Question about Pyramid (Swr14) Swr&Power Field Strength Meter with Power Switch (10&100 Watts)

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Need frequencies covered by pyramid SWR-14 meter

I don't know if this only works on CB band (27 Mhz) or if it will work also for the 2m band (145 Mhz). Cannot find who makes it.
I think I got this from Radio Shack but they no longer carry this item.

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It appears to be only good for the cb frequencies.... i suspect it would be too unstable for 2 metre usuage


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Posted on Feb 01, 2009

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May be OK for 2 MTR. Will work on 10 MTR. Usualy takes One made for 2 MTR. Another $60 or &80 .
Dale N8SAC "General Class"

Posted on Nov 28, 2011

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According to the "owners manual" (a single sheet) the frequency range is from 1.5MHz to 150MHz. So, you are okay for the 2-meter band. That is, of course, if you can believe the manual!

See for yourself...

Posted on May 13, 2009

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1 Answer

Why does my TS570s does tune antennas on all bands. I check the all antennas SWR ok

if you are trying to check a cb antenna with a ham meter it won't work because the frequencies are not the same.You need a meter that operates in the frequency of the radio and antenna you are checking .Otherwise it will just show what you have stated.

Aug 18, 2015 | Radio Communications

1 Answer

Tabla de frecuencias

CB Radio Channels (FCC)[32] Channel Frequency Channel Frequency Channel Frequency Channel Frequency 1 26.965 MHz 11 27.085 MHz 21 27.215 MHz 31 27.315 MHz 2 26.975 MHz 12 27.105 MHz 22 27.225 MHz 32 27.325 MHz 3 26.985 MHz 13 27.115 MHz 23 27.255 MHz 33 27.335 MHz 4 27.005 MHz 14 27.125 MHz 24 27.235 MHz 34 27.345 MHz 5 27.015 MHz 15 27.135 MHz 25 27.245 MHz 35 27.355 MHz 6 27.025 MHz 16 27.155 MHz 26 27.265 MHz 36 27.365 MHz 7 27.035 MHz 17 27.165 MHz 27 27.275 MHz 37 27.375 MHz 8 27.055 MHz 18 27.175 MHz 28 27.285 MHz 38 27.385 MHz 9 27.065 MHz 19 27.185 MHz 29 27.295 MHz 39 27.395 MHz 10 27.075 MHz 20 27.205 MHz 30 27.305 MHz 40 27.405 MHz

Oct 18, 2013 | Connex 3300 240-Channels Base CB Radio

1 Answer

Will talkabout 250 communicate with cb

No. Your Talkabout T250 operates on FM UHF frequencies between 460-470 MHz. The CB operates on 40 frequencies between 26-27 MHz.

Best regards.

Oct 27, 2012 | Motorola Talkabout FRS 250 (14 Channels)...

2 Answers

Can this SWR be accurately be used for a boat VHF radio antenna? I have tied it and it seem to work but do not know if the reading are good.

Standing wave ratio is standing wave ratio. This meter is not reading based on frequency. It is reading based on the measurement of electrical energy. I see no reason why it wouldn't work.

Jun 22, 2011 | Astatic (PDC7) CB Radio

1 Answer

I want to know the correct method on how to do a SWR test with the Galaxy 959.I have a 5 foot self adjustable firestik and have mounted it to a 4mm thick aluminum plate 30 cm square and will have it higher...

The best way is with an antenna analyzer but that is too expensive unless you do SWRs for a living. The meter on the radio should suffice for your needs.
Adjust the screw on the antenna until it is about 1/2 inch out.
Place the srf/swr switch to swr.
Go to channel 1 and note the SWR reading on the meter.
Go to channel 40 and do the same.
If channel 1 SWR is higher than channel 40, then screw the tuning screw out a turn or 2.
If channel 40 SWR is higher than channel 1, then screw the tuning screw in a turn or 2.
Repeat until the SWR on channel 1 is the same as 40. Channel 19 will be the lowest.

If you are not comfortable using the built in SWR meter, you will have to invest around $20 for a small SWR meter.

,,,,Don at NTCB, Inc.

Jun 04, 2011 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Will the 257 work on 11 meters/cb40 channels?

The Magnum 257 is a 10-meter Amateur radio, but it can be easily modified to operate on the 11-meter CB radio band. The modification and use of this radio on the CB frequencies is, of course, illegal. To modify one of the newer blue-faced models (this will not work on the original yellow-face models), remove the speaker side cover and look for the CPU board in the front of the radio close to the mic connector. This board has four sets of pins and a jumper that fits on the pins. To convert/expand the radio, move the connector to the CON3 position. This will give you frequency coverage from 25.165 to 29.699 MHZ, and the CB frequencies will be on Band E of the radio. Again, this modification, and use of the radio on the CB frequencies, is illegal. This modification information is provided for shop/calibration and experimental use only.

Nov 01, 2010 | Magnum 257 CB Radio

1 Answer

What frequency do these run?? am or fm??

CB or citizen's band is in the 27 MHZ band. Its 40 channels long, AM typically, and on some models side band, or SSB.

It is only legal in the US to have a radio that operates in the 27 MHZ band on the designated 40 channels using AM or single side band only.

The MCB-30 is an AM only radio.

Mar 25, 2010 | Maxon MCB-30 40-Channels Base CB Radio

1 Answer

Please explain a 10 meter am/fm radio


You do set this up like a regular CB. The meters refers to how long the waves are. CB is 11 meters. So its very close. The antenna woud be tuneds slightly shorter. Use the SWR meter in the radio to calibrate just like you would a normal cb.

Now for the ABCDEF knob. each letter is 40 channels in the band. So A would be 1 - 40 channels, then B would be the next 1 - 40 channel frequencies. You use the frequency counter in the radio(providing that model has one) to tell what channel you are on.

Here is some info one the frequencies in the band.

Now for AM and FM. this is the type of modulation you are using for transmit and receive.

CB transmits on AM or SSB. Amplitude modulation or Single side band. Most CB radios only have AM. But some also have SSB. None will have FM.

FM is frequency modulation.

10 meter radios can have AM FM SSB and DSB depending on the model and options it comes with.

So your radio has 6 ranges for freqency. each is 40 or 50 channesl. Not sure what model you have. If it has 40 then you have 240 channel freqencies.

with AM and FM, you double that, because you can talk on AM or FM on all the channels. If you are on AM and some one transmits on FM unless they are really close, you will not hear them at all, but if you do with will just be garbbled noise.

Also Am and FM both work a little different with range etc.

Now, you may be able to talk on the CB channels as well. Cb starts at 26.965 MHz and ends at 27.405 MHz. The channels are all .010 MHz appart.

Hope this helps

Dec 09, 2009 | Radio Communications

1 Answer

When I key the mic the radio blinks out and then comes back on

This can be due to one of several problems. Insufficient sized wires to the power source or a high SWR (standing wave ratio) between transmitter and antenna. The first is probably not a problem unless connected to an RF amplifier to boost output wattage. A high SWR however, is a more likely culprit. SWR is a ratio of power out of the transmitter to power that is reflected back from the antenna. Ideal theoretical ratio or "match" is 1:1. Real life is more like 1.1:1 (one point one to one). Most transmitters are perfectly happy with a match (or mismatch as the case may be) of 1.5:1 or even 2:1. Beyond this is asking for trouble. A mismatched antenna system can cause the failure of the output final transistors.

Matching or lowering the SWR of a radio to an antenna system requires that an SWR meter be installed between the antenna coax or cable and the transmitter's antenna connection point. There are two types of meters - dual needle and single needle. The dual type is more expensive, but easier to work. The meter must be capable of working on the frequency it is to used on. This means if it is marked as a 400 - 512 Mhz or UHF type, it will not be accurate on 27 Mhz or HF.

Once the meter has been installed, transmit at half power (or at least the amount needed by the meter) on the highest frequency and take readings. Do the same at the lowest and a middle frequency and record findings. Physically adjust the length of the antenna whip - by no more than 1/4" inch (for 27MHz CB frequencies) and check again. After a few tries, you should begin to see how shortening or lengthening the whip changes the SWR of the system. Once set correctly, the middle frequency will have the lowest SWR value while the lowest and highest frequencies will have equal higher SWR values. It would go something like this: Ch1 = 1.6:1 Ch 20 = 1.2:1 Ch40= 1.6:1 Of course, if Ch1 = 1.7:1 and Ch 40 = 1.6:1 that would be fine, too.

Double check everything once more at full power, so that you know the transmitter won't be damaged under full power conditions. Make any last adjustments and lock everything in place.

Aug 21, 2009 | Radio Communications

1 Answer

Will it work with a cb radio

No. CB's operate at the 27 MHz on 22 predetermined frequencies allowed for Citizen Band radios; and your Motorola XV1100 radio is a VHF 150-170 MHz radio with a set amount of built in frequencies to choose from, designed for business use.

Aug 20, 2009 | Motorola XV1100 (1 Channel) 2-Way Radio

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