开云体育

I was wrong. Copper ranks better. [email protected]> wrote:

Perhaps Aluminum has a better thermal conductivity than copper. Sarma vu3zmv

Better than mine, the SMA is a much better connector than the SO239 I used. I suppose if we had the base of the enclosures made from a piece of copper then the heat would spread much more easily and

This is my attempt.? Different design due to different scrap material in the garage and SMA scavenged from some unidentified thing from the club junk box.? 100W element.? Dimensions are 35x35x15mm.

Information my load R50 -?#1561 ------------------------------------------------------------------------------------------------

I like that Igor, that's nice ! You'll have to show us a smith plot. Having a lathe must be extremely handy/useful for all sorts of work. I've used my 50W load element (with the heat sink arrangement

For my load, I used a R50 @ 250W resistor. Some time in the lathe and I was able to have a good charge for my use. 73!

After calibrating the VNA with the usual 50R SMA dummy load in place of the big one, this is what I get. The dummy load SO239 definitely needs to be an N-Type socket.

Even better without the short coax. Need to replace the S0239 socket with an N-Type and use a straight SMA to N-Type to the dummy load to improve it I think. This is from 10kHz to 900MHz, considering

Better than 30dB up to 100MHz is not too bad considering that it is a transmission line sandwiched between ground planes and air dielectric.

The SO239 socket really needs to be an N-Type socket. The PCB track from socket to 50R element should be 50R (3mm track on 1.6mm FG) so that ought to be OK but the measurement just done (as below)

Very neat.? I think I have some scrap aluminium in the garage that has been waiting around 10 years to become useful, and there is a similar 50R in the component box.? A nice project for the

That is a very nice construction. Do you have a RL measurement for it?

Here's one we did earlier (50W 50R load element) ..

Dave, The commercial tinySA has a correction table for the RSSI of each of the 57 possible RBW -- HBTE Files section: /g/HBTE/files Erik, PD0EK

Observing a few odd things and following on from the post in the tinySA group where the 2.6kHz filter was removed I added a test mode to my ESP32 version to test the FIR filters, I called it RX Sweep,

Thats a winner... Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton - J68HZ

Glen, Thanks for the reply.? Considering the cost difference between the Rigol and the simpleSA, I think your hardware build is well worth the effort.? I am especially impressed by how smooth and

Here's a plot a 20M BPF I had in my junque box.?? Comparing "simpleSA" with a Rigole SA-TG. Same span (15MHz.) The simple SA is not quite as good, but its pretty close for a cheap instrument. EDIT:-

What kind of dynamic range are you seeing with the tracking generator add-on module?? One of the advantages of using the HP856x series spectrum analyzers with a HP8444 tracking generator was the LO