Thursday, December 27, 2018

Antenna Spotting, by Jim N6TP

mountain scene
A Great Antenna Location
Antenna spotting is somewhat like the other spotting hobbies such as Bird Watching or Train Spotting.

If you enjoy amateur radio, and if you are like me, I am sure you keep an eye out for amateur radio antennas. Several years ago, on a vacation trip to Europe with my family, I indulged myself with a little antenna spotting plus some technology observations. Actually, I did not see many identifiable amateur radio antennas, but did hear and see other interesting sights.

Our itinerary took us to London for four days. London was fascinating with many changes in the last thirty years. Then we flew to Copenhagen from London via Stockholm. We picked up our bus tour of Scandinavia starting in Copenhagen, Denmark. For the next two weeks we enjoyed a two-week tour to Denmark, Sweden and Norway. By the way, we had great weather all during the trip.

You have heard a lot about airport security recently, which is mostly true. You can expect to be checked several times every time you board a flight. I suggest you wear new socks with no holes in them, as you want to avoid any embarrassment. We transited through Frankfurt Airport on the way back to home. As far as I could tell, we went through four security checks, just to get into the boarding area.  So be prepared to show that passport at all times.

My portable AM-FM short-wave radio was somewhat useful to keep up to date on the news and observe radio conditions. This particular radio has a long wave band that covers from 160 to 290 kHz. In London, I heard several broadcast stations in that part of broadcast band but not in other parts of Europe.

It is interesting to note, that there were very few English broadcasts on short wave. There were no BBC, Voice of America or Armed Forces Radio Network services that I could hear. Maybe they have all gone to the Internet or satellite. I did hear the Voice of Russia World Service occasionally in their English language programming.

In Scandinavia, the broadcast stations were on FM. There were signs posted along the highway giving the local FM frequency (e.g. 93.1 MHz) and the program service (P1, P2). The roads in Scandinavia are excellent. There were not many four lane divided highways, but the surfaces of the roads were well maintained and in good condition. Norway has gone to a great deal of expense to build an extensive system of tunnels through their mountains in the last twenty years. The tunnels have cut hours and even days of travel across the country.

TV satellite antennas were seen everywhere. Since we were above the 60-degree north parallel the faces of the dishes were nearly vertical. You may recall that the feed on the satellite TV dishes is offset, so that the beam reception angle is actually not perpendicular to the face of the dish but elevated. But it is startling to see the face of dishes apparently pointed into the side of a hill.

I did notice five or six large log-periodic antennas in Stockholm. Two were located downtown on large commercial or government buildings. The others were on embassies in the surrounding residential areas. Perhaps they were back ups for the landline communication network. Norway has a number of microwave links, connecting towns in the bottom of a valley. Many towns in Norway were isolated by land until recently.

Scandinavia has a dense personal communication service network (PCS). Our tour director used her PCS many times, checking on arrangements for lunch and accommodations. In many cases she would make the call from her front seat in the bus, in some very isolated areas. Then if you looked carefully, you would see up on the ridge somewhere, a tall tower providing PCS service for that area. It might not make economic sense in all cases, but it sure helps the economy in general.  Powering these remote locations must require some interesting solutions.

My old Garmin II Plus GPS provided some entertaining moments. I would sit in the back of the bus near a window and take readings on our speed and position. The tour buses in Europe have a recording device, which measure the speed and distance traveled each day. There are European Union regulations governing the time that the driver can spend on the road. The bus had a speed limit of 100 kilometers per hour as marked on a sign on the back of the bus. The GPS confirmed that the bus’s maximum speed was right up there at 100 km per hour. He never seemed to exceed it. The GPS was useful. I made a point of marking the hotel locations. On a couple of occasions, I led the family back to the hotel by using the bearings from the GPS. Maps are great but unless you are familiar with the scale and the names of where you are then, you may be in trouble. The more recent versions of the GPSs could have built-in maps for Europe.

The most northerly point of the trip was in Norway at N62.46 degrees. The far north longitudes of course are much closer together as they converge the closer you get to the North Pole. So, it does not take much east-west travel to go from one longitude to another.

The scenery was wonderful. The family took hundreds of pictures and everyone had a great time. The flying was not fun but worth the hassle and inconvenience.

Jim N6TP

Sunday, December 16, 2018

Magnetic Loop Antenna Tuning

Dan (KC4GO) shared a video of his magnetic loop antenna being tuned across the 40 m band. The narrow bandwidth of the antenna can be seen as the peak in signal level moves up and down the band.

The occasional large vertical jumps in the panadapter display (upper half) are caused by distant lightning activity. Each of these signal bursts also appears on the waterfall display (lower half) as a very thin, horizontal line, since the lightning energy is very broad-banded.

While the video is playing, you can type f or click on the box near the bottom right corner of the player to switch to a full-screen view of the video. 



Thanks, Dan

Tuesday, June 26, 2018

Volume control on multiple RCForb clients

My previous post showed 3 instances of the RCForb client running on a single computer / monitor setup. The receive audio from all clients connects to a single set of speakers. Although the receive volume sliders on the clients can be used to select the best audio for a given received signal, this is not the most convenient method. An alternative is to use the Windows Volume Mixer.

The (Windows 10) screen shot below includes 2 RCForb client audio sliders.


Any audio source can be adjusted independently from this mixer panel. Any source can be muted by clicking on its blue speaker icon at the bottom of its slider, as shown in the screen shot below.


Send me any questions or comments.

73,
John WA5MLF





Thursday, June 21, 2018

3 Remote Rigs on One Screen

During today's RV Service Net (2nd hour) the net control station W4BXI had the use of 3 remote stations, connected via RemoteHams software.  At my location I arranged a display of the 3 remote clients on my wide screen (2560 x 1080) monitor.  Below is a screen shot of the arrangement.
Click to enlarge.
The RemoteHams RCForb client software provides a single user interface that resembles an Elecraft K3 transceiver, regardless of the brand and model of the transceiver it controls. Each station owner can choose which controls to make available to the remote users.

I closed some of the extra elements of the RCForb client windows, and slid the bottom parts (chat window and list of users) below the bottom edge of my desktop. I could still move a window up temporarily to take a peek at the user list.

The 3 client windows, from left to right, are connected to: WA5MLF, W4UOA and KC4GO. 

The upper left corner of the screen displays the KE9NS version of the PowerSDR program that controls my Flex-3000 transceiver. There I could view the strength and quality of the received and transmitted signals, and access settings that I have not enabled for the remote users.

The upper right has my Firefox web browser window where our Bell Ringers chat window is seen. I have other browser tabs (e.g. email) available for quick viewing with a single mouse click.

Send me any questions or comments.

73,
John WA5MLF



Thursday, April 5, 2018

Remote Station Operation

Here are two articles, with diagrams, that I wrote recently for use in the RV Service Net newsletter.  Any feedback and suggestions are welcome.


Many regulars on the RV Service Net recall that John, W4BXI, served as the second hour net control station on Thursdays, operating from his home at Fort Payne, AL. After moving to Asheville, NC, he now lives in an apartment that has no provisions for HF radio operation. John’s friend Carl, W4UOA, (at Mentone, AL) established a new remote interface to his own station for John to try from his new home. Carl has used other configurations of remote access to his station over a number of years.

Initially John used a single laptop PC, equipped with free software from RemoteHams.com to connect to Carl’s station. After getting familiar with the software interface (RCForb client), and finding it satisfactory for continuing his presence on HF radio, John resumed operation as a net control station. W4UOA is an excellent station for John’s participation in the RV Service Net.

Over a short period of time, John discovered other stations that are using the same RemoteHams software. This provided an opportunity to access other receiving locations, to hear stations that are too close to W4UOA for good reception during the early morning propagation on 40 m. John accessed the Richmond, VA, club station W4FJ that is available for receiving and transmitting, for club members. John also added receive capability provided by his RV Service Net friend Dan, KC4GO, of Casselberry, FL .

Around the same time John asked if my station in Baton Rouge, LA might be able to provide transmit / receive operation using the RemoteHams software. Previously I sometimes provided receive audio from my transceiver to John via a web interface (Google Hangouts), during his time slot on the RV Service Net. I set up the needed RCForb server software on my Windows PC that operates my Flex-3000 transceiver. This enabled John to use another remote station farther to the southwest.

The diagram below shows the current group of remote stations (in 4 states) that John uses from his operating location in North Carolina. Although these remote stations make it easier to hear reports from the many stations that check in, they don’t replace the excellent help provided by relay stations who are often located in even better locations for hearing and talking to the widely-distributed participants.

Click above to enlarge.

In a separate article I will provide additional details about how the RemoteHams software connects to radio equipment and the Internet.

John Krupsky, WA5MLF


W4BXI and friends have tested various software and hardware approaches during the past several years for remote operation of ham radio stations. We are currently using software from RemoteHams.com. In a single software package, RemoteHams includes both rig control (along with CW keying, memories and DX spotting) and audio transport. Some previous approaches have required the use of separate audio transport (e.g. Skype) and control software.

The RemoteHams software was designed to interface with the Elecraft K3 transceiver, but currently supports many other brands and models. A single, universal interface is provided for control of any supported transceiver.

For anyone thinking about remote station operation we suggest installing the free RemoteHams (RCForb) client program and using it to listen to any of the online stations listed in the RemoteHams directory. You can find many on this Online Map. The client software runs on Windows computers and Android devices. The RCForb client enables the remote operator to receive and transmit (depending on permissions granted by the station owner) and to select frequencies, modes, power levels and other parameters that are configured at the remote station. The diagram below shows the components at the location of a remote operator. The Documentation section has a good “getting started guide” along with client and server manuals. 
 
Click above to enlarge.

The diagram also shows a RemoteHams server that is used for:
  • registration and authentication of licensed remote operators
  • publishing a directory of online stations that can be used with the RemoteHams software
The server is contacted each time a remote station’s server software or a remote operator’s client software is started, but is not involved in the client-server traffic.

A remote station is not required to be listed online. Many owners of remote stations choose to operate on a non-listed basis, but can allow their friends or club members to access their station with a non-listed link.

To set up a station for remote operation requires interfacing a (supported) transceiver to a Windows computer that is running the free RCForb server program. The diagram below shows the components at the location of a remotely-controlled station. Transceiver interfacing for operating the many digital modes (PSK, FT8, etc.) provides the same capabilities needed for the RCForb server program.

If you decide to explore this mode of operation, we recommend consulting the server manual in the Documentation section and the Support Forum section of RemoteHams.com for additional documentation and tips from other users. The RemoteHams software also provides remote operation of supported amplifiers, antenna tuners and rotators.

Other topics that must be considered for the establishment of a remotely-operated station include:
  • Control of electrical power to radio and computer equipment
  • Ability of radio and computer equipment and software to restart if power is interrupted
  • Protection from lightning and electrical surges
  • Remote access to the server computer if changes to the server software settings are needed
Remote control software provided by the radio manufacturers for their radio products may provide additional capabilities that are not available through the RemoteHams software, such as SDR panadapter views. We suggest that you evaluate the capabilities of any remote control solution that control your radio equipment, and decide based on features that are most important to you.

John Krupsky, WA5MLF

Wednesday, February 14, 2018

Sampling of Group Videos & Screen Shares

While browsing through some files on an older hard drive I found some collected screen shots of some past group videos and screen shares that were common among our group members on morning QSOs. Below is a sampling of these, in order by date, starting in 2009.  The file name of each image shows the date of capture. The newest screen shot is from July of 2017.

Our group sessions made use of three services: Adobe ConnectNow (free for a limited time), Skype and Google Hangouts. Some of the later screen shots show that it is possible to participate in two separate sessions simultaneously on the same computer. In that case it is good to keep track of the microphone muting in each session window.

I added text notations to some of the views. Click on any image below to see an expanded view.























73,
John WA5MLF