At the US legal limit, it's $2.25/Watt. It's also a tube amp while you show/compare it against the list of solid state amps. Cathy, the PW-1 is a 1000W amplifier per Icom's own Instruction Manual. Y
Several of the newer LDMOS designs are using *two* active devices rated at 1500W each. They are not nearly as stressed as older devices run into saturation and should provide significantly better IMD
And none of the new design amplifiers from Eastern Europe use the 8877 - they all appear to use Chinese tubes of uncertain pedigree or quality. 73, ... Joe, W4TV _____________________________________
on 11-15 vdc. Are they using loads of NFB ? Yes. Along with little to no compression and making sure that the IF stages aren't over driven. The ALC/IF circuits of amateur transceivers are responsible
The FCC has absolutely no specifications for IMD in amateur service. Unfortunately, ARRL refuses to "call out" transceiver and amplifier manufacturers who produce products with high levels of IMD (as
Only on 160 meters for 750 Watts output. By the time one gets to 27 MHz the optimum output impedance is down around 5 Ohms ... it would be a real trick to design a broadband output. The best approach
The current crop of new devices is likely to be around much longer than devices made just 10 years ago. Given the trend to pallet based amplifiers, I doubt the device shelf lifetime will be very lon
On the other hand, an air capacitor also arcs at a lower voltage at the higher altitude. When properly set to protect the capacitor at sea level, the gap will be the same at altitude since the break
700 Volts sounds awfully low. The Clipperton L used 4 x 572B tubes with a plate voltage (unloaded) of 2300-2400V in SSB and 1500-1600V in CW as was typical in the SSB/CW switching of the day. Perhap
That will give you average (RMS) voltage with SWR = 1:1. For peak voltage, multiply by 1.414 (peak voltage of a sine wave): 316 * 1.414 = 447 V. Your 1200V capacitor will do the job with adequate hea
As long as one has access to CAT data, one could use the microHAM Station Master (Band Decoder) which has a PA Port that can be configured to control either Yaesu style (BCD) or Icom Style (CI-V) amp
On 12/2/2017 10:12 AM, Peter Bertini wrote: Plate load for two is around 3500 ohms, so I'll be around 1750 or so with four of the beasts in parallel... Plate load is determined only by Plate voltage,
microHAM SMORF and N8LP LP-100A will provide calibrated R+/-jX for this application. SMORF will allow "calibrating out" a known distance of standard cables. Either unit has a remote sensor unit that
On 2019-09-15 4:40 PM, w9bs@w9bs.com wrote: I was running the OM4000a at 200-300w out (with around 3-4w of drive), and tuning it as normal to the "carrot" on the tuning indicator. Sounds like the "ca
"Legal limit" AM is 375 W of carrier -> 1500 W PEP. Whether the OM4000 can be tuned properly for that operating condition is another story. 73, ... Joe, W4TV Greg K1YW _______________________________
With cooling systems like the MOSFETs (tubes in a copper spreader) electrical conductivity isn't a problem. Unless your radiator is outside and the plumbing is exposed to freezing temperatures, strai
Unfortunately, this transformer lacks the primary taps for CW/SSB operation of the OEM device. 73, ... Joe, W4TV On 10/30/2019 8:56 AM, Joe wrote: Morning Dick, If you are not afraid of making a few
Some people prefer to keep their equipment "stock" or at least functionally stock. The SB-200 was never designed for 1500W output on CW - it was designed to operate at 1 KW DC input (ca. 700 W CW or
If you increase plate voltage alone, which results in a higher plate current with no signal applied, are you indeed changing the bias? Yes or no. No. You are changing the operating point (operating c
Question: How can you change the class of operation and conduction Because bias is not the only factor in class of operation/conduction conduction angle. Study the constant current curves for tubes (