EMRFD Chapter 9 Errata.
Chapter 9 figures: (This applies to the entire chapter.) Many of the schematics in this chapter
are missing the semiconductor types used. The usual NPN is a
2N3904 while the 2N3906 is the PNP. The JFET of choice is
the J310, or U310 for RF. The op-amps are LM837N or 5532
with the LM837N preferred for early stages where noise is
critical. A 10 pF chip capacitor between op-amp output and the
inverting input will usually cure instability. (24Feb03,
update 2Mar03, update 17Apr9)
p9.6, Fig 9.7G. There is a corner of
the box missing, just above the "G". (20Mar03)
p9.10, 2.4 inch up from bottom of text column
3: Replace "and it's transmitted signal..." with "and its transmitted signal..."
p9.25, Fig 9.38. The oscillator FET is
a J310, not a 4310. (24Feb03)
p9.29, Fig 9.49. The caption is not
correct. The caption should read "Phase
errors of Fig 9.48 network pair." (20Mar03)
p9.29, Fig. 9.50. The caption is not correct.
The caption should read "A
pair of all-pass networks that provide at least 21 dB
suppression from 360 to 2050 Hz." (20Mar03)
p9.34, Fig 9.62. The caption is not correct.
The caption should read "A
basic miniR2 schematic. This simplified version uses
some different parts values and requires matching of the
Fig 9.62. The problem is still here.
The problem has to do with the TUF-1 and TUF-3 mixers which have
4 pins. A PC layout will have 4 holes in a row. But
this does not mean that it can be shoved into the board in
either possible way. This figure should explain the nature
of the mixer. Essentially, the pin that is attached to
the mixer can is the grounded one and should go into the PC
board hole that attaches to ground. It's not complicated
if you look at the package and then the schematic.
The proper circuit is (17April09)
Fig 9.62. There are resistor and
capacitor values missing for the first op-amp in the signal
chain in both channels. Both channels are, of course,
identical. The feedback resistor is 100K, the input
R is 27K, and the capacitor is 0.12 uF. (These are the
values extracted from Fig 9.66.) The op-amp type used is
a 5532 or similar low-noise part. (17 Oct 05)
Fig 9.62. There
continue to be missing component values related to the filter at
the bottom of the figure. A proper schematic is shown here.
9.62, lower right part of drawing. There is a resistor in
the 12 volt supply line without a value. 100
Ohms would probably work fine here. It's a decoupling
element. (My personal take on this would be to add
another 100 uF capacitor to ground on the left side of this
p9.35, Fig 9.64. L1 in the
figure mentions 36t on a T30-6. This should be ignored;
it is a remnant from early drafting and early experiments.
The frequency dependent data in the table should be
p9.36. Fig 9.66.
This problem remains. The problem has to do with the TUF-1
and TUF-3 mixers which have 4 pins. A PC layout will
have 4 holes in a row. But this does not mean that
it can be shoved into the board in either possible way.
This figure should explain the nature of the mixer.
and the circuit should be (17Apr9)
9.69. The two output capacitors
at the top of the page, connected between the op-amp outputs and
10k resistors, should be 10 uF electrolytic. The 0.1uF value
shown in the schematic is a typographical error. Since these
capacitors are after the summing network in the phasing receiver,
they are non critical, but should be near 10 uF for the ASP board
to have a wide frequency response when driving medium impedance
loads near 500 ohms. They are clearly and correctly shown as
electrolytics in both the layout view figure 9.70 and the
photograph figure 9.71.
9.74. Two dots are missing in the schematic. Add
the dots as shown in red. (16Aug03)
middle col., 2.5 inches up from bottom. Replace "needed for
to optimize" with "needed to optimize" (16Dec03)
9.78. The power supply decoupling resistor in the lower
right corner of the schematic should be 10 Ohms rather than 10K.
p9.46, Fig 9.83. Same problem with TUF mixers. The problem
has to do with the TUF-1 and TUF-3 mixers which have 4
pins. A PC layout will have 4 holes in a row.
But this does not mean that it can be shoved into
the board in either possible way. This figure should
explain the nature of the mixer.
col, 3.0 inches down from text top: Replace "1.414 time"
with "1.414 times" (16Dec03)