Tuesday, September 16, 2014

FoxDelta Analyzer at Tuner Input

Here is an example of what the FoxDelta Antenna Analyzer sees when connected to the input of my LDG AT-100Proll. The graph has plots for three frequencies at which the tuner was tuned:
  • 3740 kHz  - Blue curve
  • 7191 kHz  - Red curve
  • 14200 kHz - Green curve

Click on the image above for a magnified view. 
All plots were done with my 80 m horizontal loop antenna connected to the output of the tuner. For each frequency I performed the following steps:
  • Tuned the tuner for minimum SWR with the transceiver as a source at the selected frequency
  • Connected the analyzer in place of the transceiver
  • Ran a scan from the analyzer software

Using the analyzer mode that enables 3 separate scans to be displayed on a single graph, I saved the composite graph and added frequency labels next to the color legend at the bottom of the graph.

You can see that a good dip in SWR is obtained for first two frequencies. At 14200 kHz, however, the short (84-ft) feed line length did not allow the lowest SWR to be obtained within the 20 m band.

Wednesday, September 3, 2014

TPWINLOG -- Editing log file

During a morning HF roundtable QSO we discussed the ability to edit a log file created by TPWINLOG. Sections 7.1 - 7.3 of the program's ReadMe file discuss the format of the log file.

A user may want to edit the log file in scenarios such as:
  • Error (e.g. name or call sign) discovered just after a contact is logged
  • Duplicate contact logged intentionally with DUPE tag for later correction
  • Error in band or mode recognized and noted for correction while not operating the event

After exiting the TPWINLOG program, during a break in operating or after the event concludes, you may use a plain text editor program (e.g. Notepad) to edit your log file QSOLOG5.TPQ. It would be prudent to first make a backup copy of the file. When editing the file, it is best to avoid changing the lengths of certain data elements: chapter, band, mode, date, time. The call sign, name, and comment fields will be of variable length.  After editing QSOLOG5.TPQ, when you run TPWINLOG the contact log display and scoring will be updated to reflect the edits. Now you can run the Print feature to generate the output log report on paper or in a file for emailing.

Below is a series of screen shots showing a log of 5 practice log entries and an edit applied to one contact. (Click on any image to expand the view.) The first shows a 5th contact was identified by the program as a duplicate, but was accepted by the operator as a DUPE entry and is not counted in the tally of 4 contacts.



The next screen shows the QSOLOG5.TPQ file opened in a plain text editor. In this example, the operator forgot to change the band to 80 m, but logged the contact as a dupe for later edit. He could have changed the band before Inserting (logging) the contact.


The next screen highlights the changes in the band and the comment field (removing the DUPE tag).

Finally, when the TPWINLOG program is re-started, the log screen reflects the revised tally of 5 contacts.
As noted previously, it's a good idea to practice using the program to log practice contacts and to print the log results. Just be sure to delete the practice contact log before CQ TP starts. See section 4.1 of the program's ReadMe file.