VK4ZXI

Agilent 89640 RF VSA (dc to 2.7 GHz) VXI Vector Signal Analyser 89640 RF VSA (dc to 2.7 GHz) comprises: E8491B IEEE-1394 PC Link to VXI, C-Size (FireWire) 89605B RF Input and Calibration Module E1439A 95 MSa/s Digitizer with DSP, Memory and 70MHz IF input E2730A 20-2700 MHz RF Tuner E8408A 4-Slot VXI Mainframe 89601A Vector Signal Analysis Software (I have this running but need option 200) https://www.keysight.com/en/pd-1324099-pn-89601A/vector-signal-analysis-software-node-locked-license?cc=US&lc=eng E9285B Modulation Analysis Software https://www.keysight.com/en/pd-1322627-pn-E9285B/modulation-analysis-software?cc=US&lc=eng https://www.finetopix.com/showthread.php/8226-Agilent-E9285B

Vector Signal Analysis: Agilent 89600 VSA software and E4406A Vector Signal Analyser A very powerful test equipment resource is available with the older versions of the Agilent 89600 Vector Signal Analysis software combined with the E4406A Signal Analyser hardware for DATV and other amateur radio. Version 12 of the Agilent 89600 software is the last that will work with the E4406A hardware. It, and earlier versions, can be accessed at: http://www.home.agilent.com/agilent/editorial.jspx?cc=TW&lc=cht&ckey=1303376&nid=-34704.626687.00&id=1303376 or https://www.keysight.com/main/software.jspx?cc=AU&lc=eng&ckey=1303376&nid=-32400.350722.02&id=1303376 The last version of the 89600 software that will work with the Registry edits for version 10 to 12 to work with E4406A https://community.keysight.com/thread/5127 For 89601B versions https://www.keysight.com/main/software.jspx?cc=AU&lc=eng&nid=-32806.0.02&id=2013472&pageMode=PV...

Variable-length phasing cables for tuning repeater duplexers: Part 2, Using the cable (draft) Introduction In Part 1, a variable-length phasing cable for use in determining duplexer cable lengths, using M/F SMA connectors to vary the length is discussed. In Part 2, this post, I will cover the use of the variable-length phasing cable in more detail. say more?? The basic process The basic process of using a variable-length phasing cable to tune a six cavity duplexer: 1/ Tune each cavity to frequency. 2/ Connect the three cavities with two same length adjustable phasing cables of approximately the right length 3/ Using a spectrum analyser and tracking generator or a vector network analyser (VNA), take out or insert SMA connectors in both cables until the desired response is achieved. 4/ Using a Tee connector between the ports of the instrument, measure the resonate frequency of one of the correct length variable cables as a quarter wave stub. 5/ Cut a length of cable ...

Variable-length phasing cables for tuning repeater duplexers: Part 1, Construction of the cable Introduction A variable-length phasing cable for use in determining duplexer cable lengths, using M/F SMA connectors to vary the length is proposed. It is a cheaper alternative to a set of phasing cables with a 10mm (5mm?) length increment. This post describes the concept and how it can be replicated. A simple idea, but some frustration in execution. The basic process of using the variable-length cables is outlined. The next post will cover the use of the variable length cables and include screenshots from instruments and photos. The problem: determining cable lengths for inter-connecting duplexer cavities Determining cable lengths for inter-connecting duplexer cavities is a perennial topic. Notionally, they are a quarter wavelength or odd multiple, allowing for coax velocity factor, but in practice that is a starting point. My understanding is that commercially, a set of incr...

3D printing or fabricated UHF filters Not crazy idea, being done with antennas. In Jan 2019 QST. Silver conductive paint. Should work for filters. Dimensional stability important with some narrow filters, less so with wideband filters. https://antennatestlab.com/3dprinting https://all3dp.com/1/creality-ender-3-3d-printer-review/ Settings https://www.youtube.com/watch?v=umulfK775i0 https://ultimaker.com/en/products/ultimaker-cura-software https://ultimaker.com/en/resources/50296-which-material-should-i-use Silver coating/paint MG Chemicals Amazon.com https://www.mektronics.com.au/mg-chemicals-super-shieldtm-silver-coated-copper-conductive-coating-ul-recognized-340g.html Fabricated Construct with soldered copper then coat with silver paint. Copper and silver plating https://bryancera.blogspot.com/2014/09/copper-electroplatingforming-3d-prints.html https://www.riogrande.com/category/tools-and-equipment/plating https://janekits.com.au/products/copp...

HP AGILENT 8935 E6380A RF TEST SET Service Monitor for HF and 2 way radio. They all generate AM, FM and have a calibrated output signal generator, have 2 separate audio tone generators, have 2uV sensitive "off the air receivers" with antenna input, encode/decode standard tone (PL) (CTCSS), have sinad, distortion, S/N meters, receive AM, FM and SSB, have modulation / deviation meter, frequency error meters. Overview and screens for HP 8935 E6380A http://www.amtronix.com/e6380a.htm Comparison with other HP test sets http://www.amtronix.com/diff.htm All manuals available through Keysight, just search E6380.

Commercial  DVB-T pass-band/notch filters: What we can learn Introduction Low power, UHF and VHF DVB-T pass-band/notch filters are commercially available at relatively low cost, ~US$750 that seem suitable for DATV. They seem a good off the shelf solution. By examining such filters, it seems possible to see how they might work, giving some insight into possible home-brew. The filters have two notch filters, one for each side of the signal, as per my earlier posts, to notch the TX skirts. In addition, they have cavity pass-band filters to take out artefacts further out. A manufacturer indicates that the pass filter is a combline, but the mechanical construction suggests cavity filters with openings between cavities for coupling. It seems possible to separate the notch and band-pass filters. For wideband UHF, two notch cavities and a pass-band filter. For 2m, two notch cavities and a single pass cavity may suffice. Low-pass filters are still needed for odd harmonics in a...