone be advantageous if the bore can run apart from the spectrum analyzer, contrarily the offsets and corrections will aftereffect in incorrect results.
Installation and Verification Manual:
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