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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

Hello, Attempting to program a Maxon SM2150. I have software but having a tough time locating a programming cable. The information I find tells me the SM 2000 series requires Maxon SMP 2000 programming cable. I'm prepared to purchase a cable (or borrow). It is my understanding that the prog. cable plugs into the mike socket (RJ). My SM 2150 has a 15 pin connector directly above the +12 VDC wires. Would this be a prog. connection? I have no info on this connector. Having the rear connector confuses things. I'm not certain whether the radio programs thru the mic. connector or the rear connector. If the rear connector is for programming, then the SMP2000 would be an incorrect cable. Hopefully someone will have an answer. Tim AE7TH Vashon Is. Wa.

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

Hello from Michigan! I'm wondering if some folks have an idea of what might be going on here. Equipment: Yaesu DR-2X Glenayre 97 series 250W UHF amp Glenayre 2728 PSU Sinclair preamp with a PA8075 chip. Output split to 8 ports. ASSY 363750, Board 261022 4 can UHF duplexer. Unclear make/model. 1/2" Heliax, N Connectors Polyphaser Diamond 11dBi fiberglass vert I have an amateur band UHF repeater I've been working with exhibiting the following symptoms: Input desense when output amp is turned on, set to 100W. It's being driven at 100W due to power supply current limitations of a single Glenayre 2728. We've turned this off for now and are running the repeater barefoot at medium power (~20W). This resolved this issue. We'd obviously like our 100W back. Now what we have, again with the amp off and disconnected from RF, is that the input is nearly completely gone after significant rain or snow. After the roof of the building dries up from evaporation, the input comes back. There is no water in the antenna, feedline, or connectors after double checking all of this with 24 hours of rainfall. SWR seems to be the same whether the input is functioning or not. I'll attach photos of a NanoVNA sweep taken while the input was not working yesterday. I have someone running down to the site today to attach a regular HT to the antenna directly, bypassing the repeater, duplexer, and preamp. With the input currently down, we'll see whether the HT fares better. Any suggestions would be appreciated. Pic 1: Base of tower, connection to polyphaser. Pic 2: After duplexer Pic 3: After Polyphaser, 60ft of Heliax, but before preamp and duplexer. Input frequency is 442.900.

Are there extender cards or cables to aid in Quantar module troubleshooting and tuning? Other than some content on the W9CR website, which was very useful, I have not been able to find a thing. It seems like I may end up having to use a stripped down Quantar Chassis for this purpose. Thanks! Jeff KC8VFN

Anyone have need for a TxRx Model 89-96-90210 (that last part cracks me up) Preselector for 929-932? Pics attached------------------------------------------------------------------------------ President and CTO - Arcom Controllers Makers of repeater controllers and accessories Phone: (503) 678 6182 https://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave. We offer complete turn-key repeater packages! "We don't just make 'em. We use 'em!" []

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