Telewave.io designs and manufactures high quality products for RF networks. It serves wireless system operators, public safety providers, local and state governments, and federal agencies. The company was founded in 1972 and is based in Fremont, California. Telewave.io strives to be the premier supplier of seamless interoperable communication systems that provide security and reliability in mission critical eco-systems for both commercial and military applications worldwide. Telewave.io products are made in the USA and used by more than 7,500 equipment and network manufacturers and government agencies throughout the world.
Thanks for a very informative video. I bought a TRPD 1554 on ebay that was tuned to 158 mhz and 155 on the low side. I had to install 18ph capacitors on the high side to get back the 600 khz split for ham use (as Telewave recommended). However, the notch on both the TX and RX sides was on the higher side. Since I am not in the US, to send the duplexer back to Telewave, I ordered some RG402 cable and made my own coupling loops and was successful getting the notches where I wanted on both sides. When the duplexer was tuned using the Rigol 815TG, I was able to achieve over -75 db at about 1.2db insertion loss per side. However, knowing that reducing insertion loss too much lowers the Q, I chose to settle for 1.5db insertion loss that gave me better Q. Although the final effort seems satisfactory, I am assuming that my inter cavity cables might be cut for higher than the ham band. Can you please tell us the theory behind how to move notches from the low side to the high side and vice versa? Is it dependant on inductance if the loop? At least one other person has asked the same question and an answer will be beneficial to us hobbyists. Thanks Telewave.
Hello good morning. checking the cavity adjustment video, it strikes me that within the adjustment process, the screws that hold the female connector to the cavity are tightened or loosened, my question is: those should not be touched within the readjustment process of the cavities due to changes in frequency?, or if they should be adjusted to achieve an optimal fit?
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Save your money and go with a Bird. We purchased 4 of these and all 4 have failed to power up. Sent in for RMA repair because they needed new batteries and it is a factory-only repair. Took a year to get back and their service is the worst. Needless to say, when we finally got them back they didn't last a month. Absolute junk. DON'T PURCHASE THIS HORRIBLE GARBAGE!!!!
I bought one of these meters April 2020, worked fine for 6 months then failed to power up. Finally had Telewave issue warranty RMA (difficult process)and sent back in Feb2021. More than a year later Telewave still have not fixed it, and mostly ignore my calls and emails for a progress update. Not happy.
I AM THE ENGINEER WHO DEVELOPED LOW PIM ANTENNA'S FOR TELEWAVE ; AND THEN ROBERT BAGHERI GAVE ALL CREDIT FOR MY WORK TO AMIN RIDA ; AND THEN TELEWAVE FIRED ME ; JUST TO COVER IT ALL UP...... TELEWAVE "HAS NO CLUE" HOW TO BUILD LOW PIM ANTENNA'S ; LET ALONE NO CLUE HOW TO BUILD LOW PIP / LIGHTWEIGHT TOP LOADED CO-LINEAR ANTENNA'S.
Thanks for this, it's much appreciated. Any clue as to whether using it below 20 MHz would damage the meter at all? Not bothered about accuracy, just routine deployment as a running check on reflected power. Thanks.
❌ DITTO !! Total waste of HARD-EARNED *DONATED* Funds! (volunteer fire department who maintains its own gear) I love my 44-AP.... revolutionary in the RF service world as no *EXPENSIVE* “slugs” are required. This digital model ended up souring us on Telewave. We sold the meter for 1/3 of what we paid for it AND warned the buyer of everything prior to accepting payment. We USED to purchase Telewave for practically everything RF. Even their folded UHF dipole antennas were semi-“gamechangers” as they can be shipped anywhere without an oversized shipping problem due to the masts normally provided. We were purchasing aluminum pipe locally to use as mounting masts. *AFTER THE DIGITAL METER NIGHTMARE ->> WE COMPLETELY STOPPED USING TELEWAVE... ANTENNAS/ DUPLEXERS / FILTERS / METERS !* (it’s a matter of principle.... b/c their other products are generally fantastic) Bird has a digital metering “solution “, but it is cumbersome/ requires all sorts of parts and modules/ is EXPENSIVE. We were approached by their marketing folk and offered a complimentary donation of a complete digital “package”, BUT there were strings attached. They wanted a review (to publish).. which was perfectly fine and expected.... It was the “INCLUDE TELEWAVE NIGHTMARE DETAILS” that was a problem. It’s never worth the time getting involved in these sorts of industry battles when you are an unpaid volunteer. So... we still need a solution! I’m willing to purchase a device and donate it to the department just to make my daily tasks easier. Anyone have any recommendations? I noted the RigExpert recommendation above, but i’ve always assumed they were more analyzer’s, more than power and reflected power meters and tailored for the amateur/ham community. Thanks.
@@PowderMill I was systems engineer on that program. Much of the layout was shoved down our throats by the designer ; D. Devall ; and Telewave's fake Ph.D engineer not near smart enough to get a grip on this guy. I have the fix for the 44D. Is real simple , but I don't think the current management at Telewave would listen to me..... I even showed them, in the lab, with an oscilloscope what was wrong, and how to fix it...... But I think they threw me out in time , probably just to cover it up.........
I'm making a duplexer set for 147.300Mhz TX and 147.900 RX I want to know if the TX and RX sides are the same, both with capacitor? how to move the notch opposite from the peak? I will appreciate your answer.
Hello, I'm making some duplexers (first time) I want to know if the TX and RX duplexers are the same, I mean they have both in TX and RX side an capacitor? because the RX side is opposite of the TX, how to get that reverse?
Hi Sergio, Think of the duplexer as a Pass High side and a Pass Low side. There is no limitation between TX and RX Side, but rather, a Pass High Frequency side vs Pass Low Frequency side. Connect the TX and RX to match the frequency specified side of the duplexer.
Reading my post above might help if you have bought a used duplexer that was tuned for a higher frequency outside the ham bands. Maybe not, but just a thought
