Remote Operating Gateway Client/Server Architecture
The next step in our Software Defined Radio/Remote Operating Project was to build a Remote Operating Gateway System in our shack and setup Client PCs to operate our station remotely. In a previous article, we explained how we integrated a FlexRadio 6700 Software Defined Radio (SDR) into our station to create a platform to build our remote operating project around. The project has turned out to be somewhat involved so we will be providing a series of articles to explain what we did:
In this article, we will explain the additional hardware and software that we used to enable remote operating as well as some additional equipment we added to our Client PCs that we use to operate our station remotely. The reader may want to refer to the picture above as you browse this article to better understand how the parts in our remote operating setup fit together. You can click on any of the pictures here on our blog to see a larger, easier to read version of them.
SmartSDR Software Operating With A FlexRadio 6700 SDR
FlexRadio’s SmartSDR Software handles operating the SDR remotely. At the present state of maturity, SmartSDR can operate over a wired or wireless Ethernet LAN connection. At present, both SmartSDR and the FlexRadio-6xxx hardware must be on the same sub-network to function properly. FlexRadio has indicated that they plan to enable SmartSDR operation over wide-area broadband internet connections in the future. The design that we chose for our Remote Operating Gateway and Client PCs will allow operation of our entire station over the internet when SmartSDR is capable of fully supporting this. SmartSDR handles remoting of audio (microphone and speakers/headphones) as well as CW keying over our Home Network (more on this later) as well as control of the radio. With these key functions taken care of, we need to also remote the following functions of our station to fully support remote operation:
Remote control of equipment power is particularly important to provide a means to reset/restart equipment remotely as well as a means to shut down the Transmitter remotely.
Remote Gateway Control Stack – Antenna, Power and Monitoring
Remote control of power for the components in our Remote Operating Setup is handled by a RIGRunner 4005i power control device. This unit provides remote power control over a network for up to 5 separate groups of devices. It also provides voltage/current monitoring and solid state over-current protection as well.
RIGRunner Remote Power Control Setup
The figure above shows how we setup our RIGRunner 4005i. The device is controlled over our Home Network via a standard Web Browser. As you can see from the picture above, this devices lets us remotely control power to all of the devices in our Remote Operating Setup.
Remote Control Relay Unit
The FlexRadio-6700 SDR requires some additional power control handling. Simply removing and applying power to the FlexRadio-6700 SDR will reset the radio and leave it in a power off state. The FlexRadio-6700 SDR does have a remote power control input which can be controlled via a relay closure. We used a microbit Webswitch 1216H device to provide a remotely controlled relay closure to control the power off/on for the FlexRadio-6700 SDR.
Flex-6700 On/Off Control Via microbit Webswitch
The microbit Webswitch 1216H relay unit is also controlled over our Home Network via a standard Web Browser.
SmartSDR Setup – Remote On/Off Control
The FlexRadio-6700 SDR is configured for remote on/off operation via the Radio Setup dialog in SmartSDR as shown above. A cable is run between the remote power on/off port on the FlexRadio-6700 SDR and the microbit Webswitch 1216H relay unit to complete this part of our Remote Control System.
Beams On Our Tower
It is also important to have full remote control of our Antennas and Rotators to effectively use our station from outside our shack. Control of our Rotators is accomplished by software which remotes serial COM ports over our Home Network.
Network Serial Port Kit
We used the Fabulatech’s Network Serial Port Kit package to remote the serial COM ports used to control the microHAM Station Master Deluxe Antenna Controller, the associated antenna Rotators and the WinKeyer associated with our FlexRadio-6700 SDR. This software runs on both the local Server computer in our shack which hosts the Remote Operating Setup and any Client PCs which are used to operate our station remotely.
microHAM Station Master Deluxe Development Application Via TeamViewer
There is not currently a production software tool to enable remote control of the microHAM Station Master Deluxe Antenna Controllers which we use in our shack. I am planning to develop our own application to do this in the future. The folks at microHAM have been so kind to provide me with the interface specifications needed to control the Station Master Deluxe Antenna Controller remotely along with a Developer Only test application (shown above) which can be used to understand the microHAM Device Protocol. In the interim, I have been using the microHAM Developer Only application along with the TeamViewer Remote Control Software to control antenna selection remotely and to monitor the position of the current selected rotators.
Shack Remote Operating Gateway Server PC Applications
The remaining software required for remote control of our station is provided by the Elecraft applications which control the KPA500 Amplifier, KAT500 Auto-Tuner, and W2 Wattmeter which are used in our Remote Operating Gateway setup. All of these applications along with the microHAM Developer Only Application for Station Master Deluxe control and the DDUtil Program which interworks the FlexRadio-6700 SDR CAT interface with the Station Master Deluxe (see the previous article in this series) are shown above running on our Shack Server PC. This PC is on at all times and is protected by a Uninterruptible Power System (UPS) to ensure that it runs trouble-free.
Remote Operating PC Client Software Applications
In addition to FlexRadio SmartSDR, each of the Server Side PC applications has a corresponding Client Side application which is used on the Remote Operating Client PC. Shown above are the three Elecraft Client applications for Amplifier, Auto-Tuner and Wattmeter control and monitoring. The client side Network Serial Port Kit application which replicates the WinKeyer, microHAM Station Master Deluxe and Rotator Control COM ports is also shown.
Heil Microphone And USBQ Adapter
The PC in our home office will be a primary remote operating location for our station. Audio quality is important to us and we wanted to ensure that the quality of our audio was just as good operating remotely as it is when we operate from our Shack. To accomplish this, we installed a Heil PR781 Microphone, PL2T Boom and USBQ Adapter/Pre-Amp on our home office PC. The Heil USBQ is a USB sound card and microphone pre-amplifier which connects directly to the PR781 microphone to create a high-quality phone audio source which can be used with the FlexRadio-6700 SDR when operating remotely.
Bose SoundLink Bluetooth Headset
The speakers our my home office PC are quite good but there are often times when a set of headphones are needed to hear weak signals. We choose a quality Bluetooth Headset from Bose for this purpose. The Bose SoundLink Headset is light weight, is wireless, has excellent fidelity and includes a very good microphone which can be used as an alternative to the Heil PR781. This headset is also very useful when operating from our Laptop Client PC from noisy locations outside our home (more on this in a future article).
SmartSDR DAX Control Panel
The last pieces of the remote operating system are provided two applications which are part of the SmartSDR software package. The SmartSDR’s DAX Control panel provides remote audio connections for Digital Mode Software and the CW Skimmer decoder. Audio is provided by software “audio cables” for each of the FlexRadio SDR’s Slice Receivers and the active Tx Slice. SmartSDR DAX Audio IQ interfaces are also provided for each of the SDR’s Panadapters which permits software like CW Skimmer to monitor and decode a wide range of frequencies simultaneously.
The SmartSDR CAT application provides CAT interfaces on both our Client and Server PCs for applications which need to control or monitor what the FlexRadio-6700 SDR is doing. Many loggers and other applications are beginning to implement direct IP interfaces to the CAT channel of the FlexRadio 6xxx Series SDRs. This approach simplifies interworking between the software and the radio and appears to be more reliable than virtual COM-based CAT interfaces.
Client PC Running SmartSDR And The DXLab Suite (Home Office)
With all of the above elements in place, any client PC that can access our Home Network can be used to operate our station. The picture above shows SmartSDR and the DXLab Suite running on our Home Office PC. The remote emulations of the Rotator, CAT and Winkeyer interfaces are such that DXLab’s applications can fully operate our station as if they we running in our shack.
Client PC Running SmartSDR And The DXLab Suite – Right Monitor
The picture above shows a closer view of my Home Office PC’s Right monitor (click on the picture to enlarge it). SmartSDR is running the upper left corner and I am listening to folks operate in the 2015 CQ WW DX CW Contest. The SDR is set on the 20m band and I have the CW Keyer which is built into SmartSDR running. The DAX Control Panel is running on the lower right corner of the screen and its setup for use with the CW Skimmer decoder. DXLab’s WinWarbler is running (top-center) which enables me to use the WinKeyer in the shack to send CW as well via the remote COM port associated with the WinKeyer. Below WinWarbler is the microHAM Developer Only application (accessed remotely via a TeamViewer connection to the Shack Server PC) which shows that I have both of our SteppIR DB36 Yagis are selected as a stack and pointed towards Europe. DXLab’s DXView Rotator Control application is running in the center-bottom of the screen so that we can turn our Yagis towards other parts of the world (rotators are controlled via another remote COM port). Finally, the client KPA500 Amplifier control application is running in the lower left corner to control the amplifier and to monitor the power out and SWR seen by the amplifier being used to operate remotely.
Client PC Running SmartSDR And The DXLab Suite – Left Monitor
The picture above shows a closer view of the left monitor. DXLab’s logger, DXKeeper is running at the top/center of the screen. Below it is DXLab’s SpotCollector application which is monitoring spots of the many CW stations around the world that are operating in the contest. DXLab’s Commander applications is running in the lower-right corner of the screen and is monitoring the FlexRadio-6700 SDR’s slice Tx/Rx frequency as well as providing a control interface of the SDR to the rest of the DXLab Suite (via SmartSDR CAT). The Elecraft W2 Wattmeter client control application is just above commander. The W2 Wattmeter client application provides higher resolution power out and SWR monitoring for the remote setup. Bottom-center is DXLab’s Launcher application and just to the left of that is the KAT500 Auto-Tuner Client Control application. Finally, CW Skimmer is running on the left side of the screen.
CW Skimmer Operating Remotely
As you can see, CW Skimmer is decoding a wide range of frequencies in the 20m CW sub-band. It is receiving its audio in IQ format via the SmartSDR DAX application. It is great fun to operate CW this way and I am finding myself making a lot more CW contacts now that I have the remote operating setup in my office.
The next post will provide some samples of remote operation in the form of videos. I will also share some information on setting up a Remote Operating Client on a laptop where screen space is more limited. We plan to take a trip outside our house to operate our station over the Internet and we plan to share information on how that is done. We will also provide future articles on how to setup CW Skimmer and Digital Modes (RTTY, PSK and JT65/JT9) on the HF Bands and use them remotely.
For now, we are really enjoying the freedom to operate our station remotely!
– Fred (AB1OC)