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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.

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.

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

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.

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?

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

I am trying to determine the values of variable capacitors in DB Products Low Pass Filters to see if I can convert an 800 Mhz LPF that I bought in a flea market to a 450 Mhz LPF by just changing the inductors between the capacitors. Here is the setup. I bought two DB4333B type low pass filters for 850 Mhz for a very reasonable price. The actual model number listed on the cases is 020252-004. The frequency range is 851-869 Mhz. There are N females on both input and output. Coincidentally, there is not a model number in the Spectra catalog that shows N(F) to N(F). The specific frequency range is also not listed in the catalog, but are wider. I assume this is some kind of OEM model number. It is labeled Decibel. The inductors in the 800 Mhz LPF between the four capacitors are bare, straight, and no turns. I would like to move the cutoff frequency to convert these to the same as a UHF DB4332B to use on an isolator for my amateur UHF repeater. I already have a couple of DB 4332B LPF's for UHF (450 -512 Mhz). The inductors look like 2 1/2 turns on the input and output and 3 1/2 turns between the two inner capacitors. I tried to measure the capacitors in both of these LPF's, but considering the capacitors are in the pf range, it was not that easy to deal with stray capacitances. Does anybody know the capacitor values in the the DB4333-2450 and DB 800 Mhz LPF's? If the capacitors between eh 450 and 800 Mhz are the same value or even close, I should be able to lower the LPF cut-off by increasing the number of turns in the filter to the same number as the DB4332-A. If the capacitors between 450 and 800 Mhz are different, I will just have to cut and try and see what shows up on the spectrum analyzer. I did not want to solder and unsolder inductors to the expensive piston type trimmers and damage them with heat. The wire looks like #12 to me and is covered with shellac in the UHF and plain old copper wire for the 800 Mhz device? I have measured the diameter of the coils in the 450 Mhz LPF and have it written down, someplace? I am just trying to avoid buying additional DB4332B LPF's or equivalent replacement capacitors. That would turn my "reasonable price" into a "not so reasonable price." Thanks. Micheal Salem N5MS

Hi all, I recently just picked up an item from Facebook marketplace, taking the chance on it. It was a roll of unknown coax. The seller took pictures of the roll and the end of the cable. I counted the center conductor stranding, and counted 7. It was silver plated. Having made tons of cable with RG-393, this was my best guess. I reached out and he shipped it to me for $50. Low and behold, I have 230ft of this RG-393. However, it has a braided outer jacket, has a thin layer of what I think is PTFE? separating the outer braided jacket from the shield. There are two silver plated copper shields, then wrapped PTFE? around the center conductor. Does anyone have any info on this cable? Data sheets? Tricks for terminating it? From what I can find out, it was used for military applications. I have attached a few photos of it. Thanks, Joe KC3LMP

I have a few of these LMM 220 amplifiers. I drive it with .05w and it gives me 113W or so output. From the analyzer it looks very clean. Of course these amps were not made for FM. I have seen a few past posts where people would talk about these and several are in use, but there is only one post where someone said to bypass a capacitor to use on fm. No mention what cap he is referring to. For those who are familiar with this amp, enlighten me on your expirence or knowledge. It would be real nice to convert the exciter and receiver to fm! That’s fairyland thinking… 73 WZ5TX