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Date
Re: Motorola T1500 notch
Hey Skyler, You absolutely can. There's no real harm in doing it. Here are some considerations: Two true Bandpass resonators flanking your flatpack will give the total system *better* out of band
By Matt Lechliter · #183640 ·
Re: Motorola T1500 notch
If you are putting up a repeater, and you own the site (house site or something), you could use just two of them and do split antennas. 20-30' of vertical separation is enough in that case. You should
By wj9jrg · #183639 ·
Re: Motorola T1500 notch
Skyler, Part of the fun of armature radio is DIY. Do a little building and make it work. See the probes attached. Wayne
By wa5luy · #183638 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
One of the primary causes of switcher failures is line transients. Linear PSUs have built-in isolation (transformer) which switchers do not have. While degraded components, excessive load,
By Dan Woodie · #183637 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
In General, is there any theory on failure modes on switchers? Filter cap ESR degrades, duty cycle increases to keep up with current drain, transformer saturates, overheats and fails? Thoughts? I have
By RFI-EMI-GUY · #183636 ·
Re: Clamp meter
I currently use a Fluke AC/DC amp clamp and a Craftsman ACD/DC clamp. The craftsman measures down to the microamps, and works well. That external clamp sounds interesting Thanks and 73 Dean wrote:
By Dean/K2WW · #183635 ·
Re: Motorola T1500 notch
I agree that it isn¡¯t worth my time to convert a bandpass into a BpBr out of these but I thought i would see if anyone has. Is it acceptable to use a Mobile flat pack duplexer and then attach
By Skyler Fennell · #183634 ·
Re: Clamp meter
If you really want to test ground systems the ultimate is the AEMC 6416 and AEMC 6417. This can test amperage but also accurately tests ground resistance (without having to use the multiple stakes,
By Dan Woodie · #183633 ·
Re: Motorola T1500 notch
Hi Skyler, The T1500 cavities always were used in BpBr "mode". See the documentation on this site. You could readily make the coupling loops and probes for this but, time is money. There is nothing
By Alan Beard · #183632 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
This makes me want to put a fire retardant system in my IT room.? I hear there's a safer alternative to the old "Halon" systems. - Regards, Karl Shoemaker To contact me, please visit SRG's web site
By Karl Shoemaker · #183631 ·
Re: Clamp meter
Joe, I should have checked that out since I have had a minor issue of getting the clamp in-between some of the close spaced wires at one site. I'm getting geared up to be able to measure my equipment
By Karl Shoemaker · #183630 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
I had an Antec ATX supply that failed so badly it set a HDD on fire. Another Antec supply, while not causing visible damage, destroyed a motherboard. Why to this day if I spot an Antec supply in a
By Bob Dengler · #183629 ·
Re: Clamp meter
The one that I referenced has 1mA resolution. Keep in mind that I said this one is SIMILAR to the one we used, and is only an example of what is available. Joe
By Joe · #183628 ·
Re: Clamp meter
I have one of the Extech clamp meters and am very happy with it. It was recommended here by Eric Lemmon (SK) I used it when I was working for 48 volts DC current readings. I do have a Weston model 633
By John J. Riddell · #183627 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
Didn't want to see that, but at least I have a spare :-)
By JeffBanke · #183626 ·
Re: Clamp meter
Do they make a lower current DC version?
By Dean/K2WW · #183625 ·
Motorola T1500 notch
I have six T1500 cavities and I thought it would be nice to make a duplexer but they are just bandpass. Anyone here have any info or way to acquire the notch addons for these? Maybe it¡¯s easier to
By Skyler Fennell · #183624 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
Of course, the Motorola supply isn¡¯t immune from exploding either. This is a CPN1047:
By willpower1234 <radio5000@...> · #183623 ·
Re: Clamp meter
Hello I am finding more and more these days that a high resolution clamp meter to be very useful and time saving when measuring earth leakage. The? uni-t ut211b fits my needs.
By Mainline · #183622 ·
Re: The joys of ONAN power supplies in Motorola Quantar repeaters
It's not that bad. It just needs to be recharged with an extra-large can of Magic Smoke. Those early Onan PSUs are well-known for sometimes spectacular failures but I don't know that I have seen one
By Dan Woodie · #183621 ·