Hi Steve and all, First of all, many thanks for your words. I will try to describe the soil but sorry if I don´t use the right English words for it.
According to my friend LU8DPM Mario, with whom I have been doing all this effort, the soil in the area is - Mostly organic - PH neutral (acid level) - water table between 2 to 3 mts I can add it is NOT rocky hilltop or sand, it is in a plain rural area, 200 Km from the sea. Not artificial irrigated, only by rain. At the moment measurement were done, 2 months had passed without rain. When we reached 54 radials level, it rains very little (1 or 2 mm) before we took the measurement. That was the only rain in the process. I hope this help to have an idea. All the best to all....... Eddie.- LU2DKT ________________________________ From: Steve London <[email protected]> To: [email protected] Sent: Friday, September 20, 2013 4:19 PM Subject: Re: Topband: Measuring Vertical input parameters while installing radials Great empirical info, Eddie. Can you say something qualitative about your ground conditions ? For example, "irrigated soil", "rocky hilltop", "sand", etc. You are doing something right - Huge signal on topband, and you also hear very well. 73, Steve, N2IC On 09/20/2013 06:31 AM, Eduardo Araujo wrote: > Hi friends, > I finished sending the measurements data to all that >requested it. In case somebody didn´t receive it yet, please let me know. > > Even though I did not mention it before, I also have Field Strength > measurement synchronized in time with the AIM measurements. > > As surely this was not a professional procedure, I will explain how I did it > and you may judge if it is useful for you or not. > > - I installed 2 verticals antennas 3 mts long, at about 300-350 meters from > the tower base in two opposite directions. So measurement was done at ground > level. > - I did not tuned up the elements in any way, they were connected to the FS > instrument directly and as ground connection I used a 50 cm aluminum pipe > buried in the ground > > - As a FS meter I used a DIGI - FIELD from IC- Engineering > > - First 2 radials were installed more or less in the direction of the RX > verticals > - From there, they were installed consecutive in counter-clock wise. (look > from above) > - I used 20W at 1840 during daylight, and matched the antenna input for every > change in radial number. I used an MFJ-962B for this purpose. > - After all readings were done, I calibrate the readings against an HP-8640B > signal to visualize which was the change in db > > Botton line - the measured change at ground level between 2 and 114 radials > was between 5.2 in one direction and 5.8 db to the other. > > I understand this is not a professional procedure nor professional equipment > and it was done having fun enjoying the hobby. > > I will like to hear from you your thought about if this kind of measurement > done at ground level and at that distance from the antenna base has a > correlation to actual radiated Field at the maximum vertical azimuth of the > vertical whichever it is. > And, also, How the procedure or elements I used could be improved ....still > within amateur measurement accuracy and not professional level. > > > '73 to all..... Eddie, LU2DKT > > > > > > ---------------------------------------------------------------------------------------------------------------- > > From: Eduardo Araujo<[email protected]> > > To: Topband<[email protected]> > Sent: Thursday, September 12, 2013 9:28 AM > Subject: Measuring Vertical input parameters while installing radials > > > > Hi everyone, I recently complete the installation of +100 1/4 radials for the > 1/4 vertical. > > I measured input vertical parameters using AIM4170 from 1600 to 2000Kc > > I assumed it is not something new for many of you, but I wonder if the > information I collected may be of interest for some of the group members. > > I have available for sharing BMP or JPG images of each scan which were run at > 2, 4, 8, 16, 32, 60 and +110 radials. Also, I have the .scn files for each > scan which could be viewed using AIM4170 SW even though you don´t have the > unit. > > > The good thing looking at the files using the sw is that you can move the > cursor and have all the values at all fcies from 1600-2000 Kc > > In case someone is interested, let me know and I will see the way to share it. > > ´73 to everyone.... Eddie, LU2DKT > > PS: By the way, what a nice toy the AIM !!!, Even though I bought it more > than one year ago, this is the first time I use it > _________________ > Topband Reflector > _________________ Topband Reflector _________________ Topband Reflector
