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Re: PD526 Duplexer Tuning
Check that the center pins of all your connectors on the cables are at the correct height. Also give a wiggle to the connectors at the cavity to see if your readings change significantly.? I've had a set of Wacom cavities where the connectors had cold solder joints on the center pins and With the PD-526 I've had a set where someone had pushed the center pin of the connector down to where it was barely making contact, and I've had another where the notch capacitor and coupling loop was damaged with the solder ripped off the ground end. On Wed, Apr 23, 2025, 11:36 Jeff DePolo WN3A via <jd0=[email protected]> wrote:
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Re: Astron RM-50M conversion
I used the simple way of having a relay that operated on the incoming line voltage and put either the power supply or battery to the equipment.? the relay was pulled in when we had line voltage and dropped out when the line voltage was lost.? Used a time delay relay set for about 10 seconds so the line voltage had to come back for 10 seconds before the battery dropped out.? That way we could use any battery and charger arrangement. Ralph ku4pt
On Thursday, April 24, 2025 at 01:15:42 AM EDT, Matthew Kaufman <matthew@...> wrote:
And I am wholeheartedly *against* the use of ¡°battery-specific chargers¡± except when they are used to standalone charge a battery with no load. The moment you put a load across the battery, especially one with wildly varying current draw like a repeater transmitter, it breaks all of the magic that the battery-specific chargers do to measure charge current, voltage, etc.? Better to float charge in this case. Or even better than that, to use a smart battery that does its own charge and load control. I do agree that you always need a low-voltage-disconnect though, unless you just want to kill batteries. Matthew Kaufman On Mon, Apr 21, 2025 at 8:21?PM Jim Aspinwall via <jim.no1pc=[email protected]> wrote:
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THREAT TO 222-225MHz Spectrum power point presentation for 220 Spectrum Management Association (Southern California) coming your way.
If you think this only affects Southern California please view the attached Power Point that will be presented during our Quarterly Zoom Meeting for our Coordination Group, the company causing harmful interference has a new license for Indiana, so no longer in Los Angeles they have licenses in Arizona and Indiana. Please educate and understand they intend to do testing at various locations across the US, that testing will impact Radio Amateur operations on the 222-225 MHz Spectrum.
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If you are a 222MHz Repeater Owner and would like to be a guest during our quarterly meeting of 220SMA where the attached power point will be presented, send me a message and I'll forward you the Zoom information.
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No one will fight for our spectrum but us, if they are successful which band is next? 1.2GHz, 440MHz, 2 meters?
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Re: Astron RM-50M conversion
And I am wholeheartedly *against* the use of ¡°battery-specific chargers¡± except when they are used to standalone charge a battery with no load. The moment you put a load across the battery, especially one with wildly varying current draw like a repeater transmitter, it breaks all of the magic that the battery-specific chargers do to measure charge current, voltage, etc.? Better to float charge in this case. Or even better than that, to use a smart battery that does its own charge and load control. I do agree that you always need a low-voltage-disconnect though, unless you just want to kill batteries. Matthew Kaufman On Mon, Apr 21, 2025 at 8:21?PM Jim Aspinwall via <jim.no1pc=[email protected]> wrote:
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Re: MFJ1112 DC power strip
If he doesn't take it, I'm interested.
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Butch Bussen WA0VJR butchb@... irlp 7135 allstar 56023 echolink 790800 ----- Original Message -----
From: "Chad Nelson via groups.io" <chad.nelson71@...> To: <[email protected]> Sent: Wednesday, April 23, 2025 8:21 PM Subject: [repeater-builder] MFJ1112 DC power strip Good evening all, about a week ago or maybe a little more I listed on here that I had a DC power bus for sale, it was the MFJ 1112 with six pairs of binding posts. That one has been sold, but another one has now come available from my repeater cabinet. There was another fellow interested W think his name was Robert. If that person was Robert and was interested, let me know because I have the one now available and dad has a 2 foot power cable because I'm modified it slightly the fit in my cabinet. I will get pictures of it and have those available. I will ship for $30. Oh, I should also mention that it has an Anderson power pole on the end of the power cable. Thanks and 73, Chad WI9HF Chad Nelson WI9HF/WRPL979 Janesville Wisconsin 608-754-8671 Send from my spectrum iPhone 16. |
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MFJ1112 DC power strip
Good evening all, about a week ago or maybe a little more I listed on here that I had a DC power bus for sale, it was the MFJ 1112 with six pairs of binding posts. That one has been sold, but another one has now come available from my repeater cabinet. There was another fellow interested W think his name was
Robert. If that person was Robert and was interested, let me know because I have the one now available and dad has a 2 foot power cable because I'm modified it slightly the fit in my cabinet. I will get pictures of it and have those available. I will ship for $30. Oh, I should also mention that it has an Anderson power pole on the end of the power cable. Thanks and 73, Chad WI9HF Chad Nelson WI9HF/WRPL979 Janesville Wisconsin 608-754-8671 Send from my spectrum iPhone 16. |
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Re: UHF 420MHZ Micor Mobile no pl encode
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From: [email protected] <[email protected]> on behalf of Jeff DePolo WN3A via groups.io <jd0@...>
Sent: Wednesday, April 23, 2025 1:56:23 PM To: [email protected] <[email protected]> Subject: Re: [repeater-builder] UHF 420MHZ Micor Mobile no pl encode ?
Yes, that¡¯s the right jumper to cut on the exciter board.? Did you confirm you have the right encoder board that matches the pin alignment on your exciter? ? ??????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A ? From: [email protected] <[email protected]>
On Behalf Of Tyler- WZ5TX via groups.io ? I believe it¡¯s JU404. The jumper is in place. When I removed it I lost TX. Encoder board was in. ? WZ5TX David ¡°Tyler¡± Bufkin ? From:
[email protected] <[email protected]> on behalf of Jeff DePolo WN3A via groups.io <jd0@...> ?
? You mentioned a jumper on the ¡°control board¡±, not sure which board you mean.? The jumper that needs to be removed for proper keying is on the exciter board.? The jumper that may need to be added is also on the exciter board.? There are no jumpers that need to be added or removed on the PL encoder board. ? One other thing that has made its way through a lot of dead brain cells ¨C there were two versions of the Micor PL encoder board, with the biggest difference being the alignment/spacing of the pin sockets.? Here¡¯s a pic of the two boards, confirm you¡¯re using the right one for the exciter you have. ? Also included is a pic of the Micor ¡°flat audio¡± board that took the place of the PL encoder.? The flat audio board was used in Micor PURC paging stations and DVP stations if I remember right.? It happened to be in the box of Micor PL decks, figured some Micor fans may not have seen one before¡ ? ??????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A |
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Re: Astron RM-50M conversion
¿ªÔÆÌåÓýJim, This is bad info, even BioEno says to not use more the 20amps when charging their 100Ah batteries. The trick to LifePo4 BMS's is to have the voltage above 14.6V to start the charging (kick it in), if you have completely drained the battery to BMS shutdown. Each battery Amp Hour rating has it's own max amperage for charging, hitting the battery with 50 amps, is liable to damage the cells, and ruin the battery. Kory On 2025-04-23 13:43, Jim Aspinwall via groups.io wrote:
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Re: UHF 420MHZ Micor Mobile no pl encode
¿ªÔÆÌåÓýYes, that¡¯s the right jumper to cut on the exciter board.? Did you confirm you have the right encoder board that matches the pin alignment on your exciter? ? ??????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A ? From: [email protected] <[email protected]> On Behalf Of Tyler- WZ5TX via groups.io
Sent: Wednesday, April 23, 2025 8:54 AM To: [email protected] Subject: Re: [repeater-builder] UHF 420MHZ Micor Mobile no pl encode ? I believe it¡¯s JU404. The jumper is in place. When I removed it I lost TX. Encoder board was in. ? WZ5TX David ¡°Tyler¡± Bufkin ? From: [email protected] <[email protected]> on behalf of Jeff DePolo WN3A via groups.io <jd0@...> ?
? You mentioned a jumper on the ¡°control board¡±, not sure which board you mean.? The jumper that needs to be removed for proper keying is on the exciter board.? The jumper that may need to be added is also on the exciter board.? There are no jumpers that need to be added or removed on the PL encoder board. ? One other thing that has made its way through a lot of dead brain cells ¨C there were two versions of the Micor PL encoder board, with the biggest difference being the alignment/spacing of the pin sockets.? Here¡¯s a pic of the two boards, confirm you¡¯re using the right one for the exciter you have. ? Also included is a pic of the Micor ¡°flat audio¡± board that took the place of the PL encoder.? The flat audio board was used in Micor PURC paging stations and DVP stations if I remember right.? It happened to be in the box of Micor PL decks, figured some Micor fans may not have seen one before¡ ? ??????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A |
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Re: PD526 Duplexer Tuning
¿ªÔÆÌåÓýPads are not needed with a VNA.? They might be needed if you¡¯re using a sig gen or tracking generator as a source that doesn¡¯t hold its output level constant when presented with a mismatch, but you wouldn¡¯t be turning for return loss then, would you? ? Pass gets tuned for return loss. ? Notch gets tuned for maximum insertion loss. ? From: [email protected] <[email protected]> On Behalf Of George Csahanin
Sent: Wednesday, April 23, 2025 12:53 PM To: [email protected] Subject: Re: [repeater-builder] PD526 Duplexer Tuning ? I've used 3db for this and 10db pads. Successful either? way. But the pads are needed.? ? I'm working on a 900 Quantar right now folding back power but it is an internal issue with the PA, not duplexer not antenna system ? GeorgeC W2DB |
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Re: PD526 Duplexer Tuning
I put the pad between duplexer and Input on service monitor? Or do I put one of both into duplexer and out to service monitor? On Wed, Apr 23, 2025, 10:52?AM George Csahanin via <george=[email protected]> wrote:
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Re: Astron RM-50M conversion
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I'd be cautious about this device relative to at least LiFePo, if not other types.? ?There's not a lot of information in the product docs I'd hope to see.
A great reference source: ?https://batteryuniversity.com/ Lead-acid and AGM generally share a desired/hopeful charge profile and stages - and should be provided a periodic desulfation maintenance higher voltage charge period. This function is not indicated in the docs.? (just floating and/or trickle charging lead-acid is one of the things that shortens their life, that's why the Astron, Samlex and similar battery options are, politely - "less than ideal" battery killers) LiFePo 'suggests' an appropriate charger be able to supply increased voltage and current for when a battery's built-in balance mode cycle should kick in.? For 100aH products the current need can be 50 amps +/-.? ? As well, if the internal BMS shuts the battery down (built in LVD), it's going to need a charger/profile smart enough to kick in and wake the battery up when mains power is restored.? ? This is not addressed in the RigRunner manual, and the indicated 10A charge rate is probably not sufficient to effect this needed restoration or balancing maintenance processes - at least for a battery bigger than say 20 AH.?? Again - second the Victron LVD between appropriate charger + battery and the load.? The LVD cutoff is settable appropriate to the minimum voltage whichever battery type should be cut off from the load.? As well their LiFePo-specific chargers.? Victron appears to be THE go-to product for many marine and RV DC system lead-acid/AGM to LiFePo upgrades.? ?? As to battery sources - BattleBorn has been considered THE vendor of choice, but BioEno, LiTime and WattCycle have been proving worthy.? ?I recommend NOT Renogy - their products are a little confusing in charge and balance behavior and their technical support *inhales deeply". ? |
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Re: UHF 420MHZ Micor Mobile no pl encode
So, if the encoder was in place, and that jumper is in, you might not get PL tone on tx.
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Again, that allows PTT to go through the encoder to give you reverse burst delay. It might also enable the encoder output, iow, leaving that jumper in place may mute the encoder output. If the encoder is in, the jumper should be out. On 4/23/2025 8:54 AM, Tyler- WZ5TX via groups.io wrote:
I believe it¡¯s JU404. The jumper is in place. When I removed it I lost TX. Encoder board was in. |
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Re: PD526 Duplexer Tuning
¿ªÔÆÌåÓýYou don¡¯t want to use pads when you¡¯re tuning for return loss¡which is how you should be tuning the pass. ? From: [email protected] <[email protected]> On Behalf Of Part 15 Engineer via groups.io
Sent: Wednesday, April 23, 2025 11:40 AM To: [email protected] Subject: Re: [repeater-builder] PD526 Duplexer Tuning ? No I did not. I think I have a 2, 3, 10, 15, 20 db pads but no 6. I'll ask my friend if he has a 6db 50 ohm pad. ? On Wed, Apr 23, 2025, 9:31?AM Mike via <prcradio=[email protected]> wrote:
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Re: PD526 Duplexer Tuning
I have 2.0 meters of 1/4 inch andrew hardline I'm going to use for measurements and then for when the duplexer is permanently installed. On Wed, Apr 23, 2025, 9:48?AM John via <jhaserick84=[email protected]> wrote:
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Re: PD526 Duplexer Tuning
The exact value is not critical, just has to be 50 ohms.? The 2 and 3 in series or the 10,15, and 20 would be ok but not many service monitors would have enough power to over come the loss of much over 6 db. Ralph ku4pt
On Wednesday, April 23, 2025 at 11:40:14 AM EDT, Part 15 Engineer via groups.io <kc8gpd@...> wrote:
No I did not. I think I have a 2, 3, 10, 15, 20 db pads but no 6. I'll ask my friend if he has a 6db 50 ohm pad. On Wed, Apr 23, 2025, 9:31?AM Mike via <prcradio=[email protected]> wrote:
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Re: PD526 Duplexer Tuning
The pass response curve from antenna port to TX port (and RX port) is much broader for the pass frequency than for the best return loss curve, and the 2 curves probably do not line up in your case. It may be that your nano VNA will show you this. You just don't have the dynamic range on most nanoVNAs to measure the notch depth, but it seems you can interpolate between the skirts it's center frequency,. If the duplexer cables from antenna port to TX side and RX side are the optimum lengths, then it is possible for both best pass and best return loss to match up. That is why Jeff said it is usually a compromise? not to use, for BP/BR duplexers, a return loss bridge or VNA.
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It seems to me that if you find, with your NanoVNA, that with the TX frequency notch on the RX side of the duplexer, the skirts of which are centered on the TX frequency (with the entire duplexer assembled) and at the same time the best return loss is say on the high side of the best pass frequency, the coax length between the antenna T and the RX side cans is too short, etc.
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John
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Re: PD526 Duplexer Tuning
Oh ok, Roger Roger. I'll try that when. I get home later today. On Wed, Apr 23, 2025, 9:44?AM Matt via <al0r=[email protected]> wrote:
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John N. Hudson III