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Can this be done with a site sitehawk Sk-4500? If so how?

We have an RF engineer in our club that was able to do this for us,but its' neat to see how it's done.. We've had the same Sinclair 2 meter duplexer since the 1990's , it needed a bit of touchup a couple of years ago ,considering it's been in a block building for 30 + years , it's certainly understandable .. We also used to have a Sinclair 8 bay folded dipole array,which was amazing .... Thanks for showing this ..

Excellent presentation…. Thank you.

Is this for Ham radio?

No mention was made as to the position of the loop to control IL and or reject depth. Also the importance of the proper frequency dependent length of the cabling harness. Good video nevertheless.

Good job

Good job

Nice video other than the music at the beginning and end being 10x louder than the rest.

Sinclair products are excellent. Duplexers are simple to tune. I do not have ant fancy test gear. I use a generator and a receiver to tune at first , then touch up with low power to the inputs hi/low with a watt meter and set to minimum reflected. Have had duplexers checked with an instrument and spot on.. Wish I could own an instrument ...but $$$ which vI do not have. Have also built multicouple sets the same way.. Using a Motorola XPR radio with the RSSI reading as my guide. Can set insertion loss and a wattmeter for reflected .. The loop position is very important !! .... they work..

Can the cable assembly be purchased separately? The cables on my Q3220E are damaged and need to be replaced.

DV Scotland is an independent informal group of radio amateurs, mostly based in Scotland, who share a common interest in Digital / Analogue voice systems. czcams.com/channels/dswor_tH5l_h8zGjqZ9c8g.html

Hammer on it some more

I do not have a VNA so I'm trying to use the SA-TG for this. I understand the lower display of the R&S VNA to be the S21 return loss. I don't quite get how to duplicate the SWR reading of the upper two screens though. I can get a directional coupler but would that require an additional 50ohm load at the T connector when trying to measure the SWR? This would be the directional coupler to the T and instead of a wire back to the VNA as in the video, I terminate it with a 50ohm load. Is that about right?

EXELENTE

If possible send duplexer gavity ckt. of my mail. vu2iwa@gmail.com. I try amd making ur ckt.

I have I bit of a strange case, personally I don't own the richt tools.. however I do own two identical filters, one came tuned by a professional, the otter I want to tune my self. equipment I do have: nanoVNA (cheap Chinese tool) RTL-SDR stick (also cheap Chinese "tool") SWR-power meter (again, cheap Chinese tool) now for the fun-part, I have tuned the filter using the nano-vna, but the dynamic range is poor on those things,.. to get more range u use the nano VNA in CW mode (so It does not sweep, just produce the right frequency) than I use a 10 db attenuator (also cheap Chinese tool) and hook it up to the RTL-SDR and note the exact pont of the signal (frequency and amplitude) note: set the SDR to the smalles sample size since it increases the dynamic range. add one side of the duplex filter and remove the attenuator. now the amplitude of has decreased to the noice floor.... but luckily there is a gain in te RTL-SDR set this to a level you can work with, (not it down) and tweek (very carefully and not by much) the duplexer to minimum deflection! (add gain if needed to allow for signal-noice ratio) use a cheap radio tuned to the right frequency (pass frequentie) and measure SWR (my measurements came to 1.00 :) ) if both sides are done, you'r done. im to CHICKEN to use this duplexer right now, how big is the chance I tuned it completely wrong? I don't want to blow up my repeaters/radio's if anybody has an other cheap way to tune filters I would love to hear it :) 73, PD0HOF / PI1HRN (DMR repeater)

I remember Salourt, my team leader before in this video. Very nice company, superiors are so freindly and accomodating. Hi to Noy my mentor and freind. More power Sinclair Tech.

2 port, 3 channel VNA. Nice to see 2 reflected channels on top and your insertion loss/gain on the 3rd channel at on the bottom. Mine is only 2 ports, 2 channels at a time.

where do you get those soldered T pieces...!!

How old is your analyzer? I see they are for sale on eBay for about $8,000. I saw one for $17,000. That's a lot of money BUT when you need precision there is no other way. www.ebay.com/i/352475893202?chn=ps&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=352475893202&targetid=4580840327039639&device=c&mktype=&googleloc=&poi=&campaignid=301076556&mkgroupid=1235851265215130&rlsatarget=pla-4580840327039639&abcId=1129776&merchantid=51291&msclkid=77411903bcd517b2ee9e47cfedad774b

Can you elaborate more on what we should be trying to see when looking at the smith chart?

I have struggled with cable lengths when tuning duplexers with a tracking generator, (not using a VNA). After tuning a duplexer, if I change the two cables with different lengths, the IFR shows the tuning at different frequencies than first tuned. What is the correct cable lengths used to tune a cavity/duplexer. 300/f x VF x 1/2 wave length?

Basically, these filters are a complete bastard to tune and you're going to be doing it all day and you still won't be happy with the results! :D

It not clear how these things wire up looks like all are parallel. and I den't understand what capacitor tuning does. Can you explain total wiring

This video makes me want to buy Wacom.

I love getting to tune the Sinclair duplexers. I am not in anyway a part of Sinclair so please keep that in mind. Just wanted to say that Sinclair makes a great duplexer!! I have never had a problem in getting it setup perfect!!!!!!!

Do you hawe 600KHz 145.600MHz -600 shift ? and what is the price ?

GOOD TO KNOW. I never seen that kind of T connector.... i used to tune those DECIBEL and Motorola MSF 5000/Qantar duplexer during late 80s to mid 90s I used HP spectrum analyzer and Cushman/Farnell/HP RF signal gen. RF SIGNALGEN IS SET to 0.00 dbm so that I have a direct readind. Initially all rods was set to all up and adjusted one or 2 of the rods until isolation is 90db and other rod to within 3 db insertion loss. I keep on playing also with tuning cap until I got the desired result

Thanks, this video was very informative!

Who is the manufacturer of that "T" connector, also where can one purchase those "T" connectors from?

Nice

Great Video Mike! Question, don't you need to align the circulators on this too? Also you should do a video on circulator theory. I'd love to know more about the internals and the theory of how they are designed.

Thank you. This helped me greatly in understanding the Anritsu SiteMaster and what it was giving me for readings. I had peaked the frequencies not notched.

Mike, The test equipment is a sweep generator and spectrum analyzer?

Do you guys reply to your viewer questions?

How do I tune a Q2330e with a HP 8924c? I don't own a network analyzer.

I wish this video showed a more ordinary test equipment. I don't know what that thing is, but all we use are 2670s with tracking generators...

Great video.