[Amps] Looking for Alpha 87A expertise

[Jim]

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 at 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.
>>
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