FPU7030 ADDITIONAL OPERATING INFORMATION PAGE 1
Additional operating information for
FPU7030 and NB7030 options.
1Contents
2 Introduction and options ………………….. 1
2-1 Overview
2-2 Memory idents
2-3 New timers
2-4 Noise blanker
2-5 Notch filter
2-6 Menu structure
3 Configuration menu ………………………… 3
3-1 New entries
3-2 Setting up the NB7030 option
4 Memory extensions ………………………… 4
4-1 More memories
4-2 Text identification
4-3 Ident preview
4-4 Ident search
4-5 Memory editor
4-6 Memory indexing
5 Timer extensions …………………………… 6
5-1 Setting the clock time and date
5-2 Timer operation
5-3 Setting the timers
6 Noise blanker operation …………………… 7
6-1 Option configuration
6-2 Noise blanker operation
6-3 Noise blanker menu
7 Notch filter operation ………………………. 7
7-1 Option configuration
7-2 Notch filter operation
7-3 Notch filter menu
8 Option specifications ….………..…………. 8
2 Introduction and Options
2-1 Overview
This supplement to the AR7030 Operating Manual covers
the functional changes and extensions that are due to the
enhanced processor (FPU7030). The enhanced processor
is required to operate the Notch Filter and Noise Blanker
options, but a receiver without the NB7030 option board
may still use the enhanced processor to gain extra
memory and timer functions.
The standard AR7030 manual covers the operating
principles of the receiver and these remain largely
unchanged with the enhanced processor. New users
should use the standard manual to become familiar with
the set, referring to this supplement if there seems to be a
discrepancy between the manual and the receiver’s
behaviour. Experienced users should find that the new
features fit quite seamlessly into the operating method,
although some functions may have moved or require an
extra button press now.
The next few sections give an outline of the new features
and the terms used for them. Of particular relevance is a
new menu structure diagram (section
2-6
) which replaces
diagram
2-4
in the standard operating manual.
2-2 Memory idents
The receiver’s memory capability is increased to 400
memories each storing frequency, mode, filter, PBS, AGC
and squelch settings. Additionally each memory can store
a textual identifier (up to 14 characters long) to aid station
identification. A new memory editor function using the
usual copy and paste operations is incorporated to make
management of the frequencies and identifiers easy. Two
extra features can be added to the receiver’s normal
operation making use of the text identifiers :-
1)
Ident Preview
displays the text ident for three
seconds whenever a memory is selected or previewed.
2)
Ident Search
checks the frequency stored in all of the
memories for a close match to the currently tuned
frequency and, if one is found, displays the appropriate
text ident for 10 seconds.
2-3 New timers
The clock in the receiver has been extended to include
date and month, and ten, one-year timer memories have
been added. These multi-timers will recall a specified
receiver memory at the start time and then run the
receiver for a given period allowing unattended recording
of several programs from several stations.
2-4 Noise blanker
The impulse noise blanker operates in the IF system of
the receiver to reduce the effects of short-duration noise
pulses. With adjustable threshold and two selectable
blanking periods the NB7030 will cope with a wide range
of noise and signal conditions. Most importantly, the
noise blanker reduces the effect of noise spikes on the
receiver’s AGC system, preventing it quietening after a
spike. Additional audio control circuits in the noise
blanker allow successful operation in AM and Sync
modes as well as SSB and CW.
2-5 Notch filter
The audio notch filter in the NB7030 is manually tuneable
from 150Hz to 6kHz and will typically offer more than
50dB of rejection to unwanted heterodynes. A variety of
automatic facilities are incorporated to make the notch
quick and easy to use - the tuning rate slows down when
a signal is detected close to the notch frequency reducing
the chances of tuning through and missing the signal,
and a signal tracking facility is available that will finish the
fine tuning after coarse manual tuning. This will also track
wandering heterodynes or move the notch with the
receiver tuning in SSB and CW modes (provided the
receiver is tuned slowly). A fully automatic notch search
form 300Hz to 6kHz can be started, with the notch
settling on the first steady heterodyne it finds.
AR7030
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