LNR Precision MTR4B V2 Introduction 

It is great to carry a 7 ounce radio. I just wish it had DSP filtering. The front-end is too wide.

Yessir. I like 72.

I’m glad you found it helpful. I like the MTR4B and the V2 version. Carrying a 7?ounce radio that can communicate across the globe is very appealing. You might enjoy my last SOTA video. The Expedition to Wesser Bald. It features the MTR4B V2 in action. 73, de N4HNH

I had to wait 2 months and that was before COVID-19. It is a great compromise (7 ounces) transceiver. I wish it had a 500 Hz filter and I wish they would offer a 60m option instead of 80m. But alas there is no one perfect transceiver. That said, I love carrying a 7 ounce transceiver that can run on a 9 vDC battery. 73, de N4HNH

You’re very welcome! Glad to help. 73, de N4HNH

And thank you Alenjandro for referring to that measurement and the time mark where it's found on the video..... very useful.

Hope you enjoy it!

Thanks for watching, William! 73, Doug

I’m liking it thus far. 73, de N4HNH

Welcome aboard! 73, de N4HNH

Yes, I’m thinking the watch may fade away. However, I noticed a flaw in the programming for the built-in clock that gives me pause. If you long press Fn and cycle through the menus, and happen to stop on Set Time, it automatically resets the time to 0:00. Might keep the separate one for a bit. But I’m usually logging with OutDLog so I can get buy without either the watch or the radio clock.

@@n4hnhradio Your video just inspired me to do my version of the clipboard idea. Stay tuned.

@@CaptainRadioAdventures be sure to share. The credit for this one goes to KC4WZB. He is amazing and repurposing stuff.

The little arrow buttons work fine. I found that having buttons instead of knobs is an advantage to buttons with little, portable, radios. It’s too easy to accidentally bump the knobs and knock myself off frequency. With the up/down arrows, my frequency setting doesn’t move. Yes, I really like the Palm Pico Paddles. It’s a shame they are out of business. 73, de N4HNH

I don’t think it is adjustable, I’ve never tried. I bought a portable speaker that has a volume control.

It’s a Pico Paddle. Made in Germany. They went out of business a few years ago, but I heard that there are some similar models on eBay. 73, de N4HNH

Hi Karen! The NY4G portable EFHW antenna is available at: www.ny4gefhw.com/ 73, de N4HNH

I use either a Red Tiger 11.1VDC 15C 1100maH LiPo battery or the 50C 3000maH version. I’m not sure if Red Tiger is still available though. But just about any RC Hobby store will have this type of battery. I changed the connector to a Deans connector, since the Deans is smaller and lighter. The 1100 maH 15C battery is plenty of power for the MTR4B V2. I could do 2 or 3 summit activations and it would still have charge left. The 3,000maH 50C can power my FT-891 at 45W for around 50 contacts. 73, de N4HNH

I’ve been carrying a FT-891 on my back for 3 years. It is phenomenal, but it weighs 5 pounds. The MTR4B won’t replace it. But I’m ready to hike with a 7.95 ounce radio in my backpack. 20-30-40-60 meters are my main SOTA bands. I wish the MTR4B could work on 60 meters but it does 80 instead. 60 works better for regional contacts during the day. But I can get most of my SOTA contacts on 20-30-40. Rest assured the FT-891 isn’t going anywhere. 73, N4HNH

The key is a Pico Paddle. American Morse also makes a nice key. The case is from Amazon. Here is a link: Portable Carrying Case Bag for GoPro Camera and Gopro Accessories,Hapurs Durable Travel Carry Protective Case Storage Bag for GoPro Hero 2 3 3+ 4 Hero 4 Session Hero 5 Session and Accessories www.amazon.com/dp/B071FGC12H/ref=cm_sw_r_cp_api_glt_fabc_KHWB8GGGNFHQ8CSNZJR7?_encoding=UTF8&psc=1 73, de N4HNH

It doesn’t decode TX or RX. It can store 3 prerecorded messages and play them back over the air. 73, de N4HNH

You get the addition of the 80m band. I wish LNR Precision had included 60m instead of 80m. We get better propagation with 60m during the daytime here in the Southeast. But I have made contacts with my close-in friends using the 80m option. These are SOTA chasers who are too far for 2 meters but too close for 40 meters. The MTR4B V2 is a battery miser. It only draws 27ma on RX, versus 45ma with the SW3B. At 5W TX, the MTR4B V2 and the SW3B are nearly equal, with the MTR4B V2 drawing 750ma and the SW3B drawing 800ma. The MTR4B V2 weighs 7.95 ounces, while the SW3B weighs 6.35 ounces. The SW3B has a RF Gain control. The MTR4B V2 does not have a RF Gain control. The SW3B has a volume (AF Gain) control. The MTR4B V2 does not. I use earbuds with an inline volume control. I sometimes use an Anker Soundcore Mini external powered speaker. It sounds very good and has a volume control. LNR Precision doesn’t want us to exceed 13vDC to power the MTR4B V2. I use a LiPo battery that charges to 12.7vDC. I built an adapter with a 1N4007 diode in series with the positive wire, allowing me to power the radio with a LiFePo4 battery from Bioenno. With the diode, the voltage going to the radio is 12.9 to 13vDC. Above 13vDC increases the risk of the final exceeding its 1A current rating. 73, de N4HNH

Thank you for the speedy reply! I committed myself to all VHF SOTA (1st MG) and I have been using my FT818 with a N9TAX Rollup Jpole and when going gets tough the Arrow 3 element Yagi. Out of 130 activations I have come up short 7 times. I am amazed at what 70/2/6m can do with a bit of altitude! That being said I will be relieved to complete this phase of my SOTA journey the setup I have now is 18-20lbs total (with other backcountry gear) . Switching this out for a SW3B and a MTR4b with an end fed/9v battery will cut my weight by 2/3. I am going to order the MTR4B because you can never have enough QRP rigs! After I get a couple dozen activations done with each I’ll make a review comparing them! “73” Erik

My brother, W4KWM, made Mountain Goat using only his HT. I would get my first contacts with the HT as well, though I also worked HF. We use the Diamond SRH770S duckie, N9TAX roll-up J-Pole, and a 3-element piano wire Yagi that my brother designed. It weighs 4 ounces, including the coax and BNC. It attaches to a trekking pole for transport. I encourage you to keep on going and make MG without HF. I didn’t think of it before I had already activated with HF. I think you will like the MTR4B V2. Let us know what you think. 73, de N4HNH

Their other models are blue and white. The newest is red.

Portable Carrying Case Bag for GoPro Camera and Gopro Accessories,Hapurs Durable Travel Carry Protective Case Storage Bag for GoPro Hero 2 3 3+ 4 Hero 4 Session Hero 5 Session and Accessories www.amazon.com/dp/B071FGC12H/ref=cm_sw_r_cp_api_glt_fabc_M0SH1R30328VA3HV1TMH?_encoding=UTF8&psc=1

I wanted 60 instead of 80 but they won’t make it. I do okay with 80 but 60 covers the in between range. 73, de N4HNH

@@n4hnhradio not enough room for that much wire on a lot of summits nor do I get up that early LOL

Well, LNR Precision can only offer you 3 useable bands with the MTR4B V2. I think their 5-band model has 17m. 73, de N4HNH

The antenna I use for portable ops is the NY4G EFHW. Even when I add the 80m link, it is half as long as an 80m dipole. We have a close knit group of SOTA activators here in the Southeast, with chasers who are shut-ins. We get together for cook-outs and camp-outs twice a year. So, we try to always operate either 60 or 80 meters, to give our fellow activators and chasers the opportunity for chase points and S2S bonus. 73, de N4HNH