Hi,I've been looking at these R/S frequency counters. They don't sellthem anymore at R/S but they do have the documentation on theirwebsite. Anyway, here's a link o one on Ebay with a good descriptionof the frequencies it handles:that it says that you can use it from 1 MHz to 1.3 GHz for RFsignals and 0 Hz to 1 MHz for logic frequencies. Considering the AMband falls under the 1 MHz range is this useful for AM radioapplications or would AM signals not be considered logic signals?I was thinking that they may have only been considering FM as the RFsignals but then again maybe not. Does anyone know if this thing canbe used for AM radio?Thanks again,Dave. Is this useful for AM radioapplications or would AM signals not be considered logic signals?From the description, I would think logic signal means a direct connectionto a 0 to 5V signal (for TTL) and maybe more if used in CMOS circuits.If so, then they are no good for reading RF below 1Mhz.How many digits on that meter?And.is the 1Mhz range a full scale range?Meaning it can read from say 0 to 1 Mhz on that range?SylIIRC the resolution at that frequency is either 1 or 10 Hz. I would have tofind my manual.
Please read before using this equipment. 22-306 OWNER’S MANUAL.:19 PM. 2 FEATURES Your RadioShack LCD RF Frequency Counter is a mi-crocomputer-based instrument that accurately mea-sures radio frequency (RF) or logic frequency signals. It is ideal for the home electronic hobbyist or a small re. RadioShack is a registered. Jhww,qjývwduwhgýz,wkýg,.,7doýorj,fý ýýýýýý&20%,1$7,21$/ý/2.,&ýýýýýýýýýýýýýýýý ýýýýýý ýýýýýýýýýýý ýýýýýý.
If you don’t find the Snap Circuits product manual you’re looking for, email the product name and model number to support@elenco.com. Looking for a list of Products that have a French – English Manual?
I have one of those meters, loved it, but dropped a can ofcorn on the display a couple months ago.:(. Loved it, but dropped a can of corn on the display a couple monthsago.:(How did you do that?
Were you measuring the frequency of the corn popping?Our apartment is actually two apartments. The kitchen area of the otherside is my workbench area. However, we store canned goods in the cupboardsin there, and while stocking one day, a can of corn fell from the shelf.landing right on the display of my unfortunate frequency counter. At thetime I was unable to find another like it on ebay, so ended up buying adifferent brand, which actually is a nicer counter, in that it has a levelmeter, multiple gate speeds and registers, IIRC, to 3 GHz. ?Our apartment is actually two apartments. The kitchen area of the otherside is my workbench area.
However, we store canned goods in the cupboardsin there, and while stocking one day, a can of corn fell from the shelf.landing right on the display of my unfortunate frequency counter. At thetime I was unable to find another like it on ebay, so ended up buying adifferent brand, which actually is a nicer counter, in that it has a levelmeter, multiple gate speeds and registers, IIRC, to 3 GHz.By way of explanation, Korean apartments are tiny by American standards.Many American's living rooms (and some of their bedrooms) are larger than awhole Korean apartment. When we got the opportunity to expand into the nextdoor apartment for a total of 900,000 Won (about $750 US), we took it. Thelandlady is an old family friend, and she even paid to have a hole put inthe wall between the two apartments for us.As a side benefit, this also helped lower our electric bill.
This isbecause of a graduated scale fee for electric power. Expanding into theother apartment, we use the same amount of electricity that we used to, butnow each half of the apartment is about two levels lower on the scale. Makesa difference between (in summer, using AC) a $1200 power bill and a $700power bill. (and you folks in NYC think you have it bad.:) ). Makesa difference between (in summer, using AC) a $1200 power bill and a $700power bill. (and you folks in NYC think you have it bad.:) )I hope those are not monthly bills?SylYeppers, they sure are.
But they're only that bad during the hot part ofthe summer. In the winter they're closer to about $400 a month, give ortake. I'll spell it out for those who are curious.0-100 Kwh 370 Won/Kwh (34 cents)101-200 Kwh 810 Won/Kwh (77 cents)201-300 Kwh 1, 390 Won/Kwh ($1.14)301-400 Kwh 3,330 Won/Kwh ($3.10)401-500 Kwh 6,240 Won/Kwh ($6.00)Over 501 Kwh 11,440 Won/Kwh ($11.10)Remember these costs are PER Kilowatt Hour!!! Now, who's going to gripeabout their 14 cents/Kwh basic electricity billing??? (some places may beslightly higher, some are lower).This means that during a month when we use only 500 Kwh, our electricitycost is (at the current exchange rate of 1180 Won/Dollar) $1,028.81. Canyou say OUCHIES???I can indeed.Crikey!That's 2/3 of my monthly salary.Just received my bill.I used a total of 599kWh over the last 3 months, at a total cost of 45.55pounds sterling(about 70 dollars?) There is a standing charge of 8.04p/day and it is5.86p/kWh,both plus 5% V.A.T.Martin(Stockport). In there, and while stocking one day, a can of corn fell from the shelf.landing right on the display of my unfortunate frequency counter.Ouch.LCD displays.Not much you can do to fix those.No kidding.
I'd bought a very nice HP Office Jet FAX, copier,scanner and printer combo for $12. Then I paid HP about $65for the manual and assorted missing bits.
And of course, thecost of an ink cartridge. About 6 months later, I was puttingaway some Motorola high capacity NiCads for my cell phone anddropped one dead center on the damn display.
Not a happy camper.Jeff. Hi,I've been looking at these R/S frequency counters.
They don't sellthem anymore at R/S but they do have the documentation on theirwebsite. Anyway, here's a link o one on Ebay with a good descriptionthat it says that you can use it from 1 MHz to 1.3 GHz for RFsignals and 0 Hz to 1 MHz for logic frequencies. Considering the AMband falls under the 1 MHz range is this useful for AM radioapplications or would AM signals not be considered logic signals?I was thinking that they may have only been considering FM as the RFsignals but then again maybe not. Does anyone know if this thing canbe used for AM radio?Thanks again,DaveThe actual digital counter would work down to zero. At the upper range,the speed of the counters come into play, and they may not be fastenough to count at higher frequencies. (Or, there wouldn't be enoughdigits, and you'd get overflow.)The low end you quote then is the frequency limitations of theanalog amplifier inside the counter that goes between the input andthe section that converts it to a square wave. Like any AC amplifier,it has frequency limitations.
In this case, it would seem the designerdeliberately rolled off the frequency response below 1MHz. But likeany amplifier, it will still work but with reduced gain.
So sensitivitywill likely be lower below 1MHz (but, you don't quote actual specs,so one can't tell if it will be relatively minor drop in sensitivity,or major).That bit about 'logic frequencies' almost sounds like a separateinput, and one that is DC coupled so it can run down to zero. With noAC coupling, it can do that, but it's also open to any DC on the circuityou connect it to. So this hints, especially with the 'logic' bit,that this input expects logic levels, not going above +5volts andnot below 0volts. If so, it must explain which logic family, sincethat changes the actual switching point.
Logic levels are fairly welldefined, so they can risk the logic ICs when connected directly. Ofcourse, they risk someone connected the counter wrong.If this assumption is correct, this logic input will require a relativelystrong signal, since it will have to be high enough to trigger the logicinput, something on the order of 2.4volts or so.On the other hand, if this assumption is correct, you could look upa frequency counter circuit in any number of books or magazines, findingone that has an input amplifier good down to audio (but AC coupled),and copy it.
Feed the output into a schmitt trigger of some sort,and then it's output into this 'logic input'. This will give youthe low frequency response, but also the needed sensitivity.But before you go that route, you'd want to see just how muchthe input sensitivity drops at lower frequencies on the regularinput.Michael. Hi,I've been looking at these R/S frequency counters. They don't sellthem anymore at R/S but they do have the documentation on theirwebsite. Anyway, here's a link o one on Ebay with a good descriptionthat it says that you can use it from 1 MHz to 1.3 GHz for RFsignals and 0 Hz to 1 MHz for logic frequencies.
Considering the AMband falls under the 1 MHz range is this useful for AM radioapplications or would AM signals not be considered logic signals?I was thinking that they may have only been considering FM as the RFsignals but then again maybe not. Resident evil 3 ps1 rom. Does anyone know if this thing canbe used for AM radio?Thanks again,DaveThe actual digital counter would work down to zero. At the upper range,the speed of the counters come into play, and they may not be fastenough to count at higher frequencies.
Radio Shack Scanner Manuals
(Or, there wouldn't be enoughdigits, and you'd get overflow.)The low end you quote then is the frequency limitations of theanalog amplifier inside the counter that goes between the input andthe section that converts it to a square wave. Like any AC amplifier,it has frequency limitations.
In this case, it would seem the designerdeliberately rolled off the frequency response below 1MHz. But likeany amplifier, it will still work but with reduced gain. So sensitivitywill likely be lower below 1MHz (but, you don't quote actual specs,so one can't tell if it will be relatively minor drop in sensitivity,or major).That bit about 'logic frequencies' almost sounds like a separateinput, and one that is DC coupled so it can run down to zero. With noAC coupling, it can do that, but it's also open to any DC on the circuityou connect it to. So this hints, especially with the 'logic' bit,that this input expects logic levels, not going above +5volts andnot below 0volts. If so, it must explain which logic family, sincethat changes the actual switching point.
Logic levels are fairly welldefined, so they can risk the logic ICs when connected directly. Ofcourse, they risk someone connected the counter wrong.If this assumption is correct, this logic input will require a relativelystrong signal, since it will have to be high enough to trigger the logicinput, something on the order of 2.4volts or so.On the other hand, if this assumption is correct, you could look upa frequency counter circuit in any number of books or magazines, findingone that has an input amplifier good down to audio (but AC coupled),and copy it. Feed the output into a schmitt trigger of some sort,and then it's output into this 'logic input'. This will give youthe low frequency response, but also the needed sensitivity.But before you go that route, you'd want to see just how muchthe input sensitivity drops at lower frequencies on the regularinput.MichaelJust for grins, you might note that the machine was designed for trackingVHF/UHF bug transmitter freqs, capturing police freqs & ham hobbies.
Responseat AM broadcast frequencies was not a desired feature of the unit, so theyapplied whatever skill they had to rejecting that. Being Radio Shack, you canjudge how well that was accomplished.Neutrodyne. Hi,I've been looking at these R/S frequency counters. They don't sellthem anymore at R/S but they do have the documentation on theirwebsite. Anyway, here's a link o one on Ebay with a good descriptionthat it says that you can use it from 1 MHz to 1.3 GHz for RFsignals and 0 Hz to 1 MHz for logic frequencies. Considering the AMband falls under the 1 MHz range is this useful for AM radioapplications or would AM signals not be considered logic signals?I was thinking that they may have only been considering FM as the RFsignals but then again maybe not. Does anyone know if this thing canbe used for AM radio?Thanks again,DaveYes, I have one.
It is ok for AM. RF is RF to a freq. Acarrier registers in frequency on the FC. AM will vary somewhat in frequencyif modulation is applied.
Radio Shack Digital Logic Probe Manual
FM normally will not. The counter you speak of hasan audio scale of 0-10 MHz. The prior model didn't. Short answer, the meter does work on AMBCB frequencies, but don't expect itto be able to read your local oscillator worth beans. You'd have todirectly connect it, and that would draw the frequency of the LO down.Actually the Radio Shack counter will measure the local oscillatorquite well with the antenna held an inch or more from the oscillatorcoil or the oscillator section of the tuning capacitor.
Radio Shack Pro 50 Scanner Manual
No directconnection required. Mine is the R/S Cat. 22-306, but the 22-305works about as well. Those counters are a big help in aligningreceivers.Best Regards,Ed EngelkenCanyon Lake, TX. Short answer, the meter does work on AMBCB frequencies, but don't expect itto be able to read your local oscillator worth beans. You'd have todirectly connect it, and that would draw the frequency of the LO down.Actually the Radio Shack counter will measure the local oscillatorquite well with the antenna held an inch or more from the oscillatorcoil or the oscillator section of the tuning capacitor. No directconnection required.
Mine is the R/S Cat. 22-306, but the 22-305works about as well. Those counters are a big help in aligningreceivers.Best Regards,Ed EngelkenCanyon Lake, TXThat brings up the issue of input impedance. When frequencycounters were common construction articles in the magazines, the normwas to have a low frequency input, ie through the HF range, thathad a relatively high input impedance. But then to get higher coverage,a prescaler was put inline, between a separate input and the rest ofthe counter. These tended to be 50ohm input. It almost sounds likethis Radio Shack counter has a 50ohm input, based on someone else'scomment about it's intended use, and the fact that you speak in termsof 'antenna near the oscillator' rather than probe connected to theoscillator.Micahel.
That brings up the issue of input impedance. When frequencycounters were common construction articles in the magazines, the normwas to have a low frequency input, ie through the HF range, thathad a relatively high input impedance.
But then to get higher coverage,a prescaler was put inline, between a separate input and the rest ofthe counter. These tended to be 50ohm input. It almost sounds likethis Radio Shack counter has a 50ohm input, based on someone else'scomment about it's intended use, and the fact that you speak in termsof 'antenna near the oscillator' rather than probe connected to theoscillator.The Radio Shack counter has selectable input impedance: either 50ohms, or HiZ.Both the 50 ohm and HiZ works on the 1-50MHz and 50MHz-1.3GHz ranges.The 0-10 MHz range is for TTL logic inputs. There is no mention as tojust how 'high' the HiZ input is, but the dynamic range for RFmeasurements is rated at 10 mv to 1 V RMS.
The counter easily picks upthe local oscillator in tube operated receivers with the antenna (Iuse short piece of hookup wire) located several inches from theoscillator coil. You have to get the antenna within an inch or so for9-volt operated transistor sets. I have used it to check the LO in BCband, SW band, and FM sets. It's accuracy is much better than theaverage EICO or Heathkit signal generator!If you are interested, the instruction manual and specs for the RadioShack counter model 220-0306 are available on the Radio Shack website.EdCanyon Lake, TX. Short answer, the meter does work on AMBCB frequencies, but don't expect itto be able to read your local oscillator worth beans. You'd have todirectly connect it, and that would draw the frequency of the LO down.Actually the Radio Shack counter will measure the local oscillatorquite well with the antenna held an inch or more from the oscillatorcoil or the oscillator section of the tuning capacitor. No directconnection required.
Mine is the R/S Cat. 22-306, but the 22-305works about as well.
Those counters are a big help in aligningreceivers.Best Regards,Ed EngelkenCanyon Lake, TXThat brings up the issue of input impedance. When frequencycounters were common construction articles in the magazines, the normwas to have a low frequency input, ie through the HF range, thathad a relatively high input impedance.
But then to get higher coverage,a prescaler was put inline, between a separate input and the rest ofthe counter. These tended to be 50ohm input. It almost sounds likethis Radio Shack counter has a 50ohm input, based on someone else'scomment about it's intended use, and the fact that you speak in termsof 'antenna near the oscillator' rather than probe connected to theoscillator.MicahelIt's also pretty easy to make up a simple active probe using a MPF102or similar RF fet as a source follower-that will provide the neededimpedance matching and some power gain to boot.Pete.