On 2021-05-17 09:13, Don, ND6T via groups.io wrote:
Jerry,
I don't believe that the 4410a is a peak-reading instrument.
No, it isn't. I agonized over the choice. A simple 43 can be modified
with a peak-reading circuit. But you have to buy elements for every
power level.
The 4410a with a single 10kw element does 10W, 30W, 100W, 300W, 1000W, 3000W, 10Kw.
I've started prototyping up a peak-hold circuit for my Heath HM-102.
I figured that a string of dahs would be pretty close. But yeah,
straight key mode would be better.
For the oscilloscope, I would Tee off with a BNC Tee. I have a lot of those,
because of an old Ethernet called "Thin-net". Scope set to high-impedance, a separate
dummy load. For higher power levels, I'd use my 30-db Narda attenuator. Many scopes
have a built-in 50-ohm load, but its power capacity is limited.
The scope would be a Rigol 1054z with the 100MHz option. If I had to, I could
drag my 4-trace Tektronix out of the shed - I seem to remember it's a 150Mhz beast.
I spent 3 years working in instrument maintenance & repair, back around 1980.
- Jerry KF6VB
