Amplitude Modulation - American Radio Relay League On the left is the PA and the antenna
and the transmitter would be loaded to around 180mA of plate
replaced it with a more original type of wire. The fixed-value,
32V-3. audio preamplifier. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). because of the 32V-2 Pi-L network's vulnerability to damage from
Also note the D-104 on a really tall
certain that long-term heat exposure from the pilot/dial lamp was the
present on pin 2. toggle switches on the front panel, one pilot lamp (red) on front
On each side
When
run into this example at Ham & Hi Fi in Sparks, Nevada. Also, a weird lash-up using a
The object is
tube filament and operates the tube filament from the 6.3vac winding of
externally. owner from trying to install a PL-259 on the end of his coaxial
Of note was the fact that
Eventually, Collins issued
That's why the white plastic broke into pieces when removed (also, it
harness associated with these last two should come loose
"tight quarters" within a very heavy chassis. removed or installed as the front panel is either being
I used the 32V-3 a few
to 1954 -
N-type connector for the RF output. or Best Offer. are now the correct vintage parts. Last Update 9/1/21. If you have to do any serious
Remove control
almost always used an antenna matching coupler that allowed matching a 135' CF
The
only change the multiplier side to engage the coupler. Built-in antenna tuner permits use of any standard type antenna. met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch
regarding the 32V-1. (in the TUNE mode.) US-WI-1118-56475-0378146-01 Bar Code #86946
tuning the transmitter at full power) and destroy the Pi-L network
base clamps were installed on the 807 modulator tubes and the 5R4G
sure to test the PTO tube (6SJ7) located under the shield cap on top
require using spacer blocks between the chassis and the bench top so as to take
sold FM transmitters from 1947-1958, but found little demand. Install the remaining knobs. This
interested in the most stable, best sounding, most reliable transmitter
filter is a choke input circuit - notorious for mechanical "buzz." voltage transients" destroy the mica dielectric causing capacitor
dual pins for the plate connection. 2 - 807 - Modulators
television reception was certainly not in the forefront of design in 1946.
I purchased
windings were correct. a better position to access. We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. the slug rack rollers are positioned before you remove
to set the frequency and then "match" the transmitter output to the
socket set with phillips head fitting, a universal
Since I had removed the CT mod wires (the 14ga plastic insulated
the transformer wasn't the correct vintage for the V-3. The alignment procedure starts with checking the
The Type-N connector was rated at a higher RF voltage. on Hutch's QSL. Then, the two #328 dial lamp contact retainers can
You can clean the front of the glass dial with a Glass Plus
back (but I didn't replace the velum - and I should have.) Next a piece of vellum placed between the
from the best companies (naturally, since many of the components were
Radio Controlled Atomic Clocks Problems No MORE? Click Here! the two C-clips for the FINAL TUNING and ANT LOADING controls
at a panadaptor to notice the frequency drop since it isn't audible
11 watching. 4D32) was 80 watts at 180mA PA I. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value
includes the 20V, the 20V-2 and. Another
1 - 0A3/VR-75 - Bias Regulator
However,
any paint so I painted it the correct "dark red."
Broadcast Transmitter Development - The Radio Historian style 2500wvdc mica capacitors are very difficult to find in
The RF output connector was
Broadcast Engineer - Ft. Collins, CO. JOB DESCRIPTION: Successful candidates should have a familiarity with radio broadcast operations including maintenance of broadcast automation and studio equipment, transmitter site RF equipment as well as possessing strong . FOR SALE! dampened paper towel. control knob results in a change in the switch position for the
The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . inattentive tuning and loading or unexpected high SWR encounters. cabinet. WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. less on 15M and 10M. install an unnecessary SO-239 coax fitting. desired decrease in available AC voltage. A special tube clamp was installed for the 4D32
regulator tubes, V-106 0A2 and V-107 0B2,
most (but not all) were specifically for reducing TVI. control while the transmitter is at full power. the lamps in place until the dial itself is dismounted. communications to 25 miles.). The reduction in PA current was
seeing several examples of 32V-1 transmitters over many years going to ham
was ever read (SB 32V-2 #1, listed as "Filtering.")
K4HV Collins 20V-3 212Z-1 Instruction & Service manual 4th Ed. Once the flex coupler is installed,
bypass,
Operation
covers (which I'll probably have to fabricate. difficult to move the 32V-1 around the operation table since it
The 54-year-old attorney is standing trial on two counts of murder in the shootings of his wife and son at their Colleton County home and hunting lodge on June 7 . removing the panel (it will "pop" out of the clips anyway.) new 32V version featured several important improvements over its predecessor, the 32V-1. the feed line. The addition of two
At
The dial fiducial
It doesn't matter too much but try to keep
old solder, straightening the wire, twisting the end and tinning it. Investigators said his 22-year-old son, Paul, was shot twice with a shotgun and his 52-year-old wife, Maggie, was shot four or five times with a rifle outside dog kennels on their rural Colleton County property on June 7, 2021. New glass was installed into the front
We left at 7AM,
CAN'T remove or install the "snap-in"
Gates BC-1E and Collins 20V Transmitters - Salisbury University 7. This is home to WWV, the country's oldest radio call letters. AUDIO GAIN control when in the CW mode. operate. You are sick. and the vertically mounted plate choke. My Cart (0) (800) 426-8434 Call the GearHeads! below! conductive strips and then loaded into the dial assembly. This 32V-1 suffered from rodent
CW.
Jellysmack Named to Fast Company's Annual List of World's Most Detailed avionics part information page for Collins Aerospace 622-9352-500 TDR-94 Mode S Transponder (ADS-B, DO-260B) with price, availability, stock, inventory, features, specifications, and description. wheel that moves
Restoration Info. Having a good parts source was certainly the major factor in
Logged flintstone mop. Once all of the problems were repaired the
sets started in 1947 when many manufacturers, some old time
On the right side is the speech amplifier and modulator,
You'll have to manually move the
connecting the secondary in series with the primary the "phasing" of the
long as the back blocks. This model was designated the 30J-18. 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. FM Transmitters: Energy-Onix Legend 3000, Solied-state 3 kW, single-phase, with exciter, frequency-agile: $5500 Energy-Onix ECO-6, 6 kW, 3-phase, one-tube unit. horizontal version which is the same plate choke
into the circuit. me by telephone from NU6AM. The transmitter weights just over 100 lbs in the
The 32V-2 is subject to mica capacitor failure due to the upgrade that
* From the bottom
6.3vac, 115 watts
turned out to be the DowKey relay was "chattering" and that had the arm
In addition to the TV signal strength problem, many early television circuits used a 21mhz IF
Remove the two "C"
The dial was not replaced since repro
installed two ways. * unsolder two wires going to two ceramic feed thrus at
seconds I was never concerned about it. The next step was to
on 10M (the callsigns weren't on QRZ) - I don't operate that band
You can also order "on
The multiplier was fairly close on 80M and 40M but not very
antenna impedance. transmitter, my hand happened to bump into the slide rule dial "glass" and it
NOTE: The 32V-1 wasn't affected by this problem because the
There was a
still connected to the rear terminals and the receiver standby wires
55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN:
frosted-side of the plexiglass and the glass dial. The HV
imparted enough vibration to the 5R4G tubes that their envelopes were
mechanical alignment as the panel is tightened to make sure there's no
the removable sheet metal cover over the multiplier section. store-chain that has shops almost everywhere. capacitors. be removed. 2. 2 - 807 - Modulators
Huge sales of TV
Most
Use an oscilloscope to monitor modulation
correctly. the right show the 32V-1 dial after the rebuild. An obvious improvement is the rebuilt slide rule MC dial
Broadcast Transmitters Catalog 12/1936 pdf: Broadcast Equipment Catalog 1964: parts: 1-3 2-3 3-3 General Catalog 1957: parts: 1-3 2-3 3-3 price list Speech . Dave Hultsman recalls that "Collins first I checked 80M, 40M and 20M and found the
voltage winding of T301 was wired correctly (+240vdc under load for
to fall out of their holes. Be sure to have the
removed and it can't "fall out." transmitter. The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. "A" terminal.
Listening to WWV at the source: Fort Collins, Colorado, USA front panel involves a special procedure due to the special flex coupling to the
buzz (actually the second one I tested.) only"
reconditioned, tinned and then soldered in place. improvements to the power supply and voltage regulation were
their positioning. Bulletin #1. what showed on the 'scope and was heard by the receiving stations on the
fans were located great distances from the nearest TV broadcast
front panel, no grab handles. single C303, frame T301 and L303 and no PTO screen
frequency readout to monitor the PTO output frequency. I did check to make sure the coupler set
the LV power transformer. stage. transmitter AC input. The second looked good and worked quite well. Modulator However, the safest approach is to set the LOADING to its
Also,
Full shielding of the PA and
your 32V shows just a slight tan color in just one location and maybe
reverse the secondary wires if you get an increase instead of the
Tear-down procedure. When planning rework, note that the 70E-8A used
were mounted on
The materials used were the
with the PTT function so, when pin 2 isn't grounded, the voltage will be
telegraph key being plugged in, the transmitter was always "key down." 25mA - the modulator idling current will have to be readjusted to 55mA
At that time, I didn't use a telegraph key to tune
following are some "key-down" voltage comparisons: 122vac input
thoroughly tested for the same reasons. The color
2002 - A new book on the life of Arthur Collins is now available. the index markings of the scale. Collins. The resulting stability was excellent and the frequency readout was Collins-accurate. intermittent on +LV, so all switches and controls were cleaned with
Clearance Center. which reduces the voltage on pin 2 to about +100vdc. was the broken retaining clip for the upper chrome strip. * remove both pilot lights,at this point the wiring
carefully cleaned with a dry soft flannel cloth no damage to the
assumed that most hams didn't have the proper tools to
transmitters with a Collins logo for a few years, before building the 830 series the 20V-3. dismounted or mounted. version V-1, Steve added the two 0A2 Screen Voltage
transmitter is at full output power. end-point error of the PTO. of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to
originally came with a red paper-string tag attached to the COARSE ANT
reducing TVI complaints. The vellum
The dial fiducial mechanism doesn't have to be dismounted. square potted housings late in V-2 production. Close
and Multiplier chassis. Procedure with Two Slight Variations - Remove all knobs
the front panel but if the dial is set to 4.0mc when the
26.5mc to 32mc. You can mark
Tube
aligns with each shaft when the pto/dial assembly
* loosen the two upper ceramic coupler at the front,
warped and distorted severely, which is typical for original dial assemblies. variable C for loading. It's
the PTT, along with other connections to allow the interfacing of the
Steve sent me his complete, "step-by-step" procedure
were excellent. is either a microwave signal from a satellite or a super-strong signal from a cable provider. capacitors in series for each capacitor required. causing saturation of the PA tube. quickly returns back to the set frequency in just a couple of
2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen
This had me motivated to correct
The transmitter line was later sold to Continental Electronics, which continued to produce a number of Collins designs under its own nameplate before phasing them out in . are the only
key is not installed in the key jack. is bolted to the front panel. The Phone mode used a 6SL7 dual
At the time of design, 15 meters wasn't an
Rework
couple of masking tape strips where T301 is resting on the chassis
broadcasting is HDTV on much higher frequencies nowadays and most
I
Sometimes trying to load high SWR, high reactance antenna
But, almost always the white
accessible ham band although it was designated to become one (in
(See also the CONTINENTAL While it worked on 80M
1 - 6AK6 - Multiplier - Buffer Amplifier
LOADING that actually saves the Pi-network from damage and it still puts
51K-1. examination revealed an all original, extremely nice condition
This 32V-2 has
L404 and the 10M tap
very easy to use, works really well and eliminates the
lot of users that tried to "load up" just about any piece of wire they
to the circuit design,it was the most advanced medium power ham
Shown to the right are all of the pieces to assemble the dial. 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
This is the most
coil-slug rack carriers in the frequency multiplier section and full permeability tuning
T301 had to be harvested from the very late version 32V-2 parts set
and 500 kW. In the old days of "leaving the xmtr on - all
Collins 300J and the 550. driving a send-receive relay, remote standby for the station receiver,
a right-angle bend so when the two pieces are together they form a
illumination. Another strange occurrence that really wasn't a problem, just kind of
Lifting the lid opened the "interlock safety switch" that turned
capacitors for the Pi-network. Don't change the original set up to
using the PTT, the carrier frequency will slightly drop a few hz
the modulation transformer provided 60 watts of audio available to
each side, remove these 8 screws
the 32V Series transmitters on the modern elevated AC line voltages many
V-3, any checking, adjusting, minor maintenance like tube testing, all
has to be individually cleaned with Glass Plus to assure good
* remove 4 screws holding mod chassis to power supply
dial area turning brown with a white area where the fiducial covered the
December - Collins Autotune receiver for civilian aircraft.
time-consuming "trial and error" approach to reducing the
except the spring tension of the clips and the front panel being mounted. signal quality and mostly reliable operation. provide a more durable and higher-Q Pi-L network that reduced the
while the 32V-3 has two "stacks" of three each capacitors. The problem was a blown fixed value
FINAL PLATE current. But, what about performance? Get a Quote.
Antique Radio Forums View topic - Calling all AM Broadcast Transmitters inside the power supply module
In addition, several
change for the 32V-2 transmitter was the redesigned
time. Tuning up in the PH mode and in PA OPERATE can
70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV
Manufacturers
In 1977, Collins Radio Co. was bought by Rockwell and moved to With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. reduced the ANT COARSE LOADING to 1 to start off. The
your line is about 122vac, for instance.) transformer for the PTO tube filament. connections. upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance
Radio Boulevard
phillips socket might be needed. plastic backing of the slide rule dial will be warped causing
That is probably why Bernie [Wise] FREE Collins 820D-2 1kw AM transmitter : Page 1 of 1 [ 10 posts ] Previous topic | Next topic : Author Message; HadYourPhil Post subject: FREE Collins 820D-2 1kw AM transmitter. Quick Glance
both styles) are mounted on a terminal board that is mounted to and
It
settings for each band with the 32V-2 operating into a dummy load. increasing TVI problem. to "unplug" many of the chassis and dismount them for really serious rework. vacuum tube rectifiers with SS replacements. I rebuilt the entire slide rule MC dial assembly with new velum, new
Rockwell Collins - Alchetron, The Free Social Encyclopedia The rear terminal strip had connections for
32V-1 didn't have a "TUNE" position switch to allow low-power
stand and the bug looks like a Vibroplex Original. The plate choke went from
wire) connecting the LV fuse to the AC line input. toggle switches on front panel, two pilot lamps (green and red) on
(within the first ~500 transmitters built.). Series will give you plenty of opportunities for lots of enjoyment.
Buy and Sell - The Broadcasters Desktop Resource This coupler
Unbelievably, the two 5R4G rectifier tube envelopes were barely
I'm still missing the two rear terminal
Series of transmitters aren't for you. chassis is installed into the waiting cabinet. the 32V-1 looks like a Call Book. Under the Collins label also came some of the most popular consoles and cart machines used by radio stations. then the wires unsoldered with identifying tape installed as each
The "B" version has "floating" tube heaters
advanced designs, dead-on frequency readout accuracy and great
former owner was trying to alleviate TVI issues. and rapidly drift back up to the set frequency (kind of like a "bloop.") The advanced design of the 821A-1 250 kw transmitter is a direct benefit from Collins' depth of experience in broadcast equipment manufacture and also the Company's broad diversification in other fields. together. modulation level. rectangle that will hold the remaining pieces. I
Mod tubes. backside. front panel, power supply, PTO/dial, modulator and RF
Everyone was trying to receive TV broadcasts "out of the air" via their
Posted: over a month ago. easily corrected. The +LV used a 5Z4 rectifier and
Ham Radio Classified Ads - QTH.com when putting transmitter bottom down for the following
the plate choke. while
10M. LOADING controls. plexiglass square rods are behind the vellum. The
+715vdc, +LV
This lamp is a 120VAC 4W to 6W incandescent bulb. rack,it pulls apart as the panel is removed but needs
and the Collins "Winged Emblem." component layout of the design. "touching-up" the ANT LOADING control and then not paying attention
transmitter lid to adjust the COARSE ANT LOADING. Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model
plating. contacts.) hadn't noticed for some reason. >>>. November - The new Collins 21A 5kw Broadcast transmitter. The +100vdc is derived from +LV through a divider
loading with one rotational
two 0A2 regulator tubes weren't flanking the 5R4 rectifiers
units. frosted. seems occasionally to be balky and slow. modulation level is not so high that "cut off" is happening. Collins 207B in the transmitting room aboard the USCG Courier. Dallas, TX, as Rockwell-Collins. in the early 1960s. dummy load was connected and the 32V-1 powered up. The majority of the transmitter circuitry wasn't changed,
in the front protects the dial nomenclature and also provides an even
often encountered version of the 32V Series. bicycle bell ringing. the transmitter setting right-side-up on the bench. Fortunately, I do have a 32V "parts set" that can donate
an 829B tube for the 4D32. interesting variation, although certainly an
32V-2 transmitter shown in this write-up since 1993, about 27 years. of the dial will help get these two standoffs in position. Then I attached the AC power cable and powered up the 32V-3. all remounted back in place. The only way to disassembly these transmitters
After the rebuild and with the assembly reinstalled into the
often as the 32V-2, which is the most often found model of the 32V
became the only accepted method to transfer RF energy from the rig
layout of the individual chassis that make up complete transmitter. flat-spring and wooden dowel held the rightside dial lamp power
A 600Z ohm tap on
were also still connected. the auxiliary relay is from the +LV supply through a divider network
September - A deservedly popular 50 watter. The range was 3000 km with the two-tube receiver. fixing, adjusting, reassembling and aligning of vintage gear, the 32V
cable that has an N-connector installed. Steve uses two 2x2s that are 12"
inconvenience of having to access the COARSE ANT LOADING
The dial rebuilding procedure
The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. I have estimated a year or decade. socket set screws.) explosively. bands are illuminated evenly at the same level of brilliance. index relationship to the ANT LOADING index scale and then to the
I called the owner who lived in Pahrump,
+LV.) Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00
new #328 lamps are "loaded" into their respective silver-plated
a 2 element mono-band Quad antenna. * remove both lamp contact blocks, these are held in
engage.
Collins 20v-2 Am Broadcast Transmitter on 75m Ve3ngw Florida located by the Pi-L network (on top of the
are tight they tend to make the chassis vibration resonate more in the
32V-3 would be able to function in "TV-land" without causing
SN:1507 (photo above-right.) can be relatively small. >>> Another oddity is the lack of a "TUNE" mode for the 32V-1
which requires the user, when tuning the transmitter - especially into
two years. This coupler has to be
or 40M (or both) operation. Now that newest of the 32V Series examples are over
. I checked phone
for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter
Additionally, the 21mhz video IF was harmonically related to the 40 meter
clip-in lamp fiberboard connectors. for fundamental overload problems.) them set for a couple of days to let the paint cure. Also visible is the PA
Were the 32V Series
resonance ("dip the plate") and from there, the COARSE ANT LOADING
Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. It's very easy to "over-modulate" the carrier. plate voltage is caused by L-303 and also that the HV power supply
If you're
there is a "snap-in" ceramic coupler between the VFO
lost their value and were then used on 11 meters by illegal
thoroughly clean, repaint and restore. key down. transmitter, the "band-in-use" MC dial illumination is bright and the dial
Collins Radio 20V2 Broadcast Transmitter Instruction Book - eBay side. I
ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. "next best" mainly because it's the initial version with all of the
flex coupler will be obvious when doing the
the front of the dial assembly. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will
With totally new and unique design features, this high frequency transmitter advances present day techniques of super-power transmitter design. At least
Photo to the
The tune position helped protect the Pi-L network fixed-value capacitors
with Derelicts - A Deplorable 32V-1, Replacement Rubber Bumpers for Collins Cabinets, Two
Pi-L network components were designed for. Citizen's Band operators (illegal because the FCC regulations limited maximum
seem to agree that the Collins 32V Series are excellent performers with
Moving a hundred pound rig does take a bit of caution. four mounting screws at this time, just snug is okay. Perhaps the Crown Jewel of the prewar Collins transmitters, the elegant 30J was the last amateur transmitter produced before Collins restructured for the war effort. kilocycle dial had a very slight discoloration that was barely
thin plastic can be found at any hobby store or any "arts and crafts"
The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. 32V
Steve did a complete
Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. the 32V-3 from Ham & Hi Fi in Sparks, Nevada.
Alex Murdaugh convicted of murder in shootings of wife, son - There were a large number of changes incorporated into the 32V-3 and
Nowadays, most 32Vs are only powered up for short intervals for
The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. However, the original types of
Some
It turned out that the dial assembly had been worked on in the past
cap in the Pi-L network. Each of the plexiglass square rods
From the time that the 32V transmitters were first
- not like it had never been cleaned but certainly dirty enough to
This necessitates having the transmitter on its
The QSL indicates his antenna was a "LONG WIRE." LV filters had been mounted. heat build-up and the operation remained quiet. in an effort to clean the chassis as this will probably just
I checked the LV rectifier tube socket, pin 4
out a decent quality signal. required, it might be necessary to adjust the two harmonic-spur C
The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. is further down this page. Others are more difficult, like the
4. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. note the position of the ANT LOADING and FINAL TUNING air
Removal of the chassis from the cabinet
Use
will remove most dust-film. advanced one switch position with each complete rotation of the ANT LOADING control. However, the PTO
1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier
Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor