Search Results for: aim

AIM4170 – de-embedding the feed line in remote measurement – a simple match

At AIM4170 – de-embedding the feed line in remote measurement a set of measurements of a monoband antenna looking from the transmitter were analysed to de-embed the feed line and arrive at the indicated feed point impedance. This article explores a simple series match to improve the load seen by the transmitter. In the Simsmith … Continue reading AIM4170 – de-embedding the feed line in remote measurement – a simple match

AIM4170 – de-embedding the feed line in remote measurement

At nanoVNA-H – de-embedding the feed line in remote measurement I recently wrote on a procedure that can be very useful to refer measurements made at the transmitter end of a feed line to the antenna feed point. A correspondent recently shared an AIM 4170 scan file of his 40m half wave dipole antenna system … Continue reading AIM4170 – de-embedding the feed line in remote measurement

AIM 916 produces internally inconsistent results

  AIM915a was recently pulled from the distribution site and replaced by a new release, AIM916. AIM916 chokes on some calibration files created with earlier versions, so again historical scan data is rendered worthless. Note the illogical diagnostic message… typical AIM quality. I cannot recall ever finding a new release that did not have significant … Continue reading AIM 916 produces internally inconsistent results

AIM 915a produces internally inconsistent results

  AIM915 was recently pulled from the distribution site and replaced by a new release, AIM915a. I cannot recall ever finding a new release that did not have significant defects, commonly inconsistency between displayed values. In the common theme of one step forward, two steps backwards, this version has defects that were not present in … Continue reading AIM 915a produces internally inconsistent results

AIM 915 produces internally inconsistent results

  AIM914 was recently pulled from the distribution site and replaced by a new release, AIM915. I cannot recall ever finding a new release that did not have significant defects, commonly inconsistency between displayed values. In the common theme of one step forward, two steps backwards, this version has defects that were not present in … Continue reading AIM 915 produces internally inconsistent results

AIM 914 produces internally inconsistent results

  A new release, AIM914 appeared recently. In the common theme of one step forward, two steps backwards, this version has defects that were not present in AIM910B. Let’s review the internal consistency of this part of the display screen. Most of the values given above are calculated from a single measurement value, and should … Continue reading AIM 914 produces internally inconsistent results

AIM system – AIM912 initial checkout

Given that most versions of the AIM software that I have tried have had serious defects, I approach the latest release, AIM912, with caution. An interesting opportunity presented when a correspondent sent me some .scn files captured from an AIM4170B using AIM912. Above is the correspondents .scn file opened in AIM912. Last update: 13th February, … Continue reading AIM system – AIM912 initial checkout

Review of Dunlavy’s STL patent gain claims

(Dunlavy 1967) sets out his description of a wide range tunable transmitting loop antenna and makes a broad efficiency claim of better than 30% (-5.3dB) for his system. Minimum efficiencies of 30 percent are attainable with practical designs having a diameter of only 5 feet for 3-15 Megahertz coverage. In a context where extravagant claims … Continue reading Review of Dunlavy’s STL patent gain claims

Accuracy of AIMuhf system – AIM910A vs several recent versions on a ferrite cored inductor

Yet another release of AIM software is available, 910A at the time of writing. I have downloaded and tested 8 versions this year, most have been wanting. Again, there is very little detail on what has changed and likely impact on historical measurments. A quick set of measurements was made on my test inductor pictured … Continue reading Accuracy of AIMuhf system – AIM910A vs several recent versions on a ferrite cored inductor