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Ameritron al-1500 amplifier max watts am

Yet, this is an amateur radio antenna. The gray one on the left uses a 50v w device, and will produce sustained 1. Long, long story. You can get an Amazing offers when you purchase this item in Sale Today at Aliexpress. I can transmit - but I can't use my callsign!

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WATCH RELATED VIDEO: Ameritron AL-811H 800 Watt Amplifier Demo and Review

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Neutralizing H. Tuning Supplement. Skip down to schematic. The older ALH prior to drive resistor modification with good tubes and stable power line, when properly tuned and operating in the linear region , has about 11 dB gain. This is an amplification of about twelve times.

With 60 watts of drive power, output is watts. The power gain is slightly higher on SSB than on carrier or high average power modes, but the gain will be reasonably close on all bands. The largest single problem with significantly greater or less gain power output is a poorly calibrated power meter.

A mismatched antenna or load can falsely increase power readings. The following is typical measured gain of an early pre unmodified with good tubes at 7 MHz with carrier power. Gain is slightly higher on SSB or low duty cycle, because anode voltage is slightly higher. HV is volts at full load:. ALH, highest peak power, in sidebands with normal voice modulation at watts PEP with fresh tubes on worse band, ten meters.

Next channel up, strongest peak is about dB compared directly to voice channel median power level. Properly tuned with good tubes , the ALH adds negligible bandwidth to a typical radio's SSB signal, even on the worse-case band.

This performance can be improved with a TOF module. There is some history of the A tube at this link. Factually, the largest number of field failures are damage to anodes from excessive anode heating and low filament emission from poor tube manufacturing quality. Grid related failures are nearly non-existent. The most common cause of operational or customer induced tube failure is excessive anode dissipation over time. Heat is a function of duty cycle and short term average dissipation.

The second or longer time-period dissipation dissipation is not the same as output power must be kept below 60 watts. For short periods IVS service dissipation can be much higher. Anode voltage, within reasonable limits, has nothing to do with tube life or tube arcing. Virtually no tube failures relate to anode voltage. Anodes, which produce most of the heat, and the other heat sources are inside a sealed glass envelope in a vacuum.

There is very little heat conduction to the envelope. The vast majority of heat is removed via infrared radiation and radiated to tube surroundings.

The only thing the air does is cool the glass enough to prevent damage to seals or the glass envelope itself. External airflow does not measurably improve anode cooling, and anode temperature is the limiting parameter. See his link Keep in mind however the H does not "push" the tubes any "harder" than Collins did in the 30L1, or Heath did in the Warrior. It has been a long standing tradition to run tubes at about watts dc plate input, which is about watts RF on the anode, per tube.

This is why the Collins 30L1 was marketed as a "kilowatt" amplifier, which is over watts output carrier. The problem is not exceeding the watt dissipation for short periods, the problem is exceeding it with enough duty cycle to overheat the anode. The most common problem today by far, excluding operator error, is quality and design of tubes.

Please read about how the tube got better, and then worse, with design evolutions. Meter protection diode D16 is the unlabeled small black diode near C It protects the meters in the event of an arc. If D16 fails from an arc, the grid and plate current meters will track. The grid meter will no longer read grid current and the plate current meter will no longer read plate current. They each will read a combination of plate and grid currents. This diode can be replaced with any 1 to 5 amp silicon power rectifier diode that physically fits.

I designed the AL series amplifiers in the late 's or early 's. The original concept by marketing was a cheap, two-tube amplifier, but I convinced marketing that the life of two tubes would be far too short.

I talked them into a bare bones minimum three tube amp, and a slightly more refined four-tube amp. Amazingly, the H has become the largest selling amplifier in the world! This is largely due to the limited budget of most Hams, and the large power increase per dollar investment. I was also involved in several Heathkit designs, including a Warrior II that fell fate to Heathkit's exit from the amateur market.

I still have a few original prototypes of the Heathkit amplifiers. All of these amps, like the ALH, push the tubes pretty hard. Of the above amplifiers, the Collins 30L1 is actually the least stable design. Heathkit, Gonset, and Ameritron were wise enough to add neutralization but Collins did not. The result is that the Collins 30L1 was plagued with a series of stability mods throughout production, and even the final production units are not unconditionally stable.

The three tube AL, like the Collins 30L1, is not neutralized. Because the AL uses three tubes and directly grounds the grids, the AL with only three tubes and directly grounded grids has less feedback capacitance than the Collins and is not as unstable as the 30L1. The ALH, with neutralization and other necessary additions, is a much more stable and repeatable design. Nearly ALL tube failures are related to excessive dissipation by improper tuning or operating, or by simple tube manufacturing defects.

I have actually seen brand new tubes with fingerprints inside the envelope! Tube quality control is nothing like it was, but at least the tubes are inexpensive. The A tube has a rated dissipation of 65 watts. Please read the link to understand the complexity of dissipation ratings for various modes.

Because anode dissipation limits are greatly exceeded in normal IVS intermittent voice service and CW operation, as they historically have been in every amateur amplifier, the operator has to be very careful with tuning and duty cycle. While a few people are critical of the AL operation, every amplifier throughout history has pushed 's a similar amount. Ameritron actually pushes the tube no more than Collins or Heathkit did, both of whom allowed watts dc input on CW.

I recommend a TOF circuit to help monitor proper operation. This circuit gives a visual warning of excessive grid current or improper tuning. It eliminates the need to check grid current with a steady carrier, and gives a running warning of tuning and drive conditions that cause splatter. Amateur use is generally not commercial service, and this is why everyone from Collins to Gonset to Heath, and even ARRL Handbook articles, have pushed tubes.

The reasons the tubes can be pushed are low tube cost and, even when pushed, IMD splatter or distortion performance stays well within acceptable limits. The A tube is the transmitting tube equivalent of the "sweep tube" commonly used in the 60's. It is just a bit more rugged and significantly cleaner than a sweep tube. On voice emission tests, using peak power taken over long periods of swept peak storage, peak sideband voice IMD is around dB for third-order products with watts PEP output per tube.

If you can't quite get the hang of tuning, or you want to "hammer" the amplifier amplifier with long average-power modes or use a lot of processing on voice, tubes will be the weak point.

It is perfectly acceptable to replace the tubes with three or four B tubes in the AL or ALH respectively to increase duty cycle and tube reliability.

While you should NOT run more output, duty cycle can be greatly increased without hurting tube life. The single largest problem with the AL amps is tubes. Most tube failures, as mentioned above, are caused by poor tube manufacturing and operators who don't quite tune fast enough or well enough, or operators who use high duty cycle modes. The tube needs short tuning periods with at least equal time, or longer, to cool between carrier periods.

Remember it is the plate dissipation averaged over time periods of 15 seconds or longer that cause tube heating failure problems. When the tubes arc, the arc path is from anode to grid. If the grid resistor opens, the grid no longer provides a grounded barrier that shields the filament from anode voltage.

This can allow the filament to pull to a high voltage of volts or more. In the 90's, Ameritron added MOV's from the filament wires to ground near the filament choke bypasses. This helped protect the exciter and parts inside the AL My suggestion is the grid circuit be reworked to eliminate R and directly ground the grids with the shortest possible leads, and that gas clamp tubes of about volts or slightly less be added.

Link to AL mod. This mod is also similar to the AL mods at this page. If the grid and plate meter track and show similar deflection, D16 is often the cause. D16 is the metering protection diode, and it fails from tube arcs. If the amplifier shows anode current without being keyed but meters are normal, RL1B has welded. If the amplifier shows anode current without being keyed but the grid meter reads backwards, the most likely cause is a tube shorted from filament to grid.

Use WD40 carefully applied through a spray tube. Carefully and slowly flood the switch from the front panel side with a little WD40 while clicking the switch back and forth many times. This will wet the contact paste inside the switch and wipe the contacts clean. Note: If you tune the amplifier at reduced drive power, gain increases.


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T here comes a time in every hobby where we have to decide to either back out of it or get serious. I ran barefoot watts for twenty years, with the convenience of an auto-tuner and push-button tuning. But recently I realized it was time to move up and as they say, run with big dogs. We are currently in the low part of the year sunspot cycle, and most of the HF activity is on 75 meters — and 75 is a very noisy band, especially in the summer. I studied the situation for a few weeks, and finally settled on the Ameritron ALB amplifier. Everybody that has one loves it. But with the M you still have to add a 75 amp power supply, which is several hundred dollars more, and then you have a watt amp that cost almost as much as the B.

W7TDC modification of the Ameritron ALA power amplifier A solid state amplifier for HF and 6 meters band by N4IP; Watt Solid State HF Amplifier.

The AM Forum


Search Products:. Irf hf amplifier. Priced from. Keep in mind that the before , the FCC regulated hams according to input power, so when hams talk about a 1kW amplifier, they are referring to 1kW input, not Rating: Here is the outcome. Buy now. At the beginning of the amplification, a low pass filter blocks high-frequency noise. The first stage of the 50 watt Mosfet amplifier is a differential amplifier based on transistors Q1 and Q2.

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ameritron al-1500 amplifier max watts am

Recommended steps to tune this antenna design: 1 Put up the antenna with no L or C and resonate to 3. When I first moved here, I had a dipole at about ft, and it was "low. He promises to re-install the ZS6BKW dipole antenna similar to a G5RV antenna, but much better matching on the ham bands and restore good operation at the station. Computer Optimized G5RV design. ZL Special, details of which were published in.

Neutralizing H.

AL-811H - KO4AJE


David, aka Grumpy, needs our help. Great news. David is home! It was quite the ordeal to get him home and into the house, but it is done. Thank you to everyone for their support. Now a long road ahead to get him back on his feet and functioning normally.

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This kit will greatly increase the weight of the parcel. Pout: W. Performance on 6 meters is similar with 1. Design Information. Brand: Fetcus.

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Table Of Contents. Table of Contents. The power supply high voltage output can be reduced to increase the efficiency at lower. At 30 volts the ALS will deliver watts of output power.

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This is a great linear for the first time user. Easy to tune and plenty of RF power.

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Search Products:. Wilco's Referencing the esteemed turntables of the golden age of Hi-Fi, the GT expands on this heritage in the pursuit of pure musicality. If not, there are other free options. The protection circuit uses a tran- sistorized amplifier which controls a manually reset latching type relay. John and the crew have been testing the waters on these bands for years using an experimental license. The voltage gain of boosts the input signal up to the high voltages needed to drive our lithium niobate broadband modulators and shear piezo chips. Banner offers new and innovative technology in photoelectrics, laser distance measurement, ultrasonics, and fiber optics to solve almost any industrial automation application.

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If you cannot hear them, you cannot work them. So, before buying an amplifier, install the very best antenna system you can afford. The best example of a compromise antenna is a G5RV because it was designed to provide great results only on 20m — on every other band it is a compromise and on 80 it gives very poor results, on it is little better than a Dummy-Load. A good antenna system gives gain in two directions, receive and transmit.




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  1. Senior

    It's the shame!

  2. Sinon

    I'm finite, I apologize, but it doesn't quite come close to me.