SF401 Plus 27Mhz-3000Mhz Radio Portable Frequency Counter Meter with CTCCSS DCS Decoder

This is a cheap frequency counter and it works well for what it is, just don't expect it to rival a $500 machine. It picks up everything, I tried it with my FRS radio to map it to use paired with a GMRS radio. It worked great, then I tried on a second radio and it was all over the place. That was until I realized my phone was next to it. Moved my phone away and it was back to working great. You have to be careful and aware of what it around it. Also for picking up tones, you have to hold the TX button for a moment to get the tones. It picks up frequency really quick, tones take another few seconds to read.

It works well but for me its accurate on expensive radios like it reads my Motorola XPR3300 accurate nothing wrong but when I switch over to my cheap Baofeng radios its off by like 5 so instead of reading 456.7689 it reads 456.7684 but its alright

Review of the SF401 Plus.I only need this to use on the 2 meter ham band. I did test this with a Kenwood TH-F6 hand held unit set to 1/2 watt transmit power on 2 meters and this is what I discovered.1) The Ctcss frequencies captured were spot on.2) The frequency counter reading was about .6 mhz low.3) The 'frq offset' adjustment only gave me about +/- 4 hertz, not nearly enough.Conclusions:1)The frequency accuracy claimed is off by 600kc, there is no way to zero the unit effectively.2)The Ctcss decoding is absolutely accurate.The SF401 PLUS worked about as well as I expected and is a useful tool for sniffing out unknown ctcss tones. Its use as a frequency counter might not be so good. Being off .6mhz at 147mhz is worse than advertised but actually is not too bad for a $50 RF tool. The sensitivity seems pretty low. I tried running the 'Rf detect level' up and down, not much of an improvement, with my 1/2 watt transmitter, I needed to have the antennas within about a foot to get a good reading.I would actually recommend this to a friend, after explaining what I have discovered.Enjoy, de K6WGX Oxnard CA

A great Cheap addition to my ham setup

Does what I needed it to do and more right out of the box. We have old radios at work and I needed a new antenna for one. Didn't know if the radios were UHF or VHF. This showed up with enough charge to tell me the frequencies of every channel. Checked multiple radios and got the exact same frequencies on all of them. It was very simple and intuitive to use.

Buen equipo, me gustaria un poco mas de sensibilidad en la deteccion de frecuncia. Como en la mayoria de los equipos chinos el manual ess pobre.

I give this meter a 5 star rating. I was surprised that it did read the CB radio frequencies. I have to key the radio up a couple of times to get the reading but, it will do it. It is a good meter for the money and, since I am a ham radio operator, it will come in handy when I get my dual band 2 meter 440 hand held rig. For the money, this meter is quite satisfactory!

My unit works and properly reports the TX frequency and CTCSS tone, if sending, as indicated in the manual. Attenuation was off and you really need to get the supplied antenna next to the TX antenna to get a reading. Please review my notes below carefully. DMR was the only mode to provide a frequency reading when the meter was set to digital. P25 and C4FM (Yaesu Fusion) could be identified only when set to analog.I tested the following all with correct frequency results:- 10 meter band using analog FM- 6 meter band using analog FM- 2 meter band using analog FM/P25/C4FM- 70 cm band using analog FM/P25/C4FM- 33 cm band using analog FM- 70 cm band using digital DMRI am pleased with the function of this meter and that it charges via USB as well. Still, if your unit appears to not be working after it powers up, you probably do not have the antenna literally next to or touching the TX antenna. I also tested by adjusting the "RF detect level" in the settings and moving it from 5 to 40. It did not appear to make a difference on the close proximity needed of the TX antenna to the meter antenna.