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Decibel DB4060 Series Duplexers
What would be required to change a DB4060 series can that is currently set up for pass low / block high to pass high / block low? If loop replacement is required, where can they be procured? Thanks! Jeff KC8VFN
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In search of dB4060 -005 coupling loops or assemblies
3
Kevin has given me a lot of help tuning the overpainted and unknown dB4060 diplexer. It is smelling a lot like they are not the ham band model. If anyone has up to date contact info on the firm called duplexerrepair.com I would greatly appreciate it. If anyone has extra -005 coupling assemblies, please let me know, off list. Jerry W6OJE gvlucha@...
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Tait TB8100 CWID Configuration
I've got a TB8100 in GMRS service. I want to of course provide proper ID, but as I share the channel with another system, I do not want the ID to beacon, just politely properly ID routinely after use of the system. In the CWID System tab, pretty sure I do not want Automatic CWID checked - but ID after some period of local system use would be done via a Task Manager configuration? Examples, screen shots welcome.
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Anyone know if this is an okay one for 5 MHz spilt? I need at least 80db of notch (isolation) Supposedly, it's a Moto. I'm shopping for one. -- - Regards, Karl Shoemaker To contact me, please visit SRG's web site at http://www.srgclub.org for the current email address.
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Friends, Please take a look at the attached pictures and see if you can identify the duplexer. it seems like it may be something along the lines of a Decibel Products DB4062-WOC-B. In the Ham VHF repeater band, they seem to have about 1 dB per channel of passband insertion loss and about 75 dB of rejection in the notches. Thoughts? Thanks! Jeff KC8VFN
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I have a cellwave 526-4-2 here and I'm attaching a picture that basically shows the issue. I need to make a whole new harness for it including antenna port harness. Can someone point me in the right direction for harness specs, cable type and length for 440-470 mhz? I need to make the antenna port jumper harness as well as the individual cavity harnesses. Idk what the jackass before me was doing but they butchered the harness. Thanks Robert
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Looking at spare module for the mtr2000 and came across this module and I have no idea what band it is for.
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Varden duplexer model# 8D1146B
3
Hello all, would anyone have any tuning information on the Varden duplexer 146-148mhz. I know its a long shot, but no searches on the web produced any results. These were made by Varden Electronics Box 791, Jackson, Michigan 49204 Thanks for any information
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Anybody have any knowledge or documents to add to the Helper Instruments page ?
I recently had the need to do some research on Helper Instruments and locate a schematic. I ended up overhauling the page at Repeater-Builder. Does anyone know what Bill Detweiler's ham callsign was? It's undoubtedly been reissued... Neither the ARRL or the RCA have that... Does anyone know who the rest of the Helper people were? Or what happened to them? Maybe you have an old business card in the back of a desk drawer? If anyone has the missing applications notes it would be nice if we could offer them for download. If all you have is a paper copy we'd be happy to scan it and return it. The missing ones are: Everything you need to know about SINAD Line Measurements Speed Control System Troubleshooting What the Modulation Monitor Has Missed Troubleshooting With Your Power Supply R.F. Voltmeters Thanks in advance
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UHF mobiles
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Hi, Does anyone know what version 2 UHF radios in the commercial line will operate 440-470 straight through without retuning? I have the TK 8180 which works great in that range, the TK 8302 needs tweaking every couple of MHz. Interested to know what other radios will do this that have a front mounted speaker? ~Thanks, Chad
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TDR for power line
4
Anyone have experience using a TDR to locate an underground fault for high voltage ? There's a PUD in central Washing that can't appear to fix an outage for the past three weeks or so. It's affecting several comm sites and one ski area. It's high up around 7,000 ASL with 20-foot drifts. The road is derivable around the first or second week of July each season. I'm not sure if it's incompetence or lack of training but the concept seems simple enough to me; send a pulse down the line and watch for the return indicating something is wrong. There are several of these units on the market, on line. I also suspect it's not an exact science and requires lots of experience to be effective. If I were in the area I suppose I could hook up the (dead) line to a spark plug circuit (from an engine or whatever) and walk the mile line listening for anomalies with an AM radio. For now, one leasee is dragging large amounts of propane to keep one site alive. -- - Regards, Karl Shoemaker To contact me, please visit SRG's web site at http://www.srgclub.org for the current email address.
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TX Board for Motorola XPR8300 Repeater?
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I am resurrecting an XPR8300. The TX board is scorched. Board #: MOTOTRBO U1-HP 8486777Z14-C UHF Ham Range Does anyone have a parted-out XPR8300 willing to sell the TX board to me? The poor heat-dissipation design makes this a seemingly common ailment. Private message me. Thanks, Steve, N9ATO
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Follow up on KMC 35 Mic Mod for TKX90 Radios
For anyone not reading our original post a little background. The repeater-builder article on the TK690H mentioned that the black KMC35 mic gave better sounding audio than the OEM grey KMC27 mic supplied with the radio. This is noticeably the case, but there seemed to me that a little more highs would be an improvement even on the KMC35 mike replacement, which is the OEM mike supplied with the TK8180 and some other Kenwood mobiles. Therefore I removed chip cap C10 on the mic pc board which works as a low level low pass filter in the 600 ohm mic input to the radio to partially cut off above about 2200-2500 cps. The result was a somewhat improvement in passing some more speech highs, with no noticeable effect on mike lows, so probably worth removing 0.068 uF C10. The comment was made that that should not be necessary as audio was quite good with the KMC35 mike as stock. Then I realized that the TK8180 audio input response is flat to 2800 cps, but only to about 2200-2500 cps on the TK690H radios tested. John
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Improving selectivity on a reciver
7
Hello Everyone, Let me first say this is an experimental improvement to see it will work. I have a hamtronics reciver board that is running in the 220MHZ space. It's one the last board produced before the owner had a fatal bicycle accident. I wanted to see if I could improvement the selectivity of the receiver by narrowing filters or am I look at more of a total redo of the circuit. Like I said, I'm doing this as a experiment. I wanted to narrow it to the current 222-225 Mhz from the old 220 to 225 Mhz. Any suggestions would be helpful. Thanks Steven H. N8RLW
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This is a "For What its Worth" post, but maybe it will have some interest. I hope posting this here does not violate any group rules, but it seems like the appropriate audience. I am clearing out and liquidating a lot of equipment from a closed shop in Las Vegas. Currently I want/need to catalog everything before I start sharing, but in an attempt to save time and shipping expense I am posting the following: I have (2) Db Products VHF Combiner racks, (See attached). They stand about 4' high and about 3' square. (I'm not opposed to parting them out, but initially prefer to see if anyone wants them as a whole). Most of the equipment will most likely be shipped back to the Chicago area to be dealt with, but given the size of these, if anyone is interested in them I would like to know before I screw up the logistics by moving them around. As stated, there will be more later, but I also have a LOT of 220 Combining, (Mostly 5 channel racks, but I will part out if necessary), if anyone is interested. I also have some of the Securicor 220 repeaters with the PA's as has been discussed. If interested give me a reply (Off Group would be best). I am not trying to break anyone's bank on this stuff, but I do have mounting storage and logistical expenses I need to offset, so if anyone is interested, I'm sure we can reach reasonable pricing that benefits both sides. Thanks..... Bob PS, As stated, there is a LOT more stuff available that I need to address in ALL bands, (VHF, 220,UHF, 800 & 900), as well as MANY manuals. If you are looking for anything specific, drop me a line, (Off Group) and I'll let you know if I have it.
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Suggestions for service monitor
15
With SDR being a thing these days, is there any software that could turn say a BladeRF into a capable service monitor for duplexer tuning and alignment? Or any off the shelf solutions which just connect to a computer with USB for operating the service monitor so you don't need the expense of a box with everything in it, similar to the USB oscilloscopes? If not, what is the best bang-for-your-buck ebay-able service monitor that is suitable for most basic service/alignment tasks on repeaters/mobiles/duplexers? Thanks, Mike
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I have this PA and it is labeled “100W PA”. However I cannot find the datasheet for the transistors. Motorola SRF2604. any ideas what the range for this is? drive needed?
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MTR2000 channel steering
8
I'm trying to figure this out. The Moto lit says up to 32 channels and the Wildcard tables show the 96-pin connector GPIOs, but... I don't understand the programming UI. First, is binary channel steering possible without optional cards? Second, does anyone have any explanation of how to do this, perhaps with screenshots? Yes, I can jig up a radio and play, but I'd prefer not to reinvent fire. 73 -de "Curly" John NI0K QRZ.com Hamshack Hotline call me: 6100271
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Begin forwarded message: From: Roger willey <kc4jnn@...> Date: March 26, 2025 at 2:45:40 PM EDT To: [email protected] Subject: 6 m repeater antenna ?I have a 6 m folded dipole antenna, two of them with coaxial lines going to a T what length of cable should I use out of the T to get The impedance and the length? I was thinking maybe 35 Ohm
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kyodo kg510
does anyone have a programming lead for a kyodo kg510 or schematic of one
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