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RF Keys/Output
DESCRIPTION
All RF power functions, except for power level, are controlled by these keys; and the RF output port is
contained in this group.
PANEL LAYOUT
- ON/OFF---
ATTEN
ATten
[QJIQJISJISJIQJ
* SNP
SLOPE
RF
RF OUTPUT —
O,
FUNCTIONS
TAMTD MKR1 (HP-IB:
AK1 turns on amplitude markers, AKO turns off amplitude markers) on a CRT
display. When the markers are activated after an [INSTR PRESET], markers [M1]...[M5] appear as
intensified dots on a CRT display; press [AMTD MKR] to change all of the markers to amplitude
spikes. Press [AMTD MKR] again to return to intensified-dot markers.
rSHIFTl FAMTD MRK] (HP-IB:
SHAK) causes an instantaneous execution of the peaking function,
when the HP 8340B/41B is in CW or manual mode. This is one-time implementation of peaking, where
the function is quickly turned on then turned off. Peaking is explained in the next paragraph.
rPEAK] (HP-IB-
RP1 turns on peaking, RPO turns off peaking) aligns the output filter (SYTM) so that
its passband is centered on the RF output, in CW or manual-sweep mode. Peaking is used to obtain
the maximum available power and spectral purity, and best pulse envelopes, at a given frequency.
Press rPEAKl and the H P 8340B/41B will automatically peak the present CW frequency, and continue
to peak new frequencies as they are entered by the [KNOB], or the [STEP] keys, or the numerica keys
(with a terminator key). If [PEAK] is on for an extended time, the peaking function will automatically re¬
peak every 7 minutes. Press [PEAK] again to cancel this function. When [PEAK] is activated, the HP
8340B/41B performs a coarse alignment, and then a fine alignment that begins at the final setting of
the coarse search; [SHIFT] [AMTD MKR] initiates only a fine alignment which begins f the present
instrument setting, [SHIFT] [AMTD MKR] is faster, but has less adjustment range than [PEAK].
[SHIFT] [PEAK], described in the next paragraph, is a related function.
TSHIFTl TPEAK] (HP-IB:
SHRP1 is a more extensive version of peaking [PEAK] (which requires a
fraction of a second to implement), aligns the output filter with a single CW frequency, while [S
]
[PEAK] aliqns all of the YTM tracking calibration constants and requires 5-10 seconds to implement.
Use rSHIFT] [PEAK] to enhance the power output and spectral purity of swept modes, and to improve
tracking performance (especially in harsh environments having wide temperature vanat|ons). Press
[SHIFT] [PEAK], which will cause "AUTO TRACKING" to appear in the ENTRY D SPLAY. AUTO
TRACKING" will disappear after 5-10 seconds when the calibration has been completed.
Figure 3-17.
RF Keys/Output (1 of 3)
HP 8340B/41B
Operating Information
3-39
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