Jan Martin Nöding
Vaagsbygd, Norway/Europe
m3. RF signal-, noise and signal generators
m1. LC-,
Q-meters
m2. RF level
meters, attenuators and dividers
m11.
Grid-dipmeters and xtal testers
m12. RF power
meters
m22. Old
measuring instruments
m23
S/N-meters
c. Technical reflections
(Reflecties door LA8AK)
f) Boatanchors/ Radio surplus
equipment
L. VLF, MF and 136kHz equipment ideas
3.0
You'll never get all the transitions you
need!
Have collected coax-connector-transitions for 30 years.
Items described on other pages:
*
White noise power generator (0.5mV at 3kHz bandwidth), see page C13
*
Test purpose external product detector for 50kHz-1MHz, see page C13
#3.1)
Power modules to amplify signal from VHF/UHF
signal generator
Power amplifiers using power modules for 144 and 432MHz requiring
not more than 10mW drive, see info on page d32
3.2)
80m power signal generator
 a) |
 b) Data for EL84/6BQ5 Sri, N/A now |
80m Power generator using
6BQ5/EL84
It was made by LA7MI Stein Torp to test toroid ferrite
cores to be used in many of his solidstate transmitter
and transceiver projects
3.3)
VHF signal generator for CW/SSB tests
It was a problem to find 2m signal generator with sufficient
stability for ssb/cw 25 years ago, while an RF generator was
easier to get. Here is my up-converter using SBL1/SRA1. The
oscillator with 43.333Mhz xtal produces 130MHz to mix
with 14MHz from the generator, to give a signal on 144MHz. The
mixer has 7dB loss. To make it easy, I added
attenuator on the input and output for total 20dB lower level
than the level generator has. To convert from dBU (600 ohm
reference level, 0.775V = 0dB) to dBm (50W)
you must add an attenuator of 10*log (R1/R2), where R1=600W.
And if the generator has 75ohm impedance you should use a
minimum-loss-pad.
#3.4) Rohde&Schwartz SMLM
VHF power signal-generator improvement
R&S SMLM
(high power VHF generator) and similar instruments use high
voltage regulators.......
Surplus instruments often have valve type regulators, they may
last for many years, but may cause serious problem when
the smaller regulator valve passes to the Happy Hunting Grounds,
the series element doesn't cause any other problems
than it is no output voltage, but the small valve causes the
series element to draw full current and electrolytics and
resistors
at the regulated voltage is damaged. It is several ways to avoid
such problems, but the manufacturers are not concerned.
So I have nver seen any precautions. My solution is to use solid
state replacement. Z20 means 20V zener diode.
Since it was done around 1985 the semiconductors may be somewhat
different from what I would use today. It is a
good practice to use a cascode combination of a high
current-grain transistor in series with a higher voltage device.
 |
 |
Had been looking for this instrument to go with
Siemens 3W518 and 3D229 for 25 years, just curious
what it looked like, now I don't have the level generator any
more.... Have no documents for it.
#3.21)
SHF klystron type generator
HP623B The only instrument we had
for 6cm when we started experiments 20 years ago. While I don't
like klystron generators, it has some other goodies inside to
take care of.
noise calculation table and s/n-meters are moved
to page m23
pg-994. Index
for technical topics
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Updated: 2005.03.24