The radio is mounted on the Neewer Z Flex Camera Bracket. The radio is very secure on this mount and is easily attached to the bottom of the radio. Take note to the Palm Pico Paddles attached to the right hand side of the Z mount.
One of the complaints I had about the IC 705 was the capacity of the battery . It's only 1800 mah. After doing some research, I found out that Batteries America offers a much higher capacity battery. Their battery is rated at 3350 mah. That's almost double the capacity of the stock Icom battery. Batteries America part number is: BP-307Li I also ordered the quick charger to go along with the above battery. Batteries America has a package deal for both the battery and charger that will save you a few dollars.
Icom's published current drain on receive is between 500 and 800 ma. I used a Fluke VOM to check the current drain and found the current drain to be a lot less. I removed the Icom clip on battery and supplied 8.4 volts from an adjustable power supply. There must be a boost circuit built into the radio, that is in line with the clip on battery, because the radio would not put any power out with only 8.4 volts from the external power supply. The current drain for receive with the display on is only 335 ma with 8.4 power supply voltage. To get 5 watts out, I had to increase the external voltage to above 10 volts. At 5 watts out the current drain was 1.6 amps into a 50 ohm dummy load. At 12 volts, the radio can put the full 10 watts out. With 12 volts supplied to the radio, at 10 watts out the current drain is 2 amps and receive current drain is only 225 ma. At 13.8 volts of supply voltage the receive current drain is now only 200 ma. Using the BP-307 Li battery should offer you a reasonable amount of time to operate portable in the park. You can not get 10 watts out using either of the two batteries. By using a 3 cell LiPo battery, fully changed, you will get about 7 watts out.
So why does Icom say the current drain is between 500 and 800 ma? For the clip on battery to supply 10 volts or more, you have to use a boost circuit. By doing so, you increase the current drain on the battery.
There are numerous battery charging options for the 705. One option is charging via the USB cable. When the radio is connected to a computer and the computer is on, the battery is being charged. This can be an advantage or a disadvantage? For me, I turned that feature off. When operating portable, powering the radio with the radio's battery and hooked to the computer via USB cable, leaving the USB charging on, the radio will add to the computer's battery power drain. The battery can also be charged via the DC power cable. Whether the radio is on of off, with power applied to the radio, the battery will charge. You can change this so the battery is charging only when the radio is turned off.
The IC 705 has three preset adjustable IF filters. Navigating through the DSP filtering is super easy. Since I mostly operate CW QRP, adjusting the bandwidths are my top priority. To do so, on the radio's screen, touch and hold the, "FL1" icon. This will open the filter adjust window. At first the window will display the dual pass band filter settings. To set the actual band width, click on the, "BW" icon. This will open the band width window shown to the left. Take note that I have Filter 1 adjusted to a 400 hz band width. This can be changed by using the VFO knob. I next changed to, "FL2" and adjusted it to 250 hz and, "FL3" to 100 hz. When finished setting up the filters, just tap on the, "Exit" button below the display. Now just tap the filter icon to cycle through the filter selections.
The same can be done for SSB. I adjusted my SSB band widths to the following: FL1=2.4 khz, FL2=2.0 khz and FL3=1.8 khz.
Setting up the transmit audio and band width is most important. There is so much bad audio on the bands from hams that just do not have a clue as to what they are doing. Here are the settings I use and I have gotten all good audio reports.
Set the Mic Gain to 50%. Turn on the RF speech processor and set it to 5. The next item to address is the transmit band width. Tap the, "Function" button and go to screen #1. "TBW" stands for transmit band width. If you like broad band audio like most rag chewers prefer, set this to, "Wide" (100 hz to 2900 hz) If you like working DX and breaking pileups, you would want to set this to, "Mid" 300 hz to 2700 hz. The Mid setting cuts off some of the base in you audio. You want to cut off some of the bass for working DX or breaking pileups.
The stock microphone that comes with the radio does a nice job. The speaker in the microphone does not sound as good as the speaker in the radio. By only plugging in the smaller plug on the microphone cord, the speaker in the radio will stay active. All of the microphone functions will still work by not plugging in the larger plug on the microphone cord. The larger plug is strictly for the speaker in the microphone.
The DC power plug for the radio is 5.5 mm x 2.5 mm. All of my low power power cables using this type connector measures 5.5 mm x 2.1 mm. My KX2, KX3, Daiwa and Palstar watt meters as well as so many other pieces of electrical equipment related to the hobby all use the smaller connector. Rather than start making up spare power cables for the 705, which uses the bigger connector, I did a little shopping and found a nice 90 degree adaptor on Amazon. The male end of the adaptor will fit the radio and the female end will accept the 5.5 mm x 2.1 mm plug. Now I don't have to carry along a dedicated Icom power cable when going portable.
A word on an antenna tuner: I've read the Icom manual numerous times and there is not one reference as to how high of an SWR it is acceptable to use with this radio without an external ATU. The only reference I saw was where they mention that the Icom's external ATU should be able to lower the SWR to a value of 2 to 1 or less. I ran a few tests checking when the radio goes into SWR protection. At 10 watts out with an SWR of 2 to 1, the radio still puts out its rated power. The reflected power is 1.2 watts. Since the radio uses reflected power and not SWR as a reference for protecting the finals, with lower power out you can run into a higher SWR. So at 5 watts out and an SWR of 2 to 1, you only get .6 watts reflected. With less reflected watts the radio can handle a little bit higher SWR. I found that the radio still puts out the full 5 watts into an SWR of 2.5 to 1. I set my SWR limit at 2.5 to 1 when running 5 watts out. I set my 705 for a maximum power out of 5 watts. For portable operating I either run 5 watts QRP or 40 watts from another radio.
Since I only use matched resonant antennas and I don't operate into an antenna with an SWR higher than 2.5 to 1, I don't need an external ATU. That's not to say that I won't take an ATU with me when I operate portable. I do plan on purchasing the Elecraft T1 low power ATU.
Hardware: There are five threaded holes in the bottom of the radio. One hole is 1/4" - 20 UNC threads and mostly used for a camera tripod or the above Neewer Z flex camera bracket. The other 4 threaded holes accept the follow metric screw size: M4- .07 x 10. These can be purchased at most box stores or hard ware stores.
As far as my cons go, they are not really deal breakers. I do think an onboard broad band ATU should have been incorporated, but when using low power one should really use a matched resonant antenna to maximize one's signal. Plus the 705 can easily handle up to a 2 to 1 SWR and still supply full power out. By limiting your power level to only 5 watts out as I do, you can transmit into a load of up to 2.5 to 1 SWR and still get 5 watts out without any issues. The ATU's in most radios today are programmed to handle SWR values of up to 3 to 1. So this radio being able to handle up to a 2.5 to 1 SWR is not to far from operating on radios that have an ATU that can only handle up to a 3 to 1 SWR with the use of their ATU.. So would an onboard ATU really make that much of a difference? I guess that really depends on how bad your antenna match is.
Setting up portable is always a lot of fun. Shown is the IC 705 in the back of my van. I like to be comfortable. The radio is set for maximum power out of 5 watts. I operate CW and SSB only. The optional 3350 mah battery lasts me for as long as I need to operate from early morning until about 1300 hours. I carry along the standard battery that came with the radio just in case the bigger battery dies.
The antenna is a home brew 20 / 40 meter dual band wire vertical. The van is the counterpoise for the antenna. Since I only run 5 watts max, I can get the full power out up to a 2.5 to 1 SWR. What this means is, I can cover the entire 40 meter and 20 meter bands without the use of an external tuner.
To the right shows the 28 foot fiberglass mast attached to the back of the van.
I mostly used the dual band wire vertical, but other times I may use my half wave end fed 40 meter antenna. I'll feed the antenna from the top of the mast and tie the other end off to a tree.
From time to time I do set up portable at a picnic table in a local park. I enjoy being out in the fresh air, but sometimes the park gets crowded and it's not a good idea to have a coax running from the radio to the antenna. I don't want to create a tripping hazard. Since the van setup is a completely self contained package, antenna included, this is a better way to setup to avoid any issues.