Re: [Amps] Looking for Alpha 87A expertise

[Jim <jimw7ry@gmail.com>]

Anything under 2ms  (2 milliseconds = 2000 microseconds, which is a 
whole bunch of nano seconds) is WAY MORE then enough for most 
transceivers. (Which was the point I was trying to make here).
BUT if you use an IC7000 or similar, you'll have trouble. But I think 
Alpha compensates for crappy radios that still transmit RF AFTER the PTT 
line is released.
See here:

https://www.w0qe.com/amplifier_timing.html


Thanks
73
Jim W7RY

On 3/15/2021 5:49 AM, Victor Rosenthal wrote:
> There is a high-speed version of the 1N4007, the UF4007 whose recovery 
> time is specified as 75 ns. That's pretty fast! See
> <https://www.vishay.com/docs/88755/uf4001.pdf>
>
> The regular 1N4007 is more like 30 us. Still fast.
>
> <https://global.oup.com/us/companion.websites/fdscontent/uscompanion/us/pdf/microcircuits/students/diode/1n4004-general.pdf> 
>
> 73,
> Victor, 4X6GP
> Rehovot, Israel
> CWops #5
> Formerly K2VCO
> https://www.qsl.net/k2vco/
>
> On 15/03/2021 4:57, Benjamin Deovlet via Amps wrote:
> > I respectfully suggest that you do a google search for the
> > specifications sheets for both diodes and do a comparison. Ben, W6FDU
> > In a message dated 3/14/2021 7:53:08 PM Pacific Standard Time,
> > ka4inm@gmail.com writes: On 3/14/2021 10:16 PM, Jim wrote:
> >
> > > Doug ...
> > > How fast is a PIN diode?  How fast is a 1N4007 in an Alpha 87? If
> > > you have not measured their speed, how can you make that
> > > statement?
> > It is my understanding that the 1N4007 (only) IS a PIN diode and I
> > have used them to replace PIN diodes in relay-less 2 meter
> > transceivers up to 35. Watts and normal operation and power were
> > restored. Without failing.
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps