TransmiTTer FM / TV

The Veronica 1W PLL

2008-03-14T08:03:00.000-07:00

The Veronica 1W PLL first marketed in 1996 is still the favorite choice for broadcast engineers at all levels from the hobbyist through to the professional licensed operator. In early 1998 the PLL 2 was released and then in January 2000 the latest version was released, the PLL 3 'Easy-Tune™'.

Frequency : (87.5-108MHz) User Programmable
RF Power Output : Typ 1000mW into 50 Ohm load
Spurious Emissions : Better than -40 dB ref to carrier
Frequency Stability : PLL Typ +/- 500 Hz
RF Output Connector : SO239
Audio Input Sensitivity : 0.775 V rms for +/- 75 KHz
Signal To Noise Ratio : 80 dBu
Frequency Response : Flat from 30 Hz to 76 KHz
Pre-emphasis : (50uS/ 75uS/ None) Selectable
Audio Distortion : Better than 0.2 % THD
Audio Input Connector : Phono/ RCA type unbalanced sockets
Power Input : 13.8V DC Regulated 750mA

LM317 TRANSMITTER

2008-03-09T05:52:00.000-07:00

The circuit is given above and needs very little explanation. It operates from a 10 volt supply and regulates to about 4.5 volts. This is used to excite the tuned circuit VC1/L1. The tapping is about 3% of the total number of turns of L1. A 6% L1 tap is coupled to the control input if the LM317T regulator chip and BINGO - It "hoots". You can draw WATTS of power from a 12% tapping of L1.

5-Watt Transmitter

2008-03-09T05:49:00.000-07:00

This is a very simple 5 watt CW TX based upon a TTL logic chip. There is just one "tricky" component and this is Cx. This component should have an impedance of about 10 - 50 ohms at the frequency of interest. If you wish to reduce the transmitter power, increase the value of Cx. It is Cx which causes the square wave from the output transistor to approximate a sine waveform.

1.8 MHz = 4.7nf
3.5 MHz = 2.2nf
7.0 MHz = 1.2nf
10 MHz = 820pf
14 MHz = 560pf
18 MHz = 470pf
24 MHz = 390pf
28 MHz = 330pf

the AM1000

2008-03-09T05:46:00.000-07:00

The features of the AM1000 are too numerous to fully cover:

The Legality! Rest assured that you can operate under the law, and if there is a issue we will be there to help.
RangeMaster digital link! Only RangeMaster has this RS485 carrier interface. This link allows great flexibility in designing your multiple transmitter system. With this link it is possible to synchronize RF carriers between transmitters.
GPS controlled sync capability for multiple transmitters! (RF carrier, not the audio)

The AM1000 is FCC certified and legal! When properly installed the AM1000 is legal to operate. Avoid problems with the Federal officials and the embarrassment and potential for fines of being found to be operating a pirate or illegal radio station. When the Federal agent comes calling instead of fear and dread and having your station shut down you can pass inspection! If you are thinking of buying and operating an uncertified kit or product be aware that may be illegal.

E AM Transmitter

2008-03-09T05:39:00.000-07:00

Class E transmitters are high efficiency, reliable, solid-state transmitters. They are simpler to build than similar transmitters using vacuum tubes, and are significantly less expensive to both build and to operate. Class E is a switching mode of operation, and exhibits extremely linear modulation characteristics, making these amplifiers well suited for high quality, amplitude modulation. They are also very well suited for amplification of frequency modulation or other modes where linear amplification is not a requirement.

1.5 Volt Tracking Transmitter

2008-03-09T05:35:00.000-07:00

4 Watt FM Transmitter

2008-03-09T05:21:00.000-07:00

Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic.

Parts List

R1 = 220K
R2 = 4,7K
R3 = R4 = 10K
R5 = 82 Ohm
R = 150Ohm 1/2W x2 *
VR1 = 22K trimmer

C1 = C2 = 4,7uF 25V electrolytic
C3 = C13 = 4,7nF ceramic
C4 = C14 = 1nF ceramic
C5 = C6 = 470pF ceramic
C7 = 11pF ceramic
C8 = 3-10pF trimmer
C9 = C12 = 7-35pF trimmer
C10 = C11 = 10-60pF trimmer
C15 = 4-20pF trimmer
C16 = 22nF ceramic *

L1 = 4 turns of silver coated wire at 5,5mm diameter
L2 = 6 turns of silver coated wire at 5,5mm diameter
L3 = 3 turns of silver coated wire at 5,5mm diameter
L4 = printed on PCB
L5 = 5 turns of silver coated wire at 7,5mm diameter

RFC1=RFC2=RFC3= VK200 RFC tsok

TR1 = TR2 = 2N2219 NPN
TR3 = 2N3553 NPN
TR4 = BC547/BC548 NPN
D1 = 1N4148 diode *
MIC = crystalic microphone

Note: Parts marked with * are used for the tune-up of the transmitter in case you have not a stationary wave bridge.

Illuminated FM Antenna Booster

2008-03-09T05:09:00.000-07:00

Improves FM reception for cars, boats, trucks, and RVs. Reduces fading. Improves sound clarity of remote stations. Does not interfere with AM reception. Fully illuminated. 12 VDC operation with power switch. Mounting hardware included.

Radio and Television DX

2008-03-09T04:45:00.000-07:00

Short History:
My hobby is FM and TV DXing, receiving distant radio and TV signals. I started this in 1984, and a member of the Benulux dx club bdxc
before that had operated an illegal (FM) radio transmitter for five years. In 1989 I installed a dish for receiving satellite transmissions.In the autumn of 1997 I bought a computer, discovered the Internet, and since then have enjoyed developing my own homepage.

Television standards:
Recently a lot has been accomplished to facilitate easy reception of foreigen broadcasts by simplifying television standards. The discontinuation of the high-difinition French 819 lines standard and the rather poor British 405 lines standard left the world with just 2 standards; 525 lines. (generally accompanied by the American NTSC colour system) and 625 lines (usually in PAL or SECAM colour). The technical characteristics of the various transmission systems are given in the tables below. The colour standards (PAL, SECAM, NTSC) and television
system used by each country are indicated at the top of the country entry. Antenna polarization varies from one transmitter to another and either (H)orizontal or (V)ertical.

TV Transmitters / Amplifiers

2008-03-08T21:57:00.000-08:00

Analog and digital UHF and VHF transmitters and amplifiers that use solid state and plug-in technology.

From 5w to 20kw

Both air and Liquid cooled transmitters are available.

SkeMa FM

2008-03-08T21:56:00.000-08:00

PA 1971 Data Book
PA 1972 Data Book
PA 1946A Data Book
PA 2630 Data Book
PA 2782 Data Book
PA 3CX800A7 Datasheets
Antene FM Broadband1
Antene FM Broadband2
Antene FM Broadband3
Antene FM Broadband4
Antene FM Broadband5
Bosster 2SC2694
FM Stereo BA1404
Layout2SC1946A
Layout2SC1971
LayoutMRF240

Skema example

2008-03-08T21:52:00.000-08:00

OLPC XO Laptop Computer

2008-03-08T18:27:00.000-08:00

View DCMetblogger's map

Taken in a place with no name (See more photos here)

The One Laptop Machine XO $100 laptop

Apple Laptops

2008-03-08T18:06:00.000-08:00

Apple iBook G4 Laptops

IBooks are available in 12-inch and 14-inch sizes and are great laptops for anyone on the move as they're light and their battery times are among the longest I've seen. Not only are they compact but Apple has managed to get a lot of power in there so they're definitely worth looking at.