Recent Topics
coaxial cables for satellite frequencies
I previously had a question on rf coaxial cables. Could you explain the frequency compatibility of certain cables like 400, 600 or 1200 series at satellite frequency ranges?
coaxial cables frequency compatibility
In satellite communication, we have the low noise amplifiers (LNA) and the low noise block converters (LNB) at the receiver on the dish. Since, we know an LNA will amplify the weakened satellite signal at the receiver without degrading the SNR value and
rf connector construction materials
Looking at the different options for miniature SMA connectors available, I can see we have gold and silver variants. This is with regards to construction. My reading shows that the contacts can be made of either nickel or gold, I've also seen beryllium
POE output voltages
I have a Netgear switch supporting POE (IEEE 802.3at) on 8 ports. I am unclear on the output voltage levels, is it 48V or 56/57 V? The datasheet clearly shows the power is 30W, but what is the voltage? Seen several unclear and conflicting responses online.
3 pins on a barrel jack
Shopping for a 2.1 x 5.5 mm barrel jack DC connector for a small project I intend to power using a 12VDC 1A power supply. From the images I see 3 pins, does the connector have a grounding contact within the "barrel"? Here's an image: My intention is to
barrel connectors polarity
I'm new to networking and a bit confused about the dc barrel connectors on the power supplies for my devices. I've seen that sometimes the inner or the outer conductors can be positive or negative, depending on how the current flows. Could you explain
D-Link DMS-108 Power Supply
I have the D-Link DMS-108 network switch and I'm in need of a new power supply for it. I have a couple of options but I need some expert help on the pin polarity. Can replacing with a negative or positive pin polarity damage my device?
step-down photocell power taps
For a unit that steps down voltage from 480 to 120VAC, would it supply power to my 110 VAC battery charging system without faults? what is the output range?
No Control Pass Through
For streetlight power taps, can you please explain the 3- pin (no control pass-through). Does that mean that we can not plug a photo cell back on top on this unit to control the street light?
Changing Trane XL1050 Registration from Existing Trane Home Account
I am having a challenge adding my XL1050 thermostat to my Trane Home Network since it is registered to another account. What do I need to register my thermostat?
UTY-XWNX 3-Wire Connector Kit for UTY-RNNYM
I have the ASYG30LMTA indoor unit. My technician has informed me that to install the UTY-RNNYM Remote Controller, a specific connector is required. What is that connector needed?
Emerson 1F89-0211 Thermostat Battery Replacement
How do I change the battery in my Emerson 1F89-0211 thermostat? Does this model come off the wall? Or just the front plate?
VPL24-210 Transformer Replacement
I am having a problem with my add-a-wire box on my furnace which is buzzing. Not sure about the cause but it has been that way since we had a short power outage.
Changing Temperature on Lennox Remote Controller from Celsius to Fahrenheit
I have a Lennox RG10L-WM remote controller. How can I change the temperature reading from Celsius to Fahrenheit?
Mitsubishi Electric MHK1 Connection Issues
I have a Mitsubishi Electric MHK1 thermostat. It says, "No signal wait". I have changed batteries but this does not help. What can I do?
Mitsubishi PAC-US445CN-1 Thermostat Adapter Interface Transformer Setup
I would like to know the amps Mitsubishi PAC-US445CN-1 Thermostat Adapter is pulling. Can I be using several thermostat adapters with only one transformer?
PAC-USWHS002-WF-2 Compatibility
I have a MFZ-KJ18NA indoor unit with the MHK2 wireless thermostat kit. I would like to use a PAC-USWHS002-WF-2 Wi-Fi kit but would like to get clarification on this note in the compatibility document, "Due to the power requirements of the Wireless Interface
Fujitsu UTY-RNNUM Temperature Sensing Range
My Fujitsu indoor unit is ASU24RLF. It's temperature is only controllable down to 60 degrees Fahrenheit. The fan runs at medium speed which is strong and noisy. Not sure if there is a unit that can provide thermostatic and fan control below the 60 d
Carrier TP-PAC01-A Programmable Thermostat Power Requirement
I am not sure whether the Carrier TP-PAC01-A Performance Edge Programmable Thermostat neeeds battery backup. That is a feature I do not need for my thermostat.
LMR cable degradation over time
For the LMR-400 series coax cables, what is the typical time frame I can use my cable for before starting to experience performance degradation? The installation would be in an external environment, so snow, cold, heat and rain are all factors to consider.
Reliable Coaxial Cable
Searching for a high-quality coaxial cable for my cellular antenna. With the different renown brands and even generic variants available, what recommendations would you make? I know of LMR from Times microwave.
Alfa Networks DDC4818
I have the DDC4818 step down adapter and need to know how to wire the input plug - What is the center conductor +48 or -48V?
TC-24B and TE-200 Central Controllers
what is the difference between the M-NET on a TC-24B and the M-NET on a TE-200A?
Venstar T1100RF Thermostat Powering Options
I am not sure whether I can use Alkaline batteries on my T1100RF thermostat. Are there other powering options and how can I increase battery life?
Honeywell Inncom E7 Smart Thermostat Dimming
Is it possible to have the readout on my thermostat dimmed out or can it dim out automatically?
Mr. Cool MTSK02 Wi-Fi Mini Thermostat Powering
I'm looking to buy the Mr. Cool MTSK02 thermostat but I am getting trouble locating a hard-wiring kit or 5V adapter to power the thermostat. Are these the power options that I need and if so how can I get them?
Trane XL824 Wi-Fi Connection Issues
My Trane XL824 thermostat is not connecting to Wi-Fi. It was initially connected but after a brownout there was no connection. What do I do?
UHF and N Connectors performance
Just seen a discussion somewhere on the pros and cons of these two crimp connectors. Is it true that UHF connectors performance deteriorates faster over time since they are not water-proof? For outdoor installations in this case. Also does this imply
POE compatibility
There's unclear guidance on PoE voltage requirements, notably with my TP-Link WA901ND WiFi Access Point, labeled PoE-compatible but without specified voltage needs. It arrives with a 12V adapter and a PoE injector for network cable power supply. What
Fixing Heat Issues using Sensi 1F87U-42WF Smart Thermostat
I have a Sensi Smart thermostat model 1F87U-42WF which is not turning on the heat on my system. What can I do to ensure that the heat is on?
Honeywell T6 Thermostat Battery Replacement
My Honeywell T6 thermostat has a low battery icon on the screen. Which batteries do you recommend I use as replacement and for how longer can the existing batteries last me?
Airzone AZAI6WSPMEL Temperature Unit
Does the Airzone AZAI6WSPMEL support Fahrenheit by default? I have tried other third party CN105 interfaces that do not and it caused issues with setting and viewing the current temperature since it would do an imprecise conversion.
Mitsubishi Electric MHK2 Smart Set Button
My indoor unit model number is MSZ-GL24NA, Service Reference MSZ-GL24NA-U1. I currently have a KM15H remote controller without the Smart Set button, though it has a Wide Vane and Powerful buttons. Would E12T16426 be a direct replacement and how would
Lowering Minimum Heat Setting on MHK2
I have the Mitsubishi Electric MHK2 thermostat and I need help in reducing the minimum heat setting. Any ideas?
Lg LCN098HV4 Indoor Unit Replacement Remote
I have a Ceiling Cassette model number LCN098HV4 whose remote controller seems to be either AKB73757604 or PQWRHQ0FDB. Which among the two would work for me and what is their difference?
How to Set Heat on Honeywell TH4110D1007
How do I program my Honeywell TH4110D1007 thermostat to turn the heat on?
PHTCELTAP alternatives
Hi, we are looking to use photocell power adapter tap ( SKU:PHTCELTAP) for our project. Quick question regarding electrical specification, the input voltage range is 90-480V and output voltage is 120VAC. Does that mean if we install the power tap on 480V
Mitsubishi Electric PAC-USWHS003-TH-1 Sensor Connectivity
I have the Mitsubishi Kumo Cloud PAC-USWHS002-WF-2 Wi-Fi kit for 2 of my indoor units. They are both placed in one room. I am not sure if I can use one Kumo Cloud temperature and humidity sensor for both.
POE Classes
When buying the Aruba Instant On 1930 8G Class4 PoE 2SFP 124W Switch (JL681A) , what's the correlation between these classes and the other 802.11 standards? Kindly, explain. PS! I really appreciate the customer service and technical support available
Aruba Instant On 1930 8G Class4 PoE 2SFP 124W Switch (JL681A)
For the Aruba POE switch mentioned in the title, what is the maximum POE output per port? I can see its rated for a maximum power of 150.2W. My assumption is this total output power should be for the whole switch (so divided among the 8 ports).