Re: Series-mode surge protection
I am not a fan of the SurgeX units.? I have seen little evidence that they do what they claim and there are some serious design flaws for such an expensive unit.? An example would be the obvious one - a ground bonding point.? They don't have one and rely solely on the power safety ground connection which does not provide a good bond for bonding purposes.
You would be much better off installing a Type 2A SPD with SADs and MOVs in replaceable modules at your electric panel plus a Type 3 SPD PDU at your equipment.? This combination takes care of the vast majority of spikes and surges effectively and they do not blow unless there is a very significant incident.? This is the combination specified for communications sites in Motorola R56 and thousands of mission-critical communications sites use this configuration effectively.? I would trust that any day over a snake-oil solution.
Dan Woodie, CETsr KC8ZUM
I recently installed?series-mode surge protection devices (SurgeX SX-1115-RT) on two repeaters that have switched-mode power supplies.? The surge protectors do not use sacrificial components such as Metal Oxide Varistors (MOVs) that are commonly used in low-cost units.??They are designed to withstand up to 1000 occurrences of surge pulse voltages up to 6000 volts, or 500,000 occurrences of 1000 volts.
I don't have any way to monitor line voltage surges or spikes, so I can't tell whether the devices are actually doing anything on a day-to-day basis.
I have two theories:
1. Occasional, small voltage spikes can gradually weaken semiconductors such as MOSFETs used in switching supplies.
2. Large voltage spikes?are most likely to occur at precisely the time when the repeaters are most needed, i.e. during some type of disaster.
The series-mode surge protectors appeal to me because they protect the equipment from a virtually unlimited number of small surges on a day-to-day basis while also handling occasional large spikes without without requiring a human to visit the site to replace a self-sacrificing surge protector.
I am whether anyone else has experience using series-mode surge protection devices at repeater sites.? Are there any downsides to these devices?? For example, are the devices prone to failure due to age, heat, moisture, dust, or vermin?
|
Re: International crystal manufacturing
OK, yes, I was talking about the old stuff. I remember as a kid
walking by the local CO when someone was there with the door open.
Remember all the click, click, click sounds and massive pairs of
wires. Also, there was a number you could dial to get what they
called "galloping relays." Party line phones had to enter a 2-digit
prefix to make long distance calls so the billing went to the proper
house.
The number we has back then was 3-2663. That later changed to
753-2663, but you quickly learned that the equipment would respond
fine to 73-2663, skipping the 5. These days we are dialing 10 digits
for any call, including local. Many times I recall tapping out a
number with a phone having no dial, or just doing it because I
could.
Chuck
On 11/19/2022 10:04 AM, Kevin
Magloughlin wrote:
toggle quoted message
Show quoted text
But in direct response, telling the CO switch to set up for a
toll call only applied in a mechanical office. The rest of it,
shall we say, is all software now and makes absolutely no
difference in call processing. ? I am dealing with some
databases in northern California where the PUC has mandated
no-prefix dialing. ?Not sure why but I imagine it¡¯s to make a
wireline phone act like a cellphone. ?Just my guess¡
|
Re: International crystal manufacturing
Fred was the translations engineer where I worked.? Laurel was a customer service rep that, after a tour if the switch office, thought translations would be interesting.??
The company allowed her to come over one day a week to watch him work.? After a couple of months she transferred into engineering and she was a "wizard" with the translations stuff.
Eric
On Sat, Nov 19, 2022, 10:52 Jamie WW3S < ww3s@...> wrote: Local telco¡.GTE?
> On Nov 19, 2022, at 9:23 AM, Joe <k1ike_mail@...> wrote:
>
> ?Hello Kevin,
>
> "Sr Translations Engineer"? That's a title that I haven't heard in years.? I did translations back in the 1980's for the local Telco here in Connecticut.? Sometimes interesting, sometimes boring.
> (For those curious, translations=software programming in telephone company lingo)
>
> Joe
>
>
>
>
>
|
Re: International crystal manufacturing
Local telco¡.GTE?
toggle quoted message
Show quoted text
On Nov 19, 2022, at 9:23 AM, Joe <k1ike_mail@...> wrote:
?Hello Kevin,
"Sr Translations Engineer" That's a title that I haven't heard in years. I did translations back in the 1980's for the local Telco here in Connecticut. Sometimes interesting, sometimes boring.
(For those curious, translations=software programming in telephone company lingo)
Joe
|
Zero hang time (tail) and let the Micor dual squelch do the work.? Works for me with the JPS voter.
--
-
Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
|
Re: Series-mode surge protection
I still fall back on my experience with microwave stations that use the "grid" as a battery charger, no more. The Ratelco chargers (rectifiers as the old-times would call it (like condenser instead of capacitors) work well. We also had the C&D chargers.? Both of them did have some low-tech regulation, but who cares as long as the station battery holds the load and ignores any surges.
If you don't want to use a battery backup then perhaps the Astron line?
--
-
Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
|
Re: International crystal manufacturing
OK Karl,
?011 31 229 230 044
Doug - GM7SVK
On 18/11/2022 17:37, Karl Shoemaker
wrote:
toggle quoted message
Show quoted text
Now that's been several years since they closed their doors anyone
heard if the "files" were kept?? My dream (yea, I know) is some of
the ex employees got together to start up a new company that
compensates channel elements.??? While I'm pipe dreaming, it would
be a plus if it was in the USA.
--
-
Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
|
Re: International crystal manufacturing
This is all very interesting. My Dad worked for Hawaiian telphone company in the 1960's.?? As a bratt I would run around the CO in Hilo playing with the step switches and even got a shock from the ring generator !??
I was way too young to understand the big picture but already knew what relays were.
So, lots of info here, but...........so.......what's the full dial string that needs to happen to get those guys??
--
-
Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
|
Re: Looking for a PROVEN power supply regulator board design
The standard is using the 723 (or later updated version) regulator IC driving pass transistors which handle the current in linear designs. Switching designs is a bit more complicated.
Dear group,
Any recommendationpower supply regulator board circuit which is tested and proven? I would like to build a pair of 30-40A power supplies for a friend and could use some help
Thanks Alexandre, PU2SEX Enviado do meu Tele-Movel
|
Re: International crystal manufacturing
I used to handle programming ROLM?CBXs for Gulf States Utilities. We had our own internal telephone network through Texas and La...would send in-state LD calls to the opposite state tandem switch via microwave or T1 trunks then out the tandem in that state so the rate was cheaper...saved over $1 million a year that way. When Entergy took over, we had to show them how to route calls internally. They were using?a bubble chart and access codes (UGH)....even though they had ROLMs and Nortels...duh...I came up with the current Unified Dialing Plan (9+ for outside calls and LD, 8+7 for internal calls) ....now its all Crapco (lol)..the conference calls became a joke due to latency and delay through the bridges which were still analog...
When I worked for Disney/ABC they also had an internal network world?wide using primarily?Nortel Option switches. These days VOIP has made all that a moot point.
Hello Kevin,
"Sr Translations Engineer"? That's a title that I haven't heard in years.? I did translations back in the 1980's for the local Telco here in Connecticut.? Sometimes interesting, sometimes boring.
(For those curious, translations=software programming in telephone company lingo)
Joe
|
Re: International crystal manufacturing
Yes we were well hidden. ?
And for those questioning what this has to do with repeaters, there is a direct tie in.?
AT&T had analog MSF5000 repeaters on the microwave sites that had a 4 wire circuit going back to the regional #4ESS that provided a switch based method of interconnection between repeaters. ?When microwave had problems they used their radios and had a private two-digit dialing plan to get to the destination repeater. ? I saw DLR/CLR (design layout record/circuit layout record) that was left on a couple of sites that showed everything including the dialing plan.
In a way, this could be described as a VERY EXPENSIVE predecessor to IRLP.?
So there it is¡
|
Series-mode surge protection
I recently installed?series-mode surge protection devices (SurgeX SX-1115-RT) on two repeaters that have switched-mode power supplies.? The surge protectors do not use sacrificial components such as Metal Oxide Varistors (MOVs) that are commonly used in low-cost units.??They are designed to withstand up to 1000 occurrences of surge pulse voltages up to 6000 volts, or 500,000 occurrences of 1000 volts.
I don't have any way to monitor line voltage surges or spikes, so I can't tell whether the devices are actually doing anything on a day-to-day basis.
I have two theories:
1. Occasional, small voltage spikes can gradually weaken semiconductors such as MOSFETs used in switching supplies.
2. Large voltage spikes?are most likely to occur at precisely the time when the repeaters are most needed, i.e. during some type of disaster.
The series-mode surge protectors appeal to me because they protect the equipment from a virtually unlimited number of small surges on a day-to-day basis while also handling occasional large spikes without without requiring a human to visit the site to replace a self-sacrificing surge protector.
I am whether anyone else has experience using series-mode surge protection devices at repeater sites.? Are there any downsides to these devices?? For example, are the devices prone to failure due to age, heat, moisture, dust, or vermin?
|
Re: International crystal manufacturing
Chuck,
The answer is¡well¡sort of. ?Tradition, longevity and consistency are hallmarks of the telephone company. Roll the calendar back to the 80¡¯s and 90¡¯s and there was EVERYTHING possible in the network. Each had their limitations based on their technology and those limits evaporated as technology went forward. But consistency in dialing HAD to be maintained. ?A phone from a step switch had to work like one off of a new digital switch. So 1+ was the rule and 0+/- for operator assist.
But in direct response, telling the CO switch to set up for a toll call only applied in a mechanical office. The rest of it, shall we say, is all software now and makes absolutely no difference in call processing. ? I am dealing with some databases in northern California where the PUC has mandated no-prefix dialing. ?Not sure why but I imagine it¡¯s to make a wireline phone act like a cellphone. ?Just my guess¡
|
Re: International crystal manufacturing
Also means to do magic with phone numbers and troubleshooting why a call will not go from a to b. I have seen issues where a switch load had mysterious issues in call routing. To the same number some calls you would have to add a 1 and others not. Took an executive escalation to get them to look at it. Took over 24 hours to resolve.
You guys in translations are hidden well.
Stan
toggle quoted message
Show quoted text
On Nov 19, 2022, at 8:23 AM, Joe <k1ike_mail@...> wrote:
?Hello Kevin,
"Sr Translations Engineer" That's a title that I haven't heard in years. I did translations back in the 1980's for the local Telco here in Connecticut. Sometimes interesting, sometimes boring.
(For those curious, translations=software programming in telephone company lingo)
Joe
|
Re: Looking for a PROVEN power supply regulator board design
More details needed, voltage, duty cycle, usage, environment, ect. But a property maintained lead acid battery ('s) floated with a proper power supply is hard to beat.
Ross
On Nov 18, 2022 5:27 PM, Alexandre Souza <alexandre.tabajara@...> wrote: Dear group,
Any recommendationpower supply regulator board circuit which is tested and proven? I would like to build a pair of 30-40A power supplies for a friend and could use some help
Thanks Alexandre, PU2SEX Enviado do meu Tele-Movel
|
Re: Multiple repeaters sharing a common power supply - pros and cons
I will look for it, but no garuntees since I retired 2 years ago and made several moves since then.
|
Re: International crystal manufacturing
Hello Kevin,
"Sr Translations Engineer" That's a title that I haven't heard in years. I did translations back in the 1980's for the local Telco here in Connecticut. Sometimes interesting, sometimes boring.
(For those curious, translations=software programming in telephone company lingo)
Joe
|
Re: International crystal manufacturing
David, you are right.? I posted earlier that the prefix was 00.? That is more common when outside the US.? 011 is correct.? So, for Klove it would be 01131
|
Re: International crystal manufacturing
To access international telephone numbers, the prefix is 00.? For Klove, then, it would be 0031 etc...? At least I think that is right.
Roger
|
Re: International crystal manufacturing
Kevin,
You went way above my pay grade regarding (B). I never worked in the
industry. However, I 'think' my response was the Reader's Digest
version of (B), wasn't it? "seems like it related to telling the
CO to prepare for toll circuit call???"
Yes? No?
Chuck
On 11/19/2022 5:42 AM, Kevin
Magloughlin wrote:
toggle quoted message
Show quoted text
Actually, it is not. ?The digit 1 as a first digit dialed
has/had a double meaning.?
A: 1 means world zone 1. (WZ1) This zone is made up of North
American, Canada and the Caribbean islands. ?So it is not just
the United States. This zone has one aspect in common and that
is they all share the common dialing plan of NPA-NXX+station
digits. (NPA is Number Plan Area or Area Code)
B: in a mechanical switch like a Strowger based or a SC X-Y
switch, meaning non-SPC (stored program control) digit 1 was an
unlock digit. It look only one movement of the mechanical switch
to cut through to a DDD (direct distance dialing) toll trunk and
all subsequent digits were sent to the CAMA (centralized
automatic message accounting) office (AKA toll center or it
could also have been the high side of a local switch) for
billing and the call was completed through the then AT&T
toll network (Pre equal access). ?The reason for this was
everything in the North American Numbering Plan was based on ten
digits and was reflecting the limitation of the #4 crossbar and
its electronic register senders that could only rack 10 digits.
?That¡¯s why there wasn¡¯t IDDD (international direct distance
dialing) until the 1970¡¯s when the #4ESS was deployed.?
Extra extra bonus point question: When looking at an
international phone number dialed from the US, how can you tell
in what World Zone your call terminates?
73
Kevin Magloughlin?
Sr Translations Engineer
CONTEL Hershey NeMAC?
GTE North Telephone Operations?
|
Karl Shoemaker
Chris Boone WB5ITT