QRO HF-2000 HF Amp – 1.5KW

This is a pity, because “switchers”, as they are often called, offer very attractive features, like small size, low weight, high efficiency, and low heating. True, they are generally more complicated than linear power supplies, but this is easily compensated by the fact that they can be built for a lower cost. Some early switchers produced an objectionable amount of RF noise, bringing the whole switching technology into bad reputation. But by proper design techniques and careful EMI filtering it is possible to build very quiet switchers. In this article I will describe the construction of a switching power supply designed to power a complete ham station, with several radios and accessories. This power supply produces It has current limiting, making it appropriate for direct connection to a 12V backup battery. If the current limit potentiometer is turned up, the power supply can deliver up to 60A on an intermittent basis, while maintaining regulation.

13.8V, 40A Switching Power Supply

Turn the coiled wire off the bolt as if you’re unthreading a nut, and clip each lead to about 1cm. Bend little “feet” on the ends of the leads and adjust them so the coil will stand upright. Holding a pair of pliers in each hand, grab the coil’s leads and stretch it evenly along its length until the feet are 12mm apart on center. You may need to even out the coil spacing with a screwdriver or other tool. This will be your ground plane.

An FM (frequency modulation) antenna connected to a stereo system can help a receiver pull in better signals from FM radio stations. Stereo receivers typically have a pair of FM antenna .

They are quite rare and very hard to find in such pristine condition. It still has the original patina, dark brown and copper just like the factory produced them. So many of these radios have had the patina polished away, missing the reins or the saddle. Blake has replaced all of the paper capacitors, tested and replaced bad resistors and checked all of the tubes. He performed a proper alignment, making this little five-tube, AM only radio play like new.

A very cool gift for that horse lover, or man cave. Here is another one of a kind radio design! This Abbotwares “Horse with Saddle” is seldom seen, and when found is usually missing its saddle. It came from the estate of a Doctor in Auburn, Maine, who collected only the best of each radio. This is easily the best I’ve seen.

Crestron AM/FM/TV Tuner Operating Manual

A Thomas Sams Photofact publication, first edition, first printing This book explains the uses of Lasers and Masers and their applications. Masers in their fundamental action are completely different then vacuum tubes or transistors, while electronics abound with many new techniques and applications, most of these are modifications of pre-existing knowledge and do not represent revolutionary ideas.

The Maser is an entirely new concept. Noise-Free amplifiers and ultra-stable signal sources are just two Maser applications.

Find great deals on eBay for Stereo Receiver FM Antenna in Antennas and Dishes. Shop with confidence. Find great deals on eBay for Stereo Receiver FM Antenna in Antennas and Dishes. Attaches to the back of your FM receiver or tuner. Enhances FM stereo reception. CONNECTS TO FM TUNERS/RECEIVERS. 5-ft center lead with 6-ft span. Get your.

Now I can build a stereo system! Reply Mr D March 13, at 6: Now this old hippie can rock n roll all night long and party everyday! D Reply William B. Feemster July 9, at 8: I have a floor model stereo from the that my brother gave to me. I want to replace everything on it. The floor model cabinet is still beautiful!

Nick Bock July 16, at 1: Yes, this article needs to show how to hook up a turntable to a stereo system. I plan to update this in the next few weeks with more instructions and pictures for adding equipment like a turntable. And I agree, those stereo cabinets look beautiful!

FM Receiver Antennas

Dipoles work OK when the signal is adequate, but when multipath is stronger than the direct signal AND the tuner has inadequate alternate channel selectivity, it’s time to forget about clear reception and that’s what I have here- as I wrote, I’m very close to an antenna farm and that’s not good for someone who likes to listen to a college station that’s weaker than all of the others.

Here’s a photo of the kind I’m referring to. It’s possible that some are two wires, but many aren’t and I have seen several that had been cut. There are lots of good vintage FM tuners on eBay.

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Permission is hereby granted to quote our text so long as proper credit is given. Jim and Bob’s DIY Mods For those interested in modifying tuner audio sections, this page offers a few general suggestions, followed by specific information relating to many Kenwoods and several other vintage tuners. Return ground path – On the Kenwood KT , there is a way to help ensure the integrity of the return ground path.

There are four screws that clamp the circuit board to the steel frame, which holds the power transformer and more. Loose screws can cause electrical problems in the KT and other tuners. First, remove the screws and inspect the board and frame for corrosion or dirt. Second, clean the interface with Caig DeoxIT or another commercial electrical contact cleaner. When reinstalling the screws, don’t re-tighten them so much as to crack the circuit board – just good and firm.

Power supply – Raise the transformer off the chassis with rubber grommets. Measure AC on chassis to outlet gnd with plug oriented both ways, mark plug for lowest noise. New “low noise” diodes, with snubber circuits, bigger better electrolytic caps with smaller bypass caps.

How to Hook Up Cable to Receiver for FM Radio

Permission is hereby granted to quote our text so long as proper credit is given. Jim and Bob’s DIY Mods For those interested in modifying tuner audio sections, this page offers a few general suggestions, followed by specific information relating to many Kenwoods and several other vintage tuners. Return ground path – On the Kenwood KT , there is a way to help ensure the integrity of the return ground path.

There are four screws that clamp the circuit board to the steel frame, which holds the power transformer and more. Loose screws can cause electrical problems in the KT and other tuners. First, remove the screws and inspect the board and frame for corrosion or dirt.

Jul 29,  · Q: I need an indoor AM/FM antenna for my 30 year-old Technics receiver. It works well enough for the most part, but I have trouble receiving radio on either band.

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Super Simple iPod FM Transmitter

You can use either an indoor or outdoor antenna, though the outdoor variety often provides better reception. Both types will connect and work in the same way. If you no longer use your antenna for TV, connect it directly to your radio, otherwise you’ll need to use a splitter. Some have a pair of screw terminals, and others use the same threaded F-connector used for cable TV.

Sep 13,  · How to Make an FM Antenna. In this Article: Using a Coaxial Cable Using Speaker Wire Community Q&A. Hook Up a TV Antenna. How to. Make a HDTV Antenna. How to. Design a Simple Antenna. How to. Fix a Radio Antenna. How to. Make a TV Antenna with a Potato. How to. Use Your Home Wiring as a TV or Radio : M.

One of the ohm teminals may also be marked 75 ohm, with a line or some sort of marking “linking” it to the ground terminal. The ordinary cheap “T” FM antenna would connect to the 2 terminals marked ohm. Your speaker wire might make do til you can scrounge or buy a “T” antenna. Just take a 6 foot length or so and separate one end of it so the two ends are ” apart when spread out to the shape of a “T”. Separate the opposite end a few inches, strip the ends and attach to the ohm terminals.

Try orienting the “T” in different directions for best signal. Should coaxial cable be involved Most amplified FM antennas have a coaxial cable with an “F” type connnector same as cable TV at the end. Some receivers have a “F” jack on the back for FM, so it’s just plug ‘n play. Otherwise, to eliminate the need to cut the connector off, strip the cable, etc.

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Untitled Document Tips for improving tuner signal reception: Radio signal quality can be influenced by several factors when operating a tuner inside of a building. If you are having trouble receiving FM radio transmissions, you can try some of the following steps:

May 09,  · The ordinary cheap “T” FM antenna would connect to the 2 terminals marked ohm. Your speaker wire might make do til you can scrounge or buy a “T” antenna. (they’re cheap.

TV antennas have compromises built in.. All of this it tied together and the efficiency is greatly compromised. Also, there is no elements cut for the 3-meter FM broadcast band. You must rely on the VHF-lo elements, which are designed for Mc. This has directional selectivity limitations: Because the wavelength of the signal is too small for the VHF-lo elements, the antenna’s front to back ratio it’s ability to select signals directly in front of it, but reject signals from behind is very poor to nonexistent.

TV antennas tend to have many lobes, scattered around the azimuth plane, looking sort of like a starfish pattern, at Mc. The behavie psuedo omni-directionally at these frequencies.

FM Tuner signal reception tips

FM Transmitters This tiny Mhz FM transmitter bug measures just 10mm x 17mm in size and as you can see in the photos the biggest components are just the microphone and the battery. You can use a small microphone from an older cell phones, they are small in size and have an excellent sensitivity. For an effective power supply the 9V battery Duracell is excellent and allows several hours of battery life, but if you want to have a smaller size it is better to use 2 or 3 lithium cells like the used in PCs.

Step. Attach the two wires on the other end of the transformer to the two terminals on the receiver labeled for an FM antenna. Either wire can be hooked up to either antenna terminal for this type of connection.

Share on Facebook If your cable TV provider supplies FM radio stations, you can pick up the signal through a cable connected to your home theater or stereo receiver. Some receivers are equipped with a coaxial input to connect with a cable. Other models have a pair of spring-clip connectors that hold the two wires for an FM antenna.

For a wire connection, you’ll need a device called a Balun transformer, which has two wire leads on one end and a coaxial jack on the other. A Balun transformer can also be used to connect a wire-lead receiver to a coaxial cable antenna for improved reception. Coaxial cable with threaded coupler on the end for the receiver connection. Step Turn off and unplug the receiver. Step Connect the coaxial cable directly to the receiver’s matching input jack or hook up the cable to the coaxial jack on one end of a Balun transformer.

Twist the metal fastener on the cable end clockwise around the jack. Video of the Day Step Attach the two wires on the other end of the transformer to the two terminals on the receiver labeled for an FM antenna. Either wire can be hooked up to either antenna terminal for this type of connection. Step Connect the other end of the cable to the output jack on the back of the cable box or to the jack on the base of your antenna.

Technics SA-946 receiver AM loop antenna from uxwbill