EMRFD Chapter 2 Errata.
(18 Aug 18)
p2.2, Fig 2.3.
The diode in the figure has the battery polarity wrong.
The correct figure is shown below. (27Sept09)
p2.2, right col, 0.8
inches down from top of text: "collector" becomes
p2.4, left col, 2.1 inches down from text
top. The bxIb should be (beta)xIb where (beta)
is the Greek letter and the b in Ib is a subscript (26Mar03)
p2.4, left col, 3.2 inches down from
top of text: This should be ".....11.4 V across 100
k-Ohm, or 114 uA. If
transistor beta=100, the collector current is 11.4 mA."
Error was in the m and u related to milli and micro amp. (24Feb03)
p2.4, right col, 4 lines up from text
bottom. Replace mF with uF. (microfarad) (24Feb03)
p2.5, right col, 0.8 inch down from text
top: replace "N-Channel" with "N-channel"
p2.5, right col, 0.8 inch down from
text top. Replace JET with JFET. (15 Jan 10)
p2.6, left col, almost
at bottom: That current is 752 uA, not mA. Also,
base current is 19 uA, not mA. (24Feb03)
p2.6, Eq 2.13.
There should be a minus sign ahead of this equation, for gm
is a positive value and Vp is negative. (8May07)
p2.6, JFET analysis, General
comments: The equations that describe
JFET current contain the term Vsg. This is the source
voltage with respect to the gate, or Vs-Vg.
Fig 2.19 includes an equation that
is called the "Basic FET equation." This has a
positive sign within the bracket. If the equation had
been written in terms of Vgs (gate voltage with respect to
the source) there would be a negative sign. The key
points to keep in mind are that Vp is negative (for an N
channel depletion mode JFET) and that Vgs=-Vsg.
Here's a summary of useful JFET equations. This is clarification info. It is
not an errata.
p2.7, left col, 0.5
inch down from text top. Change Vbe in the equation
to be a simple Vb. Either would work in the case of
Fig 2.21A. But Figures 2.21C and D are both
models that include the bias current dependent emitter
resistance re. Fig 2.21B relates to biasing
rather than signal amplification. (6Aug04)
2.20. Use this in place of that shown.
right col, 1.5 inches down from text top: "effected"
becomes "affected" (26Mar03)
p2.9, right col, 2.5 inches up from text
bottom: "role" becomes "roll" (24Feb03)
p2.9, Fig 2.28
caption: "hybrid-p" should be "hybrid-pi" where "pi"
is the Greek letter. (26Mar03)
p2.11, first word on
page: "reasoning" becomes "reasoning"
without . italics (26Mar03)
p2.12, left col, 1"
up from bottom. Change 0.5V to .05V.
Make the same change on bottom
line in column.
p2.15, Fig. 2.42:
Those are homebrew and surplus terminators rather
than attenuators. (24Feb03)
p2.15, middle column,
1.8 inches down from top of text: change figure ref.
Should read "In Fig 2.40 we saw ...." (24Feb03)
p2.16, middle col,
equation 2.30. Replace Gamma with the absolute
value of Gamma. Hence
left col, 3.1 inches down from text top: replace "effect"
with "affect" (9Dec03)
2.55, caption. Change "grow with
increasing..." to "drop with increasing...".
middle col, 1.2 inches down from top of text: "some of
he" becomes "some of the" (24Feb03)
p2.21, col 1, 3.0
inches down from text top. Replace "the earlier
equation" with "equation 2.35" (8Feb04)
col, 1.9 inches up from text bottom: replace "f1, f1, and
f2" with "f1, f1 again, and f2" where all of these numbers
are subscripts. Analytically, this means is that IMD
order is the sum of the exponents in the related equations.
p2.22, col 3, 3.4 inches down from text top.
Remove the word "nonlinear." (12July03)
p2.23, col1, 2.0 inches down from text top.
Replace "is a bit stronger" with "has lower IMD"
p2.25, caption for Table 2.2: should be
"r=1.3 Ohms" not "r=1.3 W" (24Feb03)
col, 1.0 inch down from text top. Replace sentence
beginning with "This IC..." It should become: This
IC should not be used without a dropping resistor."
col, 1.6 inches down from text top. Replace Greek Omega
with "W" for watt. (12July03)
p2.29, Fig. 2.88. The leaded
capacitors have 0.1 inch leads, not 4 inch. Also,
the chip cap is a size 0805, not 0905. (24Feb03)
p2.30, top of left col:
replace "run" with "printed circuit run or
p2.31, Top of middle col. Replace
"have Q" with "have low Q". (29Aug9)
p2.33, middle col, 0.4 inches up
from text bottom. Change "diode purpose" to "diode's
p2.36, Fig 2.97 Caption.
Change the units for L1, L2, and L3 from mH to uH.
(While L1 and L2 are correct in the Third Printing, L3 is
still shown as 15 mH. It should be 15 microhenry.
p2.36, bottom of text and p2.37
text top: The paragraph now reads: "The
amplifier is set up for Class-C operation, although it could be
modified for class AB linear operation with little other change
required. Linear biasing is discussed below."
Change the paragraph to become "The amplifier is
set up for Class C operation. It is easily modified for
AB linear service with the methods outlined below."
Figure 2.100. Alter the figure to include the 500
uF cap in A. Change text in caption, changing mF to uF.
(That's microfarad, not millifarad.)
p2.37, right column,
3.7 inches down from text top: replace "thermal
communications" with "thermal contact" (9Dec03)
p2.37, right col, 3.8 inches down from text top:
Replace "Some designs us a ...." with "Some designs
use a ....." (17April09)
right column, 0.9 inches up from text bottom: replace
"network the Beginner's" with "network for the Beginner's"
p2.40, Fig 2.105 caption, third line:
Change drain to collector. (12July03)
p2.40, col 3, 0.4
inches up from text bottom. Change p-network to
p2.41, right column, 1.2 inches up from text bottom:
replace "This loss of no" with "This loss is of
Fig 2.112. This schematic describes a CW
Power amplifier that has been a major work horse for years at
w7zoi. The schematic uses a wide band transmission
line transformer, T2, followed by a double pi
network. A T/R switch is included in the
amplifier consisting of a series tuned circuit (C4 and L7)
with 6 diodes. This scheme has always worked
well. However, when the amplifier was built with
the alternative output match shown in the schematic, the T/R
circuit does not function well. The power amplifier
will develop over 50 watts of output, but the signal reaching
the receiver in key-up state is severely attenuated.
A relay T/R system, or a T/R using PIN diodes is
recommended when the alternative output is used. The
circuit in Fig 6.127B is recommended where cheap rectifier
diodes are used. The paper in QEX for May, 1995,
provides greater detail. This paper is included on the
EMRFD CD as qex199505.pdf. (18Aug2018)