Heybour transformers. 73 Jim W7RY $400 is a bargain these days! My last two xfmrs for two homebrew amps (4500VDC and 2700VDC) cost $900 each and weighed 67 lbs. 73, Jim W8ZR Sent from my iPhone 1 amp
Because it solves nothing. All amplifiers will be running at the same time in a multi-multi contest environment. 73 Jim W7RY Hi W7RY: Marv... Because this will be a single power supply and multiple R
25 kva transformer. 73 Jim W7RY -- ORIGINAL MESSAGE --(may be snipped) Because it solves nothing. All amplifiers will be running at the same time in a multi-multi contest environment. 73 Jim W7RY REP
Can we PLEASE include the text your responding to in future posts?? Thanks 73 Jim W7RY --Original Message-- From: Catherine James Sent: Thursday, December 08, 2016 6:09 AM To: Leigh Turner ; 'AMPS' C
Check the filament feed through caps. They are famous for being leaky to ground and shorting to ground. 73 Jim W7RY Group I have an L7 that was sent to me for repair and I am getting nowhere with it.
Better to put a diode here to protect the meters. See the link: http://www.w8ji.com/fault_protection.htm D2 in the last diagram. I put a spot for one on my SB220 replacement diode/metering board. 73
Glad you found it Paul! And I put the new "D2" diode in the power supply because that is where the caps are. 73 Merry Christmas Jim W7RY/0 The L7 amplifier with the negative grid current on standby h
SB220 filament winding is on a separate transformer. SB200 is the same transformer. 73, Merry Christmas. Jim W7RY/0 I suggest NO diodes or resistors in the LV side of the xfmr. A buck transformer in
That is not right. Here is a document that has the ANSI standards listed: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=19&ved=0ahUKEwj2gIyDwO3QAhUBViYKHQTcCJMQFgiBATAS&url=http%3A%2F
Jim... You must have missed this statement from W8JI's site... "The grid, being directly between the anode and cathode, shields the filament-cathode from the anode. Very little cathode fault current
In my opinion here's why the were against it; SDR technology and manufacturing of them is getting very simple and much less expensive. When you see an SDR receiver selling for a few hundred bucks, it
Are you against capitalism in general too Kim? 73 Jim W7RY --Original Message-- From: Kim Elmore Sent: Wednesday, December 28, 2016 8:12 AM To: Amps group Subject: Re: [Amps] FCC Denies Expert Linear
I see a variable capacitor in the wattmeter, the only adjustment. Is this a calibration adjustment? This is called the Null adjustment. Which you set for lowest reflected power with the amplifier int
Novice was, as it is now an introductory and non renewable license Technician was for VHF and above for those primarily communications. General, was a step up in speed and electronics theory and circ
Same thing that has happened to LOTS of brick and mortar stores. Gone out of business and/or cant compete with the internet and China on EBay. Remember in the 80's and 90s when Computer Shopper catal
Indeed! Well done! 73 Jim W7RY Hey! I make my own beer.....doesn't that count for something? 73 Chuck, W6AJW On 01/05/2017 05:42 PM, Steve Wright wrote: On 06/01/17 10:28, Catherine James <catherine.
I completely disagree! My first amplifier project was at age 16, shortly after I got my general class license. I modified (and extensively at that) a amplifier that was homebrewed by someone else. I
Glenn said.... "There are commercial two-way operations in the 220 MHz to 222 MHz segment using, primarily, ACSB. At least, for the 222 MHz to 225 MHz segment, the Amateur Radio Service is now "prima
The plates are unmeshed the higher the frequency. So 10 (both on the logging scale and also on the band) would be minimum capacitance (unmeshed). 73 Jim W7RY Hi I recently stripped my Collins 30L-1 f
8877 will do 2500 watts out CCS. Like in a Bext broadcast FM amplifier. 88-108 MHz. 73 Jim W7RY Jim brings up a good point that didn't cross my work addled mind last night. On 10m FM you aren't going