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Everything posted by Lscott
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- repeaters
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Digital Voice Mode on GMRS - Possible Rules?
Lscott replied to Lscott's topic in FCC Rules Discussion
Some said the same thing with FM on 11M CB. Well it happened. I think it all depends on how it's proposed to the FCC. If it's too disruptive or requires the FCC to make major significant changes to the rules it likely won't happen. I did post, 7/25, in this thread a while back some ideas on how it could be done, in a downloadable file (GMRS Digital Voice - 20220803.pdf) since it's rather long, what the FCC is likely to consider. -
Garmin went and made murs spendy,,but pretty cool maybe
Lscott replied to Craws907's topic in Multi-Use Radio Service (MURS)
There aren't many radios specifically manufactured for MURS. There are some nice used Part 90 radios that will work just fine with the "proper" programming. If the radio was certified before 2002 I believe it can be used, grandfathered, so long as all of the technical requirements are met, power, frequency and bandwidth. I think radios like the following qualify. TK-270G, FCC ID ALH29463110, Grant 1999 https://www.manasrekha.com/pdf/TK-270G-370G.pdf TK-2140, FCC ID ALH32253110, Grant 2001 http://www.swscomm.com/kenwood/TK-2140_3140.pdf Unfortunately the radios are only switchable between 5W and 1W so to be strictly legal the power would have to be set at 1 watt. It might be possible to adjust them to 2 watts on the low setting. Oh, these radios make nice 2M radios once programmed for local repeaters too. -
One of my TK-5320 UHF P25 radios. Uses the same case style as the NX-200/300 NXDN radios. Makes them hard to tell apart without looking at the model tags on the back side. I also have the VHF version too. The 450 MHz to 520 MHz band split models have Part 95 certification so they can be used on GMRS FM mode only. Detailed spec's: https://comms.kenwood.com/common/pdf/download/TK-5220_5320_Specsheet.pdf
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From the album: Misc. Radio Gear
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From the album: Misc. Radio Gear
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From the album: Misc. Radio Gear
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2117323252_BatteryPackTesting.JPG
Lscott commented on Lscott's gallery image in Members Albums Category
Battery pack testing using a lab grade electronic load. Battery pack is discharged using constant current mode. Rate is set at 0.2 times the rated battery pack capacity. This is one of the typical rates used for capacity rating by manufacturers. The Kenwood Lithium Ion battery packs have a rated output voltage of 7.2/7.4 VDC. There is a protection circuit in them, over charge and over discharge, which shuts the pack down if the charge voltage goes too high or discharge voltage too low, around 5.7 VDC more or less. The HT's typically will alarm out/shut down around 6 VDC so that's my discharge cutoff voltage. Data sheet: https://siglentna.com//wp-content/uploads/dlm_uploads/2019/04/SDL1000X_DataSheet_DS0801X-E01E.pdf -
This is one of the NX-300 400-470 band split radios. Just got it back from service and testing it out at the office by letting it scan. The 450 MHz to 520 MHz band split models have Part 95 certification so they can be used on GMRS FM mode only. I also have the NX-200 VHF versions too. This radio is easily setup for railroad monitoring if you are into that. The railroads use either FM or NXDN digital so the NX-200 is perfect for that. These are very nice radios. Detailed spec's: https://comms.kenwood.com/common/pdf/download/02_NX-200G&300GBrochure.pdf Depending on the generation of the radio they can be reprogrammed over the air remotely. You just need the master base radio connected to a computer running the application. For these radios the KPG-150AP package is required. https://comms.kenwood.com/common/pdf/download/905_KPG-150APBrochure.pdf
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From the album: Misc. Radio Gear
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From the album: Misc. Radio Gear
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I collect mainly Kenwood HT's. I have a few Motorola, ICOM and various Chinese ones too. Some of the models I own several units of them, multiple units per box and several boxes for the larger numbers. The storage boxes are sorted by model type. The model type is written on the end of the plastic storage box using a black Sharpie pen. Many of the radios are UHF since that seems to be where the majority of the Ham digital voice activity is found. Not so much on VHF. In any case I do like to get both the UHF and VHF versions on the various models. I'm currently looking for a good deal on a few Kenwood NX-1200DUK2 radios in like new, or new, condition to add to my collection. I recently picked up an Air Band radio, an ICOM IC-A16. While some VHF radios have air band receive a special purpose radio would also include the transmit function too. Air band radios are AM only, so this one is rather unique in my collection. I also just recently purchased some ICOM radios that do FM and dPMR digital, not to be confused with DMR, for the VHF and UHF bands. One of the dMPR radios was converted to NXDN by a repair center by accident when I sent it in for some repair work. They can't get the dPMR firmware from ICOM so they had to refund the cost of the repair. I used that money to purchase another dPMR radio of the same exact model from the same seller. I wanted at least two dPMR radios, UHF, that could talk to each other in digital mode to experiment with them. I now have radios for the following digital modes: D-Star, DMR, P25, NXDN and dPMR. Nothing for System Fusion yet. Not really sure if I want to get one since that mode is specific to Yaesu radios. All the other digital modes are available from multiple manufactures. I was hoping to program the dPMR radios for dPMR446, BUT there are some differences between dPMR446 and dPMR that seems to render the two modes incompatible. This is based on my reading for the two ETSI standards. Looks like I might have to pay up and get an official dPMR446 radio even if they're limited to only 0.5 watts. I would like to get a Kenwood TK-3701D in that case. The radio appears to be based on the NX-1300 series radio. That means I likely can modify the radio and replace the crummy fixed antenna with a removable one by replacing the fixed antenna with the original design SMA socket the regular NX-1300's use. Then using the external antenna port I can use an external power amplifier to boost the power up to around 4 to 5 watts, more like a regular HT. I have a spreadsheet I put together so I can remember which programming software is used for which radio. I also have separate folders for each radio model, and sub folders if more than one band split is available, for the code plugs for each one. When I receive a used radio I try to save the original code plug. Part of the fun collecting these is trying to figure out who, or where, they were originally owned by or came from. One I figured out was used by the maintenance staff at a nuclear power station on the east coast. Fairly current list of models I have: Tri Band: TH-D74A VHF/UHF tri-band analog/D-Star Digital (MARS/CAP mod) UV-5X3 VHF/UHF tri-band TH-350 VHF/UHF tri-band 128 channel Dual Band: TH-G71A VHF/UHF 200 channel (MARS/CAP mod) TH-G71A VHF/UHF 200 channel (No mod's) TH-79A VHF/UHF 80 channels xband repeat built in UV-5R VHF/UHF 128 channel D878UV VHF/UHF 4000 channel analog/DMR Digital KG-UVD1P VHF/UHF 128 channel Multi Band: FT817 HF/VHF/UHF (MARS/CAP mod) VHF: TK-270G-1 VHF 128 channel TK-2000 VHF 16 channel (International Version) TK-2170-K VHF 128 channel TK-2140-1 250 channel (European Version) TK-2140 US version 250 channel TK-2160 VHF 16 channel TK-2360 VHF 16 channel TK-2180 VHF 512 channel TK-D200E VHF 512 Channel analog/DMR Digital TK-D200EG VHF 512 Channel analog/DMR Digital NX-200 VHF 512 channel analog/NXDN Digital NX-200G VHF 512 channel analog/NXDN Digital NX-1200DVK2 VHF 260 channel analog/DMR Digital XPR6550 VHF 1000 Channel analog/DMR Digital TK-5220-K VHF 512 channel analog/P25 Digital IC-F3162DT VHF 512 channel analog/dPMR Digital UHF: TK-370-1 UHF 32 channel TK-370G-1 UHF 128 channel BF-888S UHF 16 channel TK-3170-E UHF 128 channel (European Version) TK-3170-K UHF 128 channel TK-3212L UHF 128 channel TK-3212 UHF 128 channel TK-3173-K UHF 128 channel TK-3160-1 UHF 16 channel TK-3200 UHF 2 channel TK-3360-1 UHF 16 channel TK-3140 UHF 250 channel TK-3180-1 UHF 512 channel TK-3180-2 UHF 512 channel NX-300-K2 UHF 512 channel analog/NXDN Digital NX-300G-K UHF 512 channel analog/NXDN Digital NX-300G-K2 UHF 512 channel analog/NXDN Digital NX-320-K5 UHF 260 channel analog/NXDN Digital NX-320-K2 UHF 260 channel analog/NXDN Digital NX-1300DUK5 UHF 260 channel analog/DMR Digital NX-411 UHF 512 channel analog/NXDN Digital TK-D340U-K UHF 32 Channel analog/DMR Digital TK-D340U-K2 UHF 32 Channel analog/DMR Digital TK-D300E UHF 512 Channel analog/DMR Digital TK-5320-K2 UHF 512 channel analog/P25 Digital XPR6550 UHF1 1000 channel analog/DMR Digital XPR6580 UHF 1000 channel analog/DMR Digital IC-F4162DT UHF 512 channel analog/dPMR Digital T5720 (Motorola FRS Radio) Charger Collection: These are the base units. I don't have the 120 VAC power supply for all of them. KSC-25L KSC-25 KSC-25 (Chinese Clone mod'ed with Anderson Power Pole Input) KSC-16 KSC-23 KSC-35S KSC-32 KSC-32 (Chinese Clone) KSC-30 KSC-31 Impress Motorola EC1 BC-160 Various chargers for specific Chinese and non Chinese Ham radios.
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From the album: Misc. Radio Gear
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From the album: Misc. Radio Gear
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Yeah, for that purpose it's likely just fine.
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That's all nice but do you have anyway to at least calibrate the clocks in the frequency counter and NVA's? Some use cheap crystals as the time base and can be seriously in error or show large drifts over time and temperature. I have a used Rubidium atomic clock, haven't used it yet since it was pulled from an old cell site and I don't know how much life is left on the Rubidium lamp. What I do use is a GPSDO to calibrate the frequency counters against. They aren't horribly expensive. When I got mine I paid about $150 before taxes and shipping.
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Good reason NOT to go to your door. That's really scary stuff.
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Digital Voice Mode on GMRS - Possible Rules?
Lscott replied to Lscott's topic in FCC Rules Discussion
That will be one of the issues with trying to get the FCC to approve the idea. There is an existing group of FM only users and how would allowing digital affect them? Many, I would guess, likely wouldn't have any need or interest in getting digital enabled radios. The current FM only radios fits their needs as is. The FCC would need to balance any proposed rule changes against the interest of those users. That will be the tricky part. -
Do you have the service manual for the radios? Manufactures can and do change versions because of hardware design changes. That could apply to the display too. You simply might have a different, electrically, LCD display verses the other radio where they are not compatible. The service manual might show the differences.
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Digital Voice Mode on GMRS - Possible Rules?
Lscott replied to Lscott's topic in FCC Rules Discussion
Some of the above sounds like a rehash of topics discussed before. I'm surprised more haven't downloaded a file I posted on 7/25, 3 so far and I was one of them to test it, in this thread detailing my thoughts on the topic along with a lot of links to prior background material. In there I go over some points where a couple of modes might be a good choice even if they are not the current favorite and why. The idea is what could be proposed in a filling with the FCC they will seriously consider. Before that happens there has to be sound arguments why it can and should be done. -
Digital Voice Mode on GMRS - Possible Rules?
Lscott replied to Lscott's topic in FCC Rules Discussion
I wouldn't be concerned about FRS. It's a different service, and effectively unlicensed at that. If an FRS user wants to use digital voice, well let them pay for a license. It's another perk of getting licensed besides using higher power and access to repeater operation. The repeater idea has merit. I believe that dual mode equipment is available, which will automatically switch between analog and digital modes. The negative aspect is too many non-technical GMRS users have trouble figuring out what offsets and tones are judging by the frequent posts on the forum asking for help. Now throw in color codes, slots, talk-groups and user ID's, well even some experienced radio buffs have a bit of a problem with those.