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Ordering information (for my 6700)
Setup - interfacing to the rest of the station
FlexControls - setup to run 2 or more
Powered Speakers Audio Engine 5+
Fiber Ethernet connection - RF and Lightning mitigation
Observations ( eHam review )
RF Issues and Solutions - RF ground & Common mode RF
The FLEX Radio web page
Yahoo Forum for the FLEX radios - SmartSDR forum
CW Skimmer and SDR-Bridge Setup and Troubleshooting notes 25-Mar-2017
Ordered on November 11, 2012
Received on 21-Aug-2013
6700 Recall Notice
Notice receive on 25-Sep-2014
3-Nov-2014 - shipped to Austin from Atlanta
6-Nov-2014 - received in Austin
14-Nov-2014 - PEN complete and shipped to Atlanta from Austin
19-Nov-2014 - received in Atlanta
Shack to shack was 16 calendar days, 12 business days.
Station equipment to interface with the 6700
Wiring diagram for the interface between the FLEX 6700, Alpha4040 tuner (future), Array Solutions Bandmaster III antenna switch and the DX2400 amplifier. USB interface from 6700 starting with V1.10.8
the ALC wiring is shown but not being used currently, power levels are set by SSDR.
The 4040 tuner is shown but not currently available.
Click here for pictures and more details on the DX2400 interfacing - including the DB9 serial cable for frequency data to the amplifier
BandMaster III to 6700 USB port (effective with SSDR V1.10 and later) - BCD parallel connection
Cables and setup for the BandMaster and SSDR USB configuration below. Starts with a view of the rear of the BandMaster where the cable plugs in for the frequency data.
The DB9 FEMALE connector needed is listed and more details on the Winford breakout boards are listed below.
************* Use the BCD cable **************
*************** Uset the BRKSD9F-C breakout board *************
***** Here is the wiring for the DB9 breakboard from the BCD cable. For example the orange wire connects to Pin 1 on the board. *****
****** Here is the configuration of the USB cable in the SSDR software **********
*********** Here is the configuration of the BandMaster **********
FlexControl setup to use 2 knob with SSDR
There are several ways to setup the software to use 2 (or more) Controls. Since I always have SDR-Bridge running I use it to control one knob and SSDR to control the other one. If you don't use SDR-Bride (or have it running all the time) you can also use DDUtil to control one of the knobs. Below are some screen shots showing the setup for both ways.
- To start verify that Windows device Manager shows 2 FlexControls
- Now start up SDR-Bridge and configure as below, it will then find and grab the other FlexControl knob.
- Note the message that says ďflex knobs found 1, then attached 1.Ē I have it also set to assign one knob per DAX IQ slot since I always want this knob to control slice A.
- Note: The SDR-Bridge sets the button functions to RIT, AGC, XIT. You donít have any control over the button functions.
I put some Dymo stickers on the FlexControl to remind me of the settings.
I leave the PC up 24x7 and also leave the SDR-Bridge program running on my PC 24x7. I do shut down SSDR when the radio is not in use. The setup sticks and I donít have to go back and do anything when I start up SSDR. The FlexControl knobs stay properly configured. If you shut down your PC regularly, The only thing you have to do is start SSDR first to let it grab itís knob and then start SDR-Bridge to grab the other one.
Here is the DDUtil setup if you prefer to use it instead of SDR-Bridge. It actually provides more button capabilities than SDR-Bridge but since Iím already running SDR-Bridge and not DDUtil I went with the solution that required one less program.
Powered Speakers - AudioEngine 5+
Ethernet Lightning Protection
The Ethernet port on the 6700 is a potential weak point for lightning surges. For protection I added a fiber link to electrically isolate the port. Since I also needed some addition ports in the shack, I used a desktop switch with both fiber and CAT5 copper ports.
The problem is long runs of CAT5 cable act link an antenna and a close by lightning strike will induce a voltage spike in the cable. The solution is to isolate the devices you want to protect with a short fiber link near the device. In addition a close by lightning strike can induce spikes into any of the wiring systems (phone, power, cable TV coax, etc) in your house which can jump to your ethernet CAT5 cable.
The install was plug and play and took about 5 minutes. The cost was about $150. If you don't need the extra ports provided by the switch you can use 2 media converters lowering the cost to about $100. Replacing an ethernet interface card in a PC is easy, if the ethernet interface card in your radio is damaged, it will require a trip back to Texas for repairs.
Visit the Yahoo forum for more information on the components and other Ethernet isolation solutions. Look in the FILES section for the Ethernet Lightning protection folder.
Ethernet to fiber converter
Orange fiber cable - note A & B designations
Grey CAT5 from server room
Switch settings -- all UP
Fiber Cable -- MultiMode
Switch picture - front and rear
Green CAT5 to the shack PC
Red CAT5 to the 6700
Orange Fiber to the media converter - Note A & B designations
Observations and performance
August 30, 2014 -- My eHam review
RF issues and solutions
I've noticed that my 6700 is more sensitive to RF than my previous radios. I initially had problems with the radio crashing on transmit and reporting false SWR readings on some bands. Often these problems can be remedied with proper RF grounding and RF chokes on the coax and other cables. My station grounding was already in place but will be documented below. The solution for my issues was identified and resolved by addressing the RF on the coax and other cables. Both grounding and RF on the cables is addressed below.
Without going into all of the details there are several types of grounds. It's considerd good practice to address all of the grounding strategies in a amateur station. Some say there are 3 types to consider, I list a 4th one here. The RF ground (#2 in the list) is the one that can most affect your radio during normal operation. Grounding is an often debated subject, so take what is presented here for what it is worth. The solutions worked for me but you may have a different experience.
1 - AC safety ground (the third wire in you 120V outlet in the U.S.). This is not an RF ground but as the name implies it is for personal safety against electrical shock.
2 - RF ground - provides a path for RF to a common buss bar close to the operating position and connected to a ground rod close by for all of the "boxes" at your operating position. This is not the same as the AC safety ground. Lack of a good RF ground can introduce ground loops and significantly impact you normal radio operation.
3 - Tower ground - lightning protection for each tower to an array of ground rods around your towers
4 - Dwelling lightning protection - If you live in a lightning prone area you may want to also consider installing lightning rods on your dwelling. The lightning arials are bonded to another set of ground rods around the dwelling
RF on the coax and other cables
In addition to the RF ground, you may also need to consider common mode RF feedback on you antenna coax. Ideally all of you transmitted RF remains inside the coax and is transferred to your antenna. Unfortunately this is not always the case and you can get some RF feedback on the outside of the coax and back to the station. Even if your coax and antenna are matched, radiated RF can be picked up on the coax shield. This unwanted RF is typically mitigated with a choke or ferrites at the antenna feedpoint and/or where the coax enters the shack. The results of unwanted RF in the shack can be manifest in a number of ways. Here are a few.
- RF burns
- Radio lockups ( I noticed my 6700 to be more sensitive to RF than my other radios and had this problem)
- PC lockups
- hum or noise in your audio (speakers, etc)
- false trigger on fire alarms, touch lights, etc
- False SWR readings
There are many good documents on RF chokes and common mode. Click Here for additional background.
Howard / KY6LA has put together a good presentation on "how to build a quiet station" that is also a good reference. Clike here for the presentation
Here are some pictures showing my RF ground setup. Every "box" at the operationg position gets a ground strap. Some of them are shown below
The idea is to provide a path to ground for any lighting strikes to the tower. This won't eliminate the possibility of a surge on your coax or control cables but it should help reduce it and is a first line of defense.
Lighting Rods -- installed on the house.
Harger.com is a good source for lightning protections products. If you live in a lightning prone area you may want to consider this. In addition to reducing the potential for equipment damage it could also prevent a fire. House fires from lightning happen at least once a year in our area.
RF choke for common mode
Here is some information on the ferrites I use from DX Engineering. Also the pictures show how I used them on practically all of the cables in and out of the 6700. I was having a problem where the 6700 would occassionly crash when I tapped the key in CW and it was much more frequent when using the amplifier. My strategy was to add ferrites to one cable at a time to see what had the biggest impact in correcting the problem. There were 2 area where adding ferrites had the biggest impact. Adding ferrites to the coax coming into the shack and also on the coax jumper between the 6700 and the amplifier. All of the other places I added ferrites have only a small if any effect but since it never hurts I've left them in place.
Most of the ferrites in the shack pictures below are one of the 3 sizes shown here.
Coax leading into the shack was one of the two places that had a big impact
The coax jumper between the 6700 and my amplifier is the other place that had a big effect.
The picture below shows two coax loops hanging on the back of the desk.
I added ferrites on all of the other cables also......
Note about the ethernet connection: I also implemented a fiber link for the ethernet connection. This is documented previously on the web page. Although it was added for another reason, it also helps with RF mitigation.
In additon to a number of transmitting antennas, I have a K9AY loop for receving that I use on 80M.