AD6XY wrote: > This is very interesting and useful. It looks a little bit like a Borland > app > but I expect it is not.
It is a VB6 application. I used the older VB technology to keep the program small and to avoid users having to download .Net updates which consume a lot of resources and can take 30 minutes or more to download even on a fast Internet connection. > The first time I tried the linearity check I had the volume up - loud > mistake! I hadn't thought about having the program turn the AF gain down for users. I can add that capability if it would be desirable. > It takes a very long time to sweep a filter this way, it may be better to > implement some form of variable sweep based say on the difference between > the last value. One tends to want detail in the passband but not so much > in > the stopband. I will look into this change. May want to make it optional for users to implement. Or I suppose the user could just set the frequency range narrower to focus on the passband portion of the response. > One thing we are missing is phase response (AM/PM), I would be interested > to > know if there is any way to measure this with a sound card. Maybe Jack Smith can respond to this question. I have no idea. > There are a few rough edges, it is easy to crash if you enter nothing into > a > checkbox that is not explicitly checked. Could you point me to the unchecked checkbox that caused the program to crash? > The stop button does not always get > enough attention paid to it. (Application->ProcessMessages ?) The scans/procedures operate under control of a Do Loop and as a result the program is slow to respond while the scan is in progress. Usually, if the user clicks Stop Test/Stop Sweep the procedure will end within several seconds. Sometimes you have to click the button a second time. The procedures are purposely slow because each time the RF Gain or Frequency are incremented it is necessary to wait a couple of seconds for the dBV reading to settle. The program uses Application.DoEvents to track events while the loop is running and allow the user to stop a scan. Thank you for your observations and suggestions. Mike, KS7D _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
