Micronta swr meter 21-525b - Pyramid (Swr14) Swr&Power Field Strength Meter with Power Switch (10&100 Watts)

SWR Meter operation is fairly simple. The manual for SWR-3 is here with instructions and schematic.

https://www.opekantenna.com/proimages/SWR-3.pdf

Videos as well
https://www.google.com/search?q=vanco+meter+swr-2+manual

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Did you check the radio shack web site? Google?

They are fairly straight forward to use. The dial is for selecting what you are metering. AC or DC voltage and range. Resistance. Amps. The probes may need to be plugged in differently depending on the meter function.

micronta power meter

The SWR cannot be changed by rotating this knob. The SWR function allows you to determine the SWR or "match" of the antenna system and transmitter on a specific channel. The entire process must be performed whenever you want to know what the SWR is on a different channel. The SWR/CAL button toggles the meter between the CALIBRATE and SWR modes.
Set the radio to CH1. Press the SWR/CAL button. The radio CAL(ibrate) mode is now selected. Press and hold the mic PTT (or push to talk) button. Rotate the SWR knob as needed to adjust the meter indicator until it is on the SET mark on the dial. The meter is now calibrated for this channel.

While still holding down the mic PTT, press and release the S/RF SWR CAL button to the SWR setting to read the SWR on the meter.



This entire process should be done for Ch 20 and Ch 40. You must go through the CAL procedure for EACH channel before attempting to read the SWR.


Changing the SWR requires that the antenna be lengthened or shortened until such time that the SWR can be reduced no further. Typical SWR across the band may be:


CH1 - 1.5:1, CH20 - 1.1:1, CH40 1.5:1


or


CH1 - 2.2:1, CH20 - 1.7:1, CH40 2.3:1


The "dip" in SWR on CH20 is typical, as the antenna is the perfect length on only one channel - it will be come slightly too long or slightly too short as you tune up or down from CH20. The further away from CH20 you go, the poorer the SWR will be. You can "slide" the dip to any channel you prefer - say CH8. If you tune for lowest SWR on CH8, You might see CH1 with a 1.2:1 SWR, CH8 at 1.1:1 SWR and CH40 at 2.5:1. All are acceptable - sort of. Many manufacturers say up to 2.5:1 or even 3.0:1 matches are ok, There's no reason a quality antenna can't be tuned for optimum SWR in the middle of the band (CH20) to have less than a 2.0:1 SWR on CH1 or CH40, unless there is a ground issues or bad cable / antenna / connection somewhere.


You can view the manual here. I hope this helps & good luck!

The meter will be more accurate and an external meter will be even better. If they show good disregard the ant light it is adjustable. It may have been set to sensitive from factory. These erroneous SWR reading can be the side effects of a PEAK & TUNE if the coils have been spread but that should also show on meter.
SWR meter calibrations

• Switch (S/RF SWR CAL) to the CAL position.
• Push and hold mic button
• While holding mic button adjust the SWR CAL knob so the meter needle swings to the CAL mark on the meter
• While still holding down the mic button, set the (S/RF SWR CAL) switch to the SWR position, to read the SWR reading. Note: When switched to SWR position the meter needle should ideally be as far to the left as possible. Anything over 3 is not acceptable.

It should, most any Strength/Signal Wave Ratio tester works with most any radio. But then again, Marine radios are always trustworthy, a study shows that they are the best form of emergency communication. Why would you need to test it?

An SWR meter is used to see how well your antenna is matched to your transmitter output, just like using the correct speakers with an amplifier.

There are usually two readings. FORWARD and REFLECT
or FWD and REFL

Firstly, make sure the antenna selector is in the correct position and set for the antenna you are using.

Next, switch your meter to FWD (FORWARD). Switch your transmitter to low power and press the microphone key.

Next, adjust the CAL knob for the maximum power reading, but not so far that the meter exceeds maximum!

Keep the microphone key pressed and switch to REFL (REFLECT). If your antenna is matched, the meter should now give a low reading. If the reading is very high, you must match your antenna by making adjustments or by using a matching unit.

A poor match will mean a poor signal. A very poor match can damage your transmitter and cause interference.

When you have a good FORWARD reading and a low REFLECT reading, your system will be reasonably matched and you can then use higher power. Remember that you will need to reduce the CAL knob to a lower setting when running high power.

No problem, Follow the link http://support.radioshack.com/productinfo/DocumentResults.asp?sku_id=21-525&Name=CB%20Accessories&Reuse=N It's off to the right under other documents. Good Luck and hope this helps L8R