Moon-net July 2021

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88 participants
97 discussions

Re: [Moon-Net] Fwd: 1.5 to 1 watt would get you rainscatter contacts, but your beamwidths0 ghz antenna question

by LoWeb＠esp-inc.net

100 mw. will let you work tropo. 0.5 to 1 watt would get you rainscatter contacts, but your beamwidth will be very narrow, ~1 deg. Ben/K4QFSent from my T-Mobile 4G LTE device------ Original message------From: WB8PFZ via Moon-netDate: Tue, Jul 20, 2021 14:12To: moon-net(a)mailman.pe1itr.com;Cc: Subject:[Moon-Net] Fwd: 10 ghz antenna question -----Original Message----- From: mikflathead(a)aol.com To: moon-net-bounces(a)mailman.pe1itr.com > Sent: Tue, Jul 20, 2021 9:41 am Subject: 10 ghz antenna question How well would this play on 10 ghz? Radio Waves HP4-11G2 1.2 m | 4 ft High Performance Parabolic Reflector Antenna How much power would I need to make contacts? Thanks Mike

1 year, 10 months

432 and Above EME Newsletter for July 2012

by rein0zn＠ix.netcom.com

Hello All, The 432 and above EME newsletter by K2UYH can be found here: http://www.nitehawk.com/rasmit/em70cm.html Tnx Al. 73 Rein W6SZ

1 year, 10 months

Looking for someone to build me a lightweight W2IMU feed for 1296 Mhz EME

by Kurious George

Looking for someone to build me a lightweight (aluminum) W2IMU dual-mode feed for 1296 Mhz EME. This is for a 1.9m RF HAM DESIGN mesh dish, f/D = 0.45. I'm currently using an RA3AQ (2008) feed for 7 dB sun to cold. RX performance is good but looking for very best RX performance as I'm limited to 1.9m dish size. Bill, KB2SA San Diego, CA

1 year, 10 months

Fwd: 10 ghz antenna question

by mikflathead＠aol.com

-----Original Message----- From: mikflathead(a)aol.com To: moon-net-bounces(a)mailman.pe1itr.com <moon-net-bounces(a)mailman.pe1itr.com> Sent: Tue, Jul 20, 2021 9:41 am Subject: 10 ghz antenna question How well would this play on 10 ghz? Radio Waves HP4-11G2 1.2 m | 4 ft High Performance Parabolic Reflector Antenna How much power would I need to make contacts? Thanks Mike

1 year, 10 months

Recent Measurements of IC9700 sensitivity on 144-MHz

by Ed Cole

Recently installed a in-line preamp at the tower to improve Rx sensitivity on 144-MHz (some measurements, below): I installed the preamp using a Dowkey 412 transfer relay (to bypass the preamp in Tx). This has been discussed quite a bit so not repeating any of that discussion. But I was curious the impact on sensitivity on the IC9700 running the internal preamp vs using the tower-mounted preamp. The tower preamp is at ground level (for ease in maintenance for this non-tower climbing person). That means there is significant coax run between the antenna and the preamp input: 12-foot of LMR-400 to the 2-antenna splitter: est loss = 0.18 dB 10-foot LMR-400 jumper around az-el: est loss = 015 dB 30-foot of LMR-600 to ground level: est loss = 0.39 dB 6-foot LMR-400 jumper to preamp: est loss = 0.09 dB total loss = 0.81 dB Preamp NF = 0.16 dB (WA5VJB design mgf-1801 GasFet), 24 dB gain (measured on HP8970B NF meter) System NF (approx) = 0.97 dB (good enough for antennas pointing at horizon for non-eme application) I tested using a Elecraft XG3 signal source radiating at -33 dBm into a VHF "duckie" antenna set on the ground (antenna 45-feet higher). This produced a signal of S7.5 in the IC9700 using the ext. preamp S3.5 with internal preamp Next, I connected the XG3 running -107 dBm plus 30-dB step attenuator plus 10-dB BNC attenuator: -147 dBm signal directly to the ext. preamp input. This produced a S1 signal in the IC9700. No signal was detected running the internal preamp I adjusted attenuation to 23 dB so test signal was -130 dBm Signal with ext preamp was S6 Signal with internal preamp was S1 AGC was not defeated so these are just "numbers" and not necessarily accurate in dB, but I found the 17 dB difference in sensitivity a bit of a surprise. Gain of internal preamp is estimated 10 dB below the gain of the ext. preamp, so sensitivity still shows 7-dB improvement with the external preamp. Using only noise from the yagi antenna: Ext preamp shows about S1 to S2 noise Internal preamp shows S0 This is mainly the gain difference between preamps. next test will be receiving "real" weak signals. 73, Ed - KL7UW

1 year, 10 months

test

by Franco Giorgi

test -- Questa email è stata esaminata alla ricerca di virus da AVG. http://www.avg.com

1 year, 10 months

For Sale

by ON4AOI_PDA

Hi All, due forced expropriation for new harbor I will lose about 2hectare at my remote location including the building where my testlab and shack is located. Due this reason I have to sell a lot. First part more to follow Measurement Equipment all in mint condition except the Tektronics (see below) ================================================================== HP 8752A 300khz-3Ghz Network Analyzer with manual HP 53181A 3Ghz counter HP 8640A Signal Generator HP 5303B 525 Mhz Counter AGILENT E4418B Power meter with ECP-E18A (10Mhz-18Ghz ( -70 to +20dBm) Manual included and 3 directional couplers ((2-70 (40dB/250W) & 23-13 30dB/500W)) Tektronics 2230 100Mhz Digital storage oscilloscope comes with trolley, manual, probes *****Attention (1 entry has a defect or is wrong aligned)******* Fluke 45 Dual Display Multimeter 2 x Lab multimeters G-1002.500 Handheld oscilloscope Velleman HPS50 (in box) Fairchild Type 781A Time-Mark Generator Rohde & Schwarz – LRT BN6100 (inductance meter 0.1uH to 1H) Included is a PC with GPIB -USB -HS connector and 2 GPIB cables Bird model 43 with adjustable Xtractor model 87004 by Coaxial dynamics 43dB Pictures can be asked for. 2.3-2.45 Ghz (Lot 1) ================= 1.9M prime focus dish f/d 0.45 (RFHAMDESIGN) CLX-6 Bracket (RFHAMDESIGN) FPD BR02/3 (RFHAMDESIGN) Septum feed (RFHAMDESIGN) G4DDK preamp (27.2 db / 0.34nf @293K) with Ducommun 2N1A31 coaxrelay/1w dummy) fixed on septum in waterproof box 1 modified amplifier from Siemens S30861 + 200 Watt out with 63mW drive with Power supply, Voltage and current control, blowers etc all in 19” rack 2.3-2.45 Ghz (Lot2) 500 Watt 13 CM Amplifier, This offer contains a do it yourself kit All parts are brand new (except directional coupler) and will be sold in one package. 2 x Siemens S30861 Units (after modification each have +/- 250 Watt out) 2 x W6PQL High current DC Fet switch 2 x W6PQL 13cm Couplers (Rogers 4003) max 500 Watt, 1 x Narda 3042B-30 ( 0.9-2.4Ghz) 30dB coaxial directional coupler (mint condition) 1 x Meanwell SD-1000L-24 PS Input between 19 and 72Volt DC, Out 24-30Volt 40A max, All parts for above like RF resistors, semirigid and connectors included. All paperwork for the modification of amps is included. Pse make fair offer 432 Mhz lot1 =========== 4 x 38 Elem from M2 432-13WLA with splitter , cables, H frame and Tiltplate (see qrz.com) 432 Mhz lot2 =========== 70 CM AMPs (1 lot) 2 x R&S 1.5Kw modified amps type VH 501 A1, R&S 3Fase 400Vac , 3x100Amp @ 30Vdc PS = ok for both All needed blowers included R&S 3db combiner/splitter for input with 100 Watt dummy (port4) R&S Combiner for output , included are the 2 dummy loads from 800 Watt Manual included and more Pse make fair offer = no shipping only pickup due weight HF Beams, Verical and different QRO amplifiers for sale also Guy ON4AOI -OT7K

1 year, 10 months

1296 Stressed Dish fabrication help

by Barry Malowanchuk

Al K2UYH did several presentations on Small Dish EME and he described making small stress portable dish from strips of lumber and mesh. He fastened the mesh petal to each rib so when you place the rib the mesh is already there. I liked the offset version of his dishes and for me a 5 ft offset is quite good on 1296 MHz. Of course bigger is always better and I want to stress the need to use circular polarization with a small antenna in order to get reasonable performance. I will forward one of the presentation separately Best 73 Barry VE4MA

1 year, 10 months

1296 Stressed Dish fabrication help

by Jeff Whisler

All, I am very brand new to EME. On the advice of my Elmer I am considering building a stressed dish in the 4-6 meter range. It needs to be able to disassembled (at least partially) and transported to storage when not in use. I would like to initially use a Yaesu G-5500DC AZ-EL to control the antenna. One of the first considerations I have is what to use for the dish ribs. I am thinking about using fiberglass rods or AL electrical conduit. I am struggling to imagine a way to bend the AL conduit precisely. Seems as though each conduit length would take a different "set" and perhaps be fragile (easily bent) in storage or transportation. Fiberglass rods would need to be attached in a way for easy removal and precise length. How could I do that? Any suggestions on the mechanical fabrication of a stressed dished would be most gratefully received. Hope to CU on the moon. Jeff W9KW -- J Whisler

1 year, 10 months

Vertex 2,4m Vsat-antenna for sale

by SM6CKU

Hello, I still have this antenna and hate to scrap it. It is a very nice 10 or 24 GHz antenna but heavy. Only pick up at my site. If interested let me know and I will send information incl. specs sheet and pictures. 73 de Ben SM6CKU in JO67CK -- Detta e-postmeddelande har sökts igenom efter virus med antivirusprogram från Avast. https://www.avast.com/antivirus

1 year, 10 months

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Moon-net July 2021