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I would like to run this by the WWRF expertise before I connect everything and break something... Wacom WP-637 Band-Reject Duplexer Two pics attached (before I tuned it) One datasheet One response curve graph 1. I thought I would measure the resistance across the center and outside of...

Thanks heyu.

Are deep-cycle batteries good for backup power for radio gear? I figure going to Checker or Autozone and buying the biggest battery would be the best way to do this. Checker sells a very large $125 "regular" automotive battery and a medium sized $75 marine battery, but rated in "cold cranking...

After +/- 8kHz is the power effectively zero?

Thank you for all of the helpful responses. I will investigate these new words. I have another question, is there something special about 3dB? I understand that it is "half", but is it a common reference for any of these terms? I am wondering if the selectivity specification is +/- 5kHz at...

Yes, exactly what I want to know. I got that part for the signal isolation on the receiver, using this spec for wide fm, RECEIVER Circuit Type: Double-Conversion Superheterodyne Intermediate Frequencies: 21.7 MHz and 450 kHz Sensitivity (12dB SINAD): Better than 0.2uV...

Ah, thanks Captain. That that makes sense. I must be looking for something else then. Do you know what power output vs "carrier" frequency is so I can find that specification?

Most all mobile radios have this specification for the transmitter maximum deviation, +/-5kHz. I want to find out the range of frequencies that a transmitter will cover in addition to the tuned frequency. What information in the datasheets says how much that deviation is at a given power output...

Interesting JandG. I didn't know that, thanks.

If you have it plugged into the car charger, wall wart, or external DC power supply and turn off that power supply (or unplug the power cable) the radio will revert back to the settings it was at before it was turned on (even if a battery is plugged in). You could be noticing that in combination...

The D710 is slightly cheaper. I like the D710, but haven't used the FTM350. I don't know if the D710 will do ARTS stuff. Yaesu FTM-350R FTM350 Mobile Transceiver Kenwood TM-D710A TMD710 APRS Mobile Radio

From my limited experience, a TNC is the modem used to decode APRS data. If you tune to 144.390 you will hear a bunch of the sounds from back in the day when you had to dial up to get connected to the tubes, the TNC decodes those lovely sounds and can give that data to a computer or the...

Skillz, C2, skillz.

Ha! Awesome. I'm going to try that out. Great vid too, very well put together and you present yourself well. Mole can you post a frequency file of the sats you have in the sticky thread for the 8R?

I have a question about who signs where on the club callsign form, here is the page that has a link to the form. ARRLWeb: Instructions for NCVEC Quick-Form 605 Application for Amateur Operator/Primary Station License Specifically There is a professor and student scenario. Would it be...

Can you or do you want to build a repeater there?

How easily is to to remove an antenna after it has been installed? I have a Diamond MR77 Diamond MR77 Dual Band Mobile Antenna and the antenna "wire" could be removed but the mag mount would have to be cut off if someone wanted to steal "the whole antenna". Most other antennas I have looked at...

Green Light Labs GPS-710 Found this, anyone have experience using this or another GPS for the D710? UR doesn't list one specifically, Kenwood TM-D710A TMD710 APRS Mobile Radio. From reading, it seems like a pretty standard GPS. Thanks jm

Indeed Yaesu FT-857D Amateur Transceiver FT857 Yaesu FTM-350R FTM350 Mobile Transceiver FT-350 will be more useful and fun I think. The more bands your antenna can operate on the worse it will perform, compared to fewer band antennas. If you get the FT-857D you will either have to...

Good question. Molecule, from that manual page it looks like the the FT-350 plugs into an external TNC as well as a computer. Do you think it would be happy just connecting its internal TNC to a computer?