Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- Repeater-Builder
- Messages
Search
|
Re: Motorola speaker identification
Looks like one use for the NSN6048A was for a convertacom installation.? From:[email protected] <[email protected]> on behalf of Glenn Little <glennmaillist@...> Sent:?Thursday, March 13, 2025 9:04:44 AM To:[email protected] <[email protected]> Subject:?[repeater-builder] Motorola speaker identification Can anyone tell me what radio NSN6048A was used with? Thanks Glenn WB4UIV -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license" |
|
Re: Motorola speaker identification
It a 3 ohm motorcycle spkr.? Do a YouTube search for a video. From:[email protected] <[email protected]> on behalf of Glenn Little <glennmaillist@...> Sent:?Thursday, March 13, 2025 9:04:44 AM To:[email protected] <[email protected]> Subject:?[repeater-builder] Motorola speaker identification Can anyone tell me what radio NSN6048A was used with? Thanks Glenn WB4UIV -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license" |
|
Motorola speaker identification
Can anyone tell me what radio NSN6048A was used with?
Thanks Glenn WB4UIV -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license" |
|
Re: Running a Repeater on a FM Broadcast Tower
开云体育Depending on your preferences… “best practices” are always open to interpretation. While there may not be any other 400MHz UHF gear on the tower today, that might not be the case tomorrow. I get mildly amused when something new shows up on a tower and other repeater owners suddenly have an issue they have to mitigate, that might take them months. Is an IM panel and rx filtering really overkill? ? Sometimes a simple stub may be placed to dump the broadcast (this has been covered recently on the list.) ? I run isolators on all my gear, which of course has a low pass on the tx side, and on the rx I almost always have a band pass. ? Matt AL0R ? From: [email protected] <[email protected]> On Behalf Of steven harvey via groups.io ? Hello Group, ? I'm in the investigation stage of relocating a repeater to a FM broadcast tower site.??? I've been on several LMR towers and not had any issues but wanted to see if there is any best practices I could learn from on what equipment should be mandatory for being on a FM broadcast tower site.??? I have listed what I have so far.? Any additional equipment please ? 1. The repeater will be on the UHF spectrum of the ham radio side. 2. It will be running a Kenwood NXR-1800K2 repeater with TXRX duplexers with a 100DB isolation between sides. 3.? Height will be between 350 to 400 ft 5. Cable is 1 5/8" hard line that was run but never used and capped off. 4. Antenna will be a commander technologies fiberglass antenna being side mounted on the tower with polyphaser lightening protection attached and grounded. 4a.? Jumpers will be 1/2 hardline between the antenna and 1 5/8" and the same going into the building. 5.? The radio station broadcast on 93.7 a with a ERP of 37,000 Watts and there antenna is at the 550ft mark. 6.? There only two 800Mhz commercial antenna's on the tower and a couple of Wifi provider dishes.?? I'll be above all of that equipment. ? Thanks! Steven H. N8RLW |
|
Re: Running a Repeater on a FM Broadcast Tower
You might consider adding an isolator to your uHF system between the TX output and cavities. Chances are you are not going to encounter any issues. I have had numerous 2m and 440 repeaters on broadcast towers for several years without any issue. Recently I did run into a problem with a 2-meter machine, but the ERP of the radio stations was much higher. We were dealing with three FM's combined onto a single antenna with a combined ERP close to 100kW. I had to install a FM trap on the repeater feedline to reduce the amount of RF getting into the system from the FM stations. We have about 250ft vertical separation between the broadcast array and the repeater antenna. Sounds like you are going to have a great system! 73, Kevin, K9HX On Thu, Mar 13, 2025 at 10:50?AM Chris Boone WB5ITT via <setxtelecom=[email protected]> wrote:
|
|
Re: Tektronix Y400 vs Anritsu Cell Master
I have an Anritsu Cell Master, model 8212B I think. It’s sweep rate it way too slow in transmission measurement mode to be useful for tuning duplexers or filters, you have to tweak, wait for the trace, overcompensate, wait, undo what you did, wait, tweak again, wait…. Its fine and accurate for verifying something but that’s it.
?
I got mine off eBay for $350 and it’s been good for the spectrum analyzer to 4GHz, although its sweep is slow and for testing antennas and measuring low power levels. Mine has a bunch of defunct cell phone testing modes and a guy on another four un who worked at a cell phone company turned me on the the eBay ads from his company that was disposing of the units cheap. Knowing what I know now about these I would not pay any more for one.?
I have no experience with the Y400.? |
|
Re: Running a Repeater on a FM Broadcast Tower
No problem....Ive have repeaters on broadcast towers for decades...VHF, UHF ...TV and FM... you're good On Thu, Mar 13, 2025, 9:48 AM steven harvey via <sharvey=[email protected]> wrote:
|
|
Running a Repeater on a FM Broadcast Tower
Hello Group,
?
I'm in the investigation stage of relocating a repeater to a FM broadcast tower site.??? I've been on several LMR towers and not had any issues but wanted to see if there is any best practices I could learn from on what equipment should be mandatory for being on a FM broadcast tower site.??? I have listed what I have so far.? Any additional equipment please
?
1. The repeater will be on the UHF spectrum of the ham radio side.
2. It will be running a Kenwood NXR-1800K2 repeater with TXRX duplexers with a 100DB isolation between sides.
3.? Height will be between 350 to 400 ft
5. Cable is 1 5/8" hard line that was run but never used and capped off.
4. Antenna will be a commander technologies fiberglass antenna being side mounted on the tower with polyphaser lightening protection attached and grounded.
4a.? Jumpers will be 1/2 hardline between the antenna and 1 5/8" and the same going into the building.
5.? The radio station broadcast on 93.7 a with a ERP of 37,000 Watts and there antenna is at the 550ft mark.
6.? There only two 800Mhz commercial antenna's on the tower and a couple of Wifi provider dishes.?? I'll be above all of that equipment.
?
Thanks!
Steven H.
N8RLW |
|
Re: MTR2000 PL Decode question
All,
toggle quoted message
Show quoted text
To let everyone know what I figured out (and aid others), there are TWO places you have to set the radio to full duplex if you have a wireline card installed, there's the settings on station config *AND* on the wireline config.? It will do exactly as it was doing if the radio is set to full duplex but wireline is set to half duplex. Thanks --Don On 3/11/25 18:43, Don Wisdom KD7WKF via groups.io wrote:
Sure, Ill email it too you directly now however its not working again :( |
|
Re: Tektronix Y400 vs Anritsu Cell Master
I've been curious about the Tektronix Nettek Y400 Portable Communications Test set showing up on eBay. The prices are attractive, but it looks like you have to be careful about what plug-in modules you get with it. I don't know if they would be suitable for typical ham repeater use.
toggle quoted message
Show quoted text
Anyone have experience with these units? Joe, K1ike On 3/13/2025 9:05 AM, Jeff DePolo WN3A via groups.io wrote:
There is an old saying, Tektronix makes good scopes, and HP makes good RF equipment. Don't cross that line.That has been proven time and time again, although I have to admit I do have a combination scope/logic analyzer from HP that I find mostly-tolerable. |
|
SCHOOL RADIO PTToC
开云体育Does anyone know of any school bus company or school district currently using SCHOOL RADIO, (Brand) PTT over Cellular mobile and portable radios? ? If so, please advise as I am looking for a good reference for this new radio technology. It is similar to Digi-Talk, by the same company. ? Thank you. ? Regards, ? Charles F. Adams K3HKZ Industrial Communications Co. 121 N Sitgreaves Street Easton, PA 18042 Office 610-253-1214 Cell 610-360-0050 Fax 610-253-4504 ? From: [email protected] <[email protected]>
On Behalf Of Pro4XComm via groups.io
Sent: Wednesday, March 12, 2025 12:58 PM To: [email protected] Subject: [repeater-builder] Tektronix Y400 vs Anritsu Cell Master ? Does anyone have experience with both the Tektronix Y400 with YBA250 and YBT250 modules and the Anritsu Cell Master? I’m trying to decide on one for an entry level SA and VNA to use for radios, antenna systems and tuning duplexers. It’s not clear whether the Tektronix has a TG like the Anritsu and whether it would be suitable for tuning duplexers. I’m trying to determine whether I should lean towards one over the other. Any feedback would be greatly appreciated! |
|
Re: Tektronix Y400 vs Anritsu Cell Master
There is an old saying, Tektronix makes good scopes, and HP makes good RF equipment. Don't cross that line.That has been proven time and time again, although I have to admit I do have a combination scope/logic analyzer from HP that I find mostly-tolerable. We have a client that purchased two Tek RSA5000B's spectrum analyzers optioned out for digital TV measurements a few years ago. I absolutely hate them. --- Jeff WN3A |
|
Re: Tektronix Y400 vs Anritsu Cell Master
Does anyone have experience with both the Tektronix Y400 with YBA250 and YBT250 modules and the Anritsu Cell Master?I have a Cell Master. I guess as an "all in one" kind of box that will do sweeps, and for occasional use as a spectrum analyzer it's OK at best. Other than a Field Fox, I don't know of any all-in-one portable that comes close to doing what benchtop equipment is capable of doing, or does as accurately. If you're interested in a Cell Master I was going to sell mine, I rarely use it. I’m trying to decide on one for an entry level SA and VNA to use for radios, antenna systems and tuning duplexers.Anything "entry level" isn't going to be viable for tuning duplexers. For sweeping lines and antennas, a portable like a Sitemaster/Cell Master is the way to go - obviously you want something portable, the tower ain't gonna come to you. For tuning duplexers or any other serious filter work, a real VNA with enough dynamic range and good accuracy is essential. Since tuning duplexers isn't something you do in the field, there's no need for a portable unit here. An older HP from the 8750 series is the best bang for the buck. But beware - a VNA is only as good as the calibration components, test cables, etc. that go with it, and those often cost more than an older VNA itself. --- Jeff WN3A |
|
Re: TKR 851 repeater for sale
<----I disagree. The pre Version 2's didn't have the improved PAbulletproof. I was talking about the differences in firmware/features only and how they were less important if using an external controller...but yeah, there were issues with the first-gen V1 PA's. There were three revisions to the PA's in the UHF line and two on VHF if I remember right. --- Jeff WN3A |
|
Re: Tektronix Y400 vs Anritsu Cell Master
开云体育We had Y400s at work.?? They were in for repair a lot.?? I could have had one.?? I didn't want one.??? The Y400 reminded me of a Marconi 2955. ? It had a lot of clicking relays.?? I cannot speak on the Cell Master.? I don't consider my equipment entry level, although some might.?? On a budget, if I had to choose, a COM-120B or a 1600, since I am familiar with them, and a return loss bridge,?? A HP 8920, or 8921 would also be a good choice.? Not that you asked, I use a S113B for antennas, a IFR COM-120B, 1200s, and 1600s for real radio work.?? When you get old like me, a 1200 is a lot easier to take to sites, but it certainly has its limitations.?? A HP 8753ES for combiners and duplexers, and a ARRA 3428 line stretcher for determining cable lengths for the above.?? For portable use, a HP FieldFox would be nice, but I don't see that happening anytime soon. In my opinion, you are always better off with test equipment designed for what you are doing, if you really care about the end result, instead using a Jack of All Trades.? There is an old saying, Tektronix makes good scopes, and HP makes good RF equipment.? Don't cross that line. I'm sure someone will disagree with me.? Oh well... John? On 2025-03-12 23:33, Pro4XComm via groups.io wrote:
|
|
Updated Status of T.P.L. Amplifiers by Henry Radio
I had about a 10 minute chat with Bob at Henry Radio Wednesday afternoon. So here is what he had to say: 1. Henry Radio did not negotiate or in any way shape or form purchase T.P.L. Amplifiers. As such, they have no drawings or schematics for T.P.L. Amplifiers. They have no spare parts, boards, or otherwise for T.P.L. products. 2. Henry did purchase the domain registry and old voice phone number to T.P.L. The phone forwards straight to Bob's cell. 3. Henry DOES repair T.P.L. amplifiers. Turn around time is a little longer (a few weeks to a month on average) than on Henry products, because with no schematics, they basically are reverse engineering the circuits in the diagnosis process. They have 2 dedicated 2-way technicians that work on the T.P.L. products, while the other bench technicians work on the Henry line. 4. The old man Henry has retired. Bob is apparently in charge now, and will chat with anyone that has questions. No R.M.A. number is required. Just go to the Henry website and print out a hard copy of their repair form and include it with your T.P.L. amplifier for service. 5.Also, Henry is once again repairing their own name brand 220 MHz amateur amplifiers. They had ceased repairing them about 2 years ago, and refused repair on one of mine that I had purchased from them back then. If you have further questions, reach out to Bob directly during Henry's normal business hours. N5ZUA |
|
Re: Tektronix Y400 vs Anritsu Cell Master
They both cover the frequency range I would be interested in. I guess the part I'm unsure of is that the Anritsu specifically says in the functions that it has a signal generator whereas the Tektronix says it can be used as a "sine wave or continuous wave source" under "CW mode". I'm unsure whether this mode on the Tektronix would be suitable for tuning duplexers or whether the Anritsu would be the one I need. The Tektronix advertises it can test insertion loss/gain and return loss so would this be a good option for using it as an SA and also a VNA for tuning duplexers? |
|
Re: Reality check on capabilities of GRMS repeater
Putting a bow on the final installation by performing a sensitivity test with antenna vs a load and measuring any desense is very important. It doesn’t matter how well the repeater system works on a bench, you need the equipment and knowledge on how to perform final testing as duplexers can detune during shipment. Otherwise the installed repeater can be operating at many dB below what you think or saw on a test bench. If you don’t have access to a service monitor it can get very expensive hiring someone to perform testing and touch up tuning on site.
“All the rest of the tasks of building a repeater out of mobiles still exist: Duplexer tuning, Radio programming, Radio interconnect cabling, etc. and those are the more complicated tasks.” |
|
Re: Reality check on capabilities of GRMS repeater
In my mind the question of "to ID or not to ID" is not really a big deal. Using an ID-O-Matic is not much more complicated than using a cross over cable.? My experience with an e-bay cross-over cable was that it did not work out of the box. There was a jumper missing on one of the boards. So even with a simple cross over cable, one must understand and be able to verify each connection. And the audio level needs to be properly set with both the cable or the ID-O-Matic.?
?
All the rest of the tasks of building a repeater out of mobiles still exist: Duplexer tuning, Radio programming, Radio interconnect cabling, etc. and those are the more complicated tasks.
?
Larry |
Chris Boone WB5ITT
to navigate to use esc to dismiss