WRTA578

Just scored 500' of this for free to try out with 6 N Connectors hopefully it performs well

I appreciate all the input here on this subject ... my main concern was if stacked or the side by side version was better? one would assume that the side by side may be more efficient of a radiating pattern but i do not know... I had considered many options and I have and are using a Fiberglass antenna at one location it is by far not crap... but I know it is not optimal but was what was in budget 1 year ago.. now that I have help and others wanting to help and contribute I want to move forward to something better.... with a total of 5 repeaters I own all TKR-851's I want to try and fill the gap around NE Iowa and NW Illinois... As for the duplexers the other gentleman pointed me to on Ebay... I sent a message but they are listed at 3Mhz split and while it is a savings will they be as good as TXRX? waiting on his reply if he can tune them and maybe discount if I purchase 5 then it is an option.

I have an ARiUSB 4 radio interface... question 1 will any DB9 to DB25 adapter work hooking to a Kenwood TKR-851? and which PI should I use?

overall I am above all terrain but some spots only 20' above a hill so backside of that area could be affected for an HH but most Mobile or base units shouldn't be affected

This is the duplexer I am ordering and of course using 1/2 Heliax cable and the actual repeaters are Kenwood TKR-851K units UHF Duplexers.pdf

These are the 2 designs both the same yet different just curious which will have the best overall reception... both locations are only 60' towers however one is 810' ASL and other is 799' ASL https://radiogagas.com/categories/nmo-antennas/product/450-470-9db-dipole-n-m?utm_source=google&utm_medium=cpc&gad_source=1&gclid=CjwKCAjwouexBhAuEiwAtW_Zx_Z80fed-bFvnlaFhGYb8xImcbx1NbdvpsMKkU_G3iVjXA_yhTJvXBoC5r4QAvD_BwE https://www.solidsignal.com/commscope-450-470-mhz-3-8-5db-exposed-dipole-omni-antenna-db404-b?utm_source=google&utm_medium=cse&utm_term=DB404-B&gad_source=1&gclid=CjwKCAjwouexBhAuEiwAtW_Zx9hg5oy4aIg5MbkleLk8FhYWNKWZQlE08GBoJmWZtgkr4EiHkRD0rxoCtFIQAvD_BwE

That will work bt being LMR400 and foil wrapped still I wouldn't use it... I would go with a Heliax Cable "All HELIAX coaxial cables are jacketed for direct burial or for corrosive environmental conditions. Standard jacketing material is weather-resistant polyethylene suitable for use in extreme climates."

Thank You for your input.... Tuning a duplexer was something i steered away from for my whole life but thx to Cheap NANOVNA's and You Tube i was able to tackle it... I have 7 repeaters i bought at Gov Auction TKR-851's and all have duplexers I have tuned 2 for 462.6 and 2 for 462.7 so if a failure its a fast cable swap and in goes a whole new repeater.... still waiting on linking hardware so i can link my 2 running repeaters to make my group happy.... now if i could understand how to have 2 repeaters with duplexers on 1 antenna then i could offer to separate systems to my users

I am using a SAA-2N NANOVNA with the Nano VNA app for PC the notches vary from 85ish to 103ish i have tried to get them tighter but i believe my resolution just isnt good enough was just trying to save $200 for tuning from the shop I do like that my S21 was able to get to -0.96 so 1DB loss i assume for transmit and receive which is way better than my Chinese flat pack that is -2.3DB just wondering if you think it will be an improvement over my current installed Chinese Duplexer

First time tuning one on my own so asking the Experts in here is this OK? I know I am not using a 15K piece of equipment to tune it but is this OK as is or should i take it to a radio shop and see if we can deepen the notches more? its an RFS flatpack