Re: THREAT TO 222-225MHz Spectrum Getting Worse with additional licenses issued outside of California
NOTHING is safe if "big money" wants
it... NOTHING.
Chuck
On 4/26/2025 4:25 PM, John N. Hudson
III via groups.io wrote:
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Bob we have discussed this and you have a valid point. But as
you know the spectrum is crowded in SoCal with only a few High
Level channels, Trustees are limited to 3 pairs but they can
co-channel themselves as long as it doesn't cause issues. We've
been asked about making the one channel high level, at this
point we're hoping more than one person will consider investing
in a digital 220 repeater. We may have to reconsider if no one
steps up, I personally would like to see one operational with
propagation of 220 having characteristics of VHF and UHF the
coverage may surprise folks.
?
Side Note: Today during the 220SMA meeting something I didn't
know was CAOS Capital has tested on the 2 meter spectrum in
addition to 222-225 MHz, additionally, they have ether tried to
receive licenses or had licenses from 27MHz-500MHz. Remember,
Amateur Radio is secondary in the 420-450MHz with Military as
Primary. Meaning, they could conduct tests in the UHF HAM
Spectrum so NO spectrum is safe and why its important whether
you use 220 or not, ALL HAMS need to fight for our spectrum
because none are safe. I will be posting more information as it
becomes available. Rick W6RE has done a deep dive on the company
and head engineer on this project with some very interesting
findings. It was an eye opener for me this morning, stay tuned.
Lastly, if you want to make a proposal to 220 SMA to install a
Digital Repeater even at a high level site nothings says you
can't and it will cause us to come back around and revisit the
subject. All the Best,
?
John N. Hudson III, WA6HYQ
?
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Re: THREAT TO 222-225MHz Spectrum Getting Worse with additional licenses issued outside of California
Bob we have discussed this and you have a valid point. But as you know the spectrum is crowded in SoCal with only a few High Level channels, Trustees are limited to 3 pairs but they can co-channel themselves as long as it doesn't cause issues. We've been asked about making the one channel high level, at this point we're hoping more than one person will consider investing in a digital 220 repeater. We may have to reconsider if no one steps up, I personally would like to see one operational with propagation of 220 having characteristics of VHF and UHF the coverage may surprise folks.
?
Side Note: Today during the 220SMA meeting something I didn't know was CAOS Capital has tested on the 2 meter spectrum in addition to 222-225 MHz, additionally, they have ether tried to receive licenses or had licenses from 27MHz-500MHz. Remember, Amateur Radio is secondary in the 420-450MHz with Military as Primary. Meaning, they could conduct tests in the UHF HAM Spectrum so NO spectrum is safe and why its important whether you use 220 or not, ALL HAMS need to fight for our spectrum because none are safe. I will be posting more information as it becomes available. Rick W6RE has done a deep dive on the company and head engineer on this project with some very interesting findings. It was an eye opener for me this morning, stay tuned. Lastly, if you want to make a proposal to 220 SMA to install a Digital Repeater even at a high level site nothings says you can't and it will cause us to come back around and revisit the subject. All the Best,
?
John N. Hudson III, WA6HYQ
?
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Re: Motorola SLR5700 DMR Repeater
Hi Guys
I am Sorry my reply to the original question should have been: Check your repeater settings, so it does not beacon,
WOW I got it !! Sorry I missed the post from another SL5700 user explaining what may be going on and how to correct it.
Bob
P.S. Chris where would you like me to go to turn in my License? I've seen a fer people pop off hot messages in frustration and my apologies to the group for trying to explain. I thought we used to Mentor people in the art or repeater building and troubleshooting.
On Friday, April 25, 2025 at 01:56:59 PM PDT, Chris Boone WB5ITT via groups.io <setxtelecom@...> wrote:
Beaconing 24/7 is permitted outside the automatic beacon subbands ONLY IF a control operator of the repeater xmtr, NOT the network, is monitoring the actual RF channel to prevent interference.. geese why do people NOT READ THE RULES? sorry folks but part 97 is part 97. ..if you can't follow them, turn in your license and go back to 27MHz or GMRS.?
If you think this is wrong, ask Riley or Laura...they've both sent notices to repeaters beaconing IDs , etc. Chris WB5ITT
Hi guys
The SLR5700 has a beacon that it transmits in DMR mode so the mobile and hand held units can synchronize the TDMA time slots and know there within range of the repeater???
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Re: PD526 Duplexer Tuning
Ignore the first two images close to the top. They are earlier plots.
On Sat, Apr 26, 2025, 11:33?AM Part 15 Engineer < kc8gpd@...> wrote: How does this look? It's a nanovna and nit a calibrated to nist piece of equipment so it's not going to be dead on even when you go through the calibration procedure for the nanovna.
I think this is the best it's going to get.
A number of things: ? - You¡¯re sweeping 30 MHz wide with only 401 points.? You need to either narrow down your sweep just to the range of interest, use more points, or more likely a combination of both.? I¡¯d typically be using a 10 MHz span and 1601 points (I don¡¯t have a NanoVNA, I don¡¯t know what it¡¯s capabilities are).
- Something is either very wrong with the cavity, or the calibration.? It is showing you have 3.129 of insertion loss in the bandpass; it should be about 0.25 dB for a properly-functioning PD526 resonator.? Likewise, at the notch frequency, it¡¯s showing that you have 4.77 dB of return loss ¨C it should be a lot closer to zero.? If I were to take a WAG, you have 3 dB or more of cable loss that isn¡¯t compensated for, and/or something is wrong with your calibration kit.
- No since in working on the full duplexer harnessed together until the above are first addressed and you know each cavity is properly tuned individually.
? --- Jeff WN3A ? ? Here is the plot for a single cavity. ? Ok, I'm tuning the pd526 on the nvna. I can't seek to get everything to line up on both reject and pass simultaneously. It seems to be one or the other. I have attached pic of my latest plot. This is the best I got it so far. I did tune cavities individually then hook them together. And I got multiple peaks and valleys on the plot instead on one nice peak on the pass and valley on the reject. Does anyone have a link to the plot for the pd526 and what it should look?like? Thanks
 ? I think I finally got the pd526 tuned. It has 1db difference in sensitivity between direct input and going through duplexer and very little tx power loss coming out of duplexer. Probably only a few watts of loss. Tomorrow I will do some field testing to see if it gets put as far as the txrx 28-70-15h duplexer I was using. I'm not seeing any signs of desense yet. ? It will have the opposite effect.? To get more dynamic range you would really need an amplifier or a way to drive in more signal.? The pads are just to match the impedance as the output/input terminals may not be the nominal 50 ohms.? That is just for the notches.? If tuning the pass with a RLB do not use a pad as this will give a false match/very low RL . On Thursday, April 24, 2025 at 11:28:09 AM EDT, Part 15 Engineer via <kc8gpd=[email protected]> wrote: Will a pad give the nanovna more of a dynamic range to see? the notch depth? Iirc the dynamic range of a standard nvna is about 60 to 80db. So if I put a 10 or 15db pad that should help with tuning the notches? ? Pads can be helpful on the generate side of a VNA providing a good resistive match to the device under test. Many years ago working at Hughes Aircraft we always terminated our generate cables with a 6dB pad.?
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Re: Help with out of range programming a Motorola GP300
Hello Ron,
A couple things here. The "1" in the last of the model number is 433 MHz not 443 MHz. I believe that with the shift method, or hex edit, will only let you go down in frequency, not up.
You also don't say what frequencies you are trying to use.
Mick - W7CAT
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----- Original Message ----- From: "Ron via groups.io" To: [email protected]Sent: Saturday, April 26, 2025 08:19:02 AM Subject: [repeater-builder] Help with out of range programming a Motorola GP300 I was recently given a pair of GP300 HTs and am trying to get them reprogrammed for some new hams in the area.
I have the programmer and RSS and can download the codeplug. But,
these are 398-443 MHz RX radios (P94YPC20C1) and won't allow me to put the Amateur repeater frequencies in.
I've tried the Shift key trick when entering frequencies to no avail
(have used this successfully on Radius and GM300 models).? Even tried using a Hex editor and directions I found here to alter the ID bit associated with the model.
Neither works.
Any thoughts on what to try next?
ron
-- Untitled Document
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Help with out of range programming a Motorola GP300
I was recently given a pair of GP300 HTs and am trying to get them reprogrammed for some new hams in the area.
?
I have the programmer and RSS and can download the codeplug.? But, these are 398-443 MHz RX radios (P94YPC20C1) and won't allow me to put the Amateur repeater frequencies in.
?
I've tried the Shift key trick when entering frequencies to no avail (have used this successfully on Radius and GM300 models).? Even tried using a Hex editor and directions I found here to alter the ID bit associated with the model.
?
Neither works.
?
Any thoughts on what to try next?
?
ron
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Re: PD526 Duplexer Tuning
A number of things: ? - You¡¯re sweeping 30 MHz wide with only 401 points.? You need to either narrow down your sweep just to the range of interest, use more points, or more likely a combination of both.? I¡¯d typically be using a 10 MHz span and 1601 points (I don¡¯t have a NanoVNA, I don¡¯t know what it¡¯s capabilities are).
- Something is either very wrong with the cavity, or the calibration.? It is showing you have 3.129 of insertion loss in the bandpass; it should be about 0.25 dB for a properly-functioning PD526 resonator.? Likewise, at the notch frequency, it¡¯s showing that you have 4.77 dB of return loss ¨C it should be a lot closer to zero.? If I were to take a WAG, you have 3 dB or more of cable loss that isn¡¯t compensated for, and/or something is wrong with your calibration kit.
- No since in working on the full duplexer harnessed together until the above are first addressed and you know each cavity is properly tuned individually.
? --- Jeff WN3A ?
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From: [email protected] <[email protected]> On Behalf Of Part 15 Engineer via groups.io
Sent: Saturday, April 26, 2025 7:46 AM
To: [email protected]
Subject: Re: [repeater-builder] PD526 Duplexer Tuning? Here is the plot for a single cavity. ? Ok, I'm tuning the pd526 on the nvna. I can't seek to get everything to line up on both reject and pass simultaneously. It seems to be one or the other. I have attached pic of my latest plot. This is the best I got it so far. I did tune cavities individually then hook them together. And I got multiple peaks and valleys on the plot instead on one nice peak on the pass and valley on the reject. Does anyone have a link to the plot for the pd526 and what it should look?like? Thanks
 ? I think I finally got the pd526 tuned. It has 1db difference in sensitivity between direct input and going through duplexer and very little tx power loss coming out of duplexer. Probably only a few watts of loss. Tomorrow I will do some field testing to see if it gets put as far as the txrx 28-70-15h duplexer I was using. I'm not seeing any signs of desense yet. ? It will have the opposite effect.? To get more dynamic range you would really need an amplifier or a way to drive in more signal.? The pads are just to match the impedance as the output/input terminals may not be the nominal 50 ohms.? That is just for the notches.? If tuning the pass with a RLB do not use a pad as this will give a false match/very low RL . On Thursday, April 24, 2025 at 11:28:09 AM EDT, Part 15 Engineer via <kc8gpd=[email protected]> wrote: Will a pad give the nanovna more of a dynamic range to see? the notch depth? Iirc the dynamic range of a standard nvna is about 60 to 80db. So if I put a 10 or 15db pad that should help with tuning the notches? ? Pads can be helpful on the generate side of a VNA providing a good resistive match to the device under test. Many years ago working at Hughes Aircraft we always terminated our generate cables with a 6dB pad.?
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Re: PD526 Duplexer Tuning
Your picture tells a lot.? My guess is that the cans on the same side of the duplexer are over coupled because of improper coax length between the cans. In other words, with the proper 1/4 wavelength , a short on one end creates very high impedance on the other end which gives the most isolation or decoupling between cans on the same side of the duplexer. It may only be off less than 1 inch length at UHF.
Since the best return loss perfectly aligns with least insertion loss, the length of coax between the antenna T and the opposite side cans is the proper length, so that is good.
?
John
On 04/26/2025 6:51 AM EDT Part 15 Engineer via groups.io <kc8gpd@...> wrote:
?
?
Ok, I'm tuning the pd526 on the nvna. I can't seek to get everything to line up on both reject and pass simultaneously. It seems to be one or the other. I have attached pic of my latest plot. This is the best I got it so far. I did tune cavities individually then hook them together. And I got multiple peaks and valleys on the plot instead on one nice peak on the pass and valley on the reject. Does anyone have a link to the plot for the pd526 and what it should look?like?
?
Thanks
I think I finally got the pd526 tuned. It has 1db difference in sensitivity between direct input and going through duplexer and very little tx power loss coming out of duplexer. Probably only a few watts of loss. Tomorrow I will do some field testing to see if it gets put as far as the txrx 28-70-15h duplexer I was using. I'm not seeing any signs of desense yet.
?
It will have the opposite effect.? To get more dynamic range you would really need an amplifier or a way to drive in more signal.? The pads are just to match the impedance as the output/input terminals may not be the nominal 50 ohms.? That is just for the notches.? If tuning the pass with a RLB do not use a pad as this will give a false match/very low RL .
?
Ralph ku4pt
?
?
On Thursday, April 24, 2025 at 11:28:09 AM EDT, Part 15 Engineer via <kc8gpd= [email protected]> wrote:
?
?
Will a pad give the nanovna more of a dynamic range to see? the notch depth? Iirc the dynamic range of a standard nvna is about 60 to 80db. So if I put a 10 or 15db pad that should help with tuning the notches?
Pads can be helpful on the generate side of a VNA providing a good resistive match to the device under test. Many years ago working at Hughes Aircraft we always terminated our generate cables with a 6dB pad.?
?
?
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Re: PD526 Duplexer Tuning
Here is the plot for a single cavity.
Ok, I'm tuning the pd526 on the nvna. I can't seek to get everything to line up on both reject and pass simultaneously. It seems to be one or the other. I have attached pic of my latest plot. This is the best I got it so far. I did tune cavities individually then hook them together. And I got multiple peaks and valleys on the plot instead on one nice peak on the pass and valley on the reject. Does anyone have a link to the plot for the pd526 and what it should look?like?
Thanks 
I think I finally got the pd526 tuned. It has 1db difference in sensitivity between direct input and going through duplexer and very little tx power loss coming out of duplexer. Probably only a few watts of loss. Tomorrow I will do some field testing to see if it gets put as far as the txrx 28-70-15h duplexer I was using. I'm not seeing any signs of desense yet.
It will have the opposite effect.? To get more dynamic range you would really need an amplifier or a way to drive in more signal.? The pads are just to match the impedance as the output/input terminals may not be the nominal 50 ohms.? That is just for the notches.? If tuning the pass with a RLB do not use a pad as this will give a false match/very low RL .
Ralph ku4pt
On Thursday, April 24, 2025 at 11:28:09 AM EDT, Part 15 Engineer via <kc8gpd= [email protected]> wrote:
Will a pad give the nanovna more of a dynamic range to see? the notch depth? Iirc the dynamic range of a standard nvna is about 60 to 80db. So if I put a 10 or 15db pad that should help with tuning the notches?
Pads can be helpful on the generate side of a VNA providing a good resistive match to the device under test. Many years ago working at Hughes Aircraft we always terminated our generate cables with a 6dB pad.?
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Re: PD526 Duplexer Tuning
Ok, I'm tuning the pd526 on the nvna. I can't seek to get everything to line up on both reject and pass simultaneously. It seems to be one or the other. I have attached pic of my latest plot. This is the best I got it so far. I did tune cavities individually then hook them together. And I got multiple peaks and valleys on the plot instead on one nice peak on the pass and valley on the reject. Does anyone have a link to the plot for the pd526 and what it should look?like?
Thanks 
I think I finally got the pd526 tuned. It has 1db difference in sensitivity between direct input and going through duplexer and very little tx power loss coming out of duplexer. Probably only a few watts of loss. Tomorrow I will do some field testing to see if it gets put as far as the txrx 28-70-15h duplexer I was using. I'm not seeing any signs of desense yet.
It will have the opposite effect.? To get more dynamic range you would really need an amplifier or a way to drive in more signal.? The pads are just to match the impedance as the output/input terminals may not be the nominal 50 ohms.? That is just for the notches.? If tuning the pass with a RLB do not use a pad as this will give a false match/very low RL .
Ralph ku4pt
On Thursday, April 24, 2025 at 11:28:09 AM EDT, Part 15 Engineer via <kc8gpd= [email protected]> wrote:
Will a pad give the nanovna more of a dynamic range to see? the notch depth? Iirc the dynamic range of a standard nvna is about 60 to 80db. So if I put a 10 or 15db pad that should help with tuning the notches?
Pads can be helpful on the generate side of a VNA providing a good resistive match to the device under test. Many years ago working at Hughes Aircraft we always terminated our generate cables with a 6dB pad.?
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Re: Motorola gp340 as echolink node
Forgot to reply,?
?
Everything works, thanks Duane.
Echolink is up and working great!
?
73
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Re: Astron RM-50M conversion
So the IOTA DLS-45 w/IQ4 LiFePo module will do this:
Charge at 45 amps (the limit) with a target voltage setpoint of 14.7 volts. When it detects 14.6 volts OR 240 minutes in this mode has elapsed, it will then continue in this mode for 15 more minutes, then switch to float mode. Float mode is an attempt?to hold a constant voltage of 13.6 volts (up to the 45 amp limit of the charger). If the voltage drops below 12.8 volts OR 15 days elapse, it starts over at the beginning.
Assuming your two isolation diodes are identical, and assuming zero loss in the LVD (most MOSFET-based LVDs are essentially zero voltage drop, as are all relay-based ones) and assuming a 13.8 volt "DC supply" as the secondary source, the following happens:
1. When the batteries are low, the IOTA outputs (up to) 14.7 volts, which exceeds the voltage of the supply. The moment the batteries charge to the point where the voltage across them exceeds 13.8 volts, some of the charge current is diverted to your load (at up to 14.7 volts minus the voltage drop of the isolation diode). Once the voltage across the batteries reaches 14.6 volts or 240 minutes has elapsed -- then -- 15 minutes later... 2. The IQ4 will drop the target voltage to 13.6 volts, but the battery voltage will exceed your DC supply voltage for a while and the battery will power your load as it discharges from completely full. It'll "share" with the DC supply, but because the voltage is higher, the majority of the load current will be drawn from the batteries until they are drained to 13.8 volts. Fortunately, a LiFePO4 battery is still roughly 90% full, maybe more, at that voltage, so you haven't lost *that* much capacity. At that point, current is shared between the battery and the DC supply, and shortly thereafter the battery stops providing any useful power because its voltage (minus the blocking diode drop) is lower than the 13.8 (minus its blocking diode drop) and the DC supply takes over the load completey. 3. The batteries then sit doing nothing at a float voltage of 13.6 volts... because there's no load on them, they'll never go below that, and 15 days later the cycle repeats from the top whether the batteries need it or not.
If/when there is a power outage, the batteries, which should be *mostly* charged up by that 13.6 volt float voltage, take over and power the load until the LVD trips off. Once power returns, the above cycle starts at the top. If 45 amps divided across the four batteries for 240+15 minutes isn't enough to fully charge them back up after the outage, they'll just slow charge at the trickle rate after that... so hopefully you don't get another outage soon.
Note that the Battle Born 12v battery will disconnect at >14.7 volts, so hopefully the IQ4 doesn't actually go any higher than that. It will also disconnect at <10.6 volts but if you don't reboot it soon it is hard to recover, so you want your LVD set higher than that.?
Matthew Kaufman
On Thu, Apr 24, 2025 at 6:41?PM Jim Aspinwall via <jim.no1pc= [email protected]> wrote: Good points. Trying to capture this graphically as things progress.? Attached JPG... a) choose your battery and appropriate charging technology b) isolate battery from mains supply of choice... (D1 and D2) b.1) perhaps to further isolate the batteries and mains 'conflict'... apply multiple 'D1' in series - enough to establish the differential between their voltages so the batteries are not taking load (as their voltage is presented lower via D1(s)) when mains source is available c) I'm not much in favor of the mains vs battery relay option...? prefer not dropping power to the rack gear and restoring in a cut-over if it can be avoided.? Depending on what's in the rack, some things don't recover well if at all - Pi-based devices for one. d) not going to be perfect +/- either battery technology... preferably leave them out of circuit as much as possible unless/until needed and can 'gracefully' take the load, and otherwise not be over- or under-charged.? ? ?"hard floating" lead acid is/was probably OK if you have the budget and mindset to check and rotate them out.?? It's possible in my evolution of all this I give up on the LiFePo options and just do what I can with the remaining former data center UPS AGMs I have - at 97# a piece. 
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Re: Difficulty Programming a Maxtrac 300, 32 Channel
I got a bunch of HP thin clients with real serial ports on them that I use freeDOS on. It just works. All DOS based programming apps have worked with issue. They are 12V too!
Contact me direct if you want one. $20 plus ship.
Benjamin, KB9LFZ?
On Fri, Apr 25, 2025, 10:10 Ranger Radio via <motorolaradio7000= [email protected]> wrote: For DOS on modern PC's, I had success when faced with many failures to run RSS for HT1000's, MT1000's and similar so far work
Made a bootable USB stick (used a spare 8Gb that was around) and loaded FreeDOS on it following online references for how to do this. Changed the boot order for the windows 7 toughbook I use for programming and it works without any issues - like scary how well this replicated having a 286 laptop 20 years ago running RSS
Notes - PC cannot be UEFI bios. You should only use with a PC that has a native serial port - not seeing a likely to have this port to a USB serial device.
Jason
On Sun, Apr 20, 2025, 10:31?PM Chris Boone WB5ITT via <setxtelecom= [email protected]> wrote: I run VMBOX on Win10...load XP SP3 32BIT on the VM box..it can run anything you need
Chris WB5ITT?
Jared
Do you have just one Maxtrac that you want programmed??? or do you have a shelf, box, or storage room full of them ?? what band Maxtrac do you have?
L/B, VHF, UHF, 800, 900? and what would you like to put in them?
if its just one then maybe someone out here can help you. There are still some of us running 386 computers (collecting dust most of the time)
You can always look for an older Panasonic Toughbook, they have a real DB9 comm port (com 1) along with a single usb port, load DOS 6.22 and then load the Maxtrac or Maxlab software, hook up the RIB box & Cable & have fun,
Bob KD6GNB
On Sunday, April 20, 2025 at 10:45:40 AM PDT, Jared Smudde via <computerwhiz02= [email protected]> wrote:
I¡¯ve made numerous attempts to use DosBox over the years and have never had any luck. I¡¯ve got a 486 laptop that I use for DOS software and before that I used to program them with a 2007 dual core AMD processor running FreeDOS off a USB drive. The only issue I¡¯ve had with processor speed is the R100 software and the Radius M10 software.?
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Re: Motorola SLR5700 DMR Repeater
The beacon transmitted on Mototrbo systems is primarily for Roaming and that's where a radio makes a decision which repeater to use based on the strongest beacon. Similar to voting in other systems, except in a voting system, the repeater makes the choice, not the radio. We Don't do roaming in ham and another thing about having beaconing turned on, especially set to transmit every 60 seconds, it keeps the cooling fans wound up at high speed 24/7. Not to mention cluttering the air ways with unnecessary RF. We have ours off!
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Re: Motorola SLR5700 DMR Repeater
On 4/25/2025 3:26 PM, Chris Boone WB5ITT via groups.io wrote: Beaconing 24/7 is permitted outside the automatic beacon subbands ONLY IF a control operator of the repeater xmtr, NOT the network, is monitoring the actual RF channel to prevent interference.. geese why do people NOT READ THE RULES? sorry folks but part 97 is part 97. ..if you can't follow them, turn in your license and go back to 27MHz or GMRS.
If you think this is wrong, ask Riley or Laura...they've both sent notices to repeaters beaconing IDs , etc.
Chris WB5ITT
On Thu, Apr 24, 2025, 7:31?PM bob ehrhorn via groups.io <> <behrhorn@... <mailto:[email protected]>> wrote:
Hi guys
The SLR5700 has a beacon that it transmits in DMR mode so the mobile
and hand held units can synchronize the TDMA time slots and know
there within range of the repeater???
***And you should turn it off.
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Re: Astron RM-50M conversion
Sure, but no "13.8 volt regulated supply" will be *higher* than the bulk charge or equalization voltage (in excess of 14 volts) for an AGM charger.
Matthew Kaufman
> The battery-specific charger still sees the load (albeit via a voltage drop from the diode).
Only if the charger/battery combination are higher voltage than the power supply output, assuming equal voltage drop across the diode block.? As long as the power supply voltage is higher, the battery backup system remains isolated from the load.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? --- Jeff WN3A
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Re: Motorola SLR5700 DMR Repeater
Beaconing 24/7 is permitted outside the automatic beacon subbands ONLY IF a control operator of the repeater xmtr, NOT the network, is monitoring the actual RF channel to prevent interference.. geese why do people NOT READ THE RULES? sorry folks but part 97 is part 97. ..if you can't follow them, turn in your license and go back to 27MHz or GMRS.?
If you think this is wrong, ask Riley or Laura...they've both sent notices to repeaters beaconing IDs , etc.
Chris WB5ITT
Hi guys
The SLR5700 has a beacon that it transmits in DMR mode so the mobile and hand held units can synchronize the TDMA time slots and know there within range of the repeater???
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Re: Need help on the Quantar test microphone
Or bring them with you to Hamvention Jeff.
Gary
toggle quoted message
Show quoted text
- Also same mic as the Mostar,
Traxar snd MSF5000.
?
I think I have some Mostar mics somewhere.?
Those had the ¡°flat¡± coiled cord if I remember right.?
If the OP needs one, email direct and I¡¯ll see if I can find one.
?
???????????????????????????????????????????????????????????????????????????????
--- Jeff WN3A
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Re: Difficulty Programming a Maxtrac 300, 32 Channel
For DOS on modern PC's, I had success when faced with many failures to run RSS for HT1000's, MT1000's and similar so far work
Made a bootable USB stick (used a spare 8Gb that was around) and loaded FreeDOS on it following online references for how to do this. Changed the boot order for the windows 7 toughbook I use for programming and it works without any issues - like scary how well this replicated having a 286 laptop 20 years ago running RSS
Notes - PC cannot be UEFI bios. You should only use with a PC that has a native serial port - not seeing a likely to have this port to a USB serial device.
Jason
On Sun, Apr 20, 2025, 10:31?PM Chris Boone WB5ITT via <setxtelecom= [email protected]> wrote: I run VMBOX on Win10...load XP SP3 32BIT on the VM box..it can run anything you need
Chris WB5ITT?
Jared
Do you have just one Maxtrac that you want programmed??? or do you have a shelf, box, or storage room full of them ?? what band Maxtrac do you have?
L/B, VHF, UHF, 800, 900? and what would you like to put in them?
if its just one then maybe someone out here can help you. There are still some of us running 386 computers (collecting dust most of the time)
You can always look for an older Panasonic Toughbook, they have a real DB9 comm port (com 1) along with a single usb port, load DOS 6.22 and then load the Maxtrac or Maxlab software, hook up the RIB box & Cable & have fun,
Bob KD6GNB
On Sunday, April 20, 2025 at 10:45:40 AM PDT, Jared Smudde via <computerwhiz02= [email protected]> wrote:
I¡¯ve made numerous attempts to use DosBox over the years and have never had any luck. I¡¯ve got a 486 laptop that I use for DOS software and before that I used to program them with a 2007 dual core AMD processor running FreeDOS off a USB drive. The only issue I¡¯ve had with processor speed is the R100 software and the Radius M10 software.?
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How many in a Chinese dozen???
This is only a test
Test ? Attached is some information on the DB212 antennas.? Perhaps this will help.? This was factory info from a DB212-2 that was tuned to 47.14 MHz. 73 Joe WB4HIS ? ? ? ? Roger,
In hopes of answering your original question, I got my hands on a DB212-2 originally on 37.7MHz and shortened the antennas and matching section for 6?
meters. The 35 ohm matching section (Decibel Products VB-83 cable) was shortened?
to 36.25" end to end. With a UHF T on the end?
and two 50 ohm loads attached resulted in the attached plot. As you can see, the?
exact length is not critical across the band. John,
You mentioned "DB factory lengths" in an earlier post. Do you have access to the?
actual factory length chart for 6M ? If so, please share. How well did the tuning of your antenna on the ground translate to mounting on a tower? What length of pipe did you use when tuning? <6meter DB212-2 matching section.png>
<DB212-2 Information.pdf> <DB212 (pg 6-7).pdf>
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John N. Hudson III
KB9LFZ
Chris Boone WB5ITT