Hello Everyone: Here are a few photos of the WA3TTS/B antennas.
1-21-2013 Note: I checked at 1830Z and the WA3TTS 50.0685~ MHz beacon is back in service,,,,,73 Mike wa3tts
1-17-2013 Note: The 6 meter beacon is off temporarily, it should be back in service on Monday
(5-25-2010) Attention 6M Beacon Hunters: The WA3TTS/B on 50.068.5~ ison a legacy CH2TV array consisting of three vertically stacked batwing turnstiles (Dielectric Communications TF-3EL Superturnstile), located in EN90xl, about 4.5 miles south of my home QTH. Elevation is about 2,000ft ASL and 1,000ft HAAT with approximately 1W ERP at the antenna. I am very very grateful for access to this facility and thank the station engineer for allowing it to be used for amateur radio beacon service. 73 Mike wa3tts
(6-08-2010) A few photos of the decomissioned CH2-TV radiator doing all the real work are available on page 37 of the June 2010 Steel City ARC Newsletter, available online at http://www.w3kwh.com/newsletters/SCARC-KH-06-2010.pdf Let's just say the station engineer borrowed my beacon for his multi-million dollar antenna system.
(6-09-2010) Installed the power splitter and 90 deg delay line today so the 3 x batwing turnstile array should be omnidirectional. We made the quarter wave lines with an MFJ-259B and then checked the results with an HP8405a vector voltmeter. The power split was off by .3db and the delay line off 2 degrees.
(7-02-2010) First trans-Atlantic report on DX Summit
(7-03-2010) First West Coast report on DX Summit
The single large PAR Loop is on 6 meters (50.069.1~MHz) and a pair of PAR Loops are fed with phasing lines on 2 meters (144.300MHz). A stack of four omni loops are used on 432.322 MHz, built from the Lowe's Loops article in July 2006 QST P 28. I try to keep the 2M and 432MHz beacons at 10W ERP, althougth they wander around some in power output depending upon temperature and wet-vs-dry weather conditions. The six meter beacon runs one-half watt ERP. Triplexers are used on each end of a 75ft run of CNT400 cable to link the antennas to the beacon transmitters with a single feed line. The photo below is looking NW from the SE with my chimney mount yagis visible.
The extra 10~15 feet of height vs the chimney yagis seems to make a large difference in on-air performance for the omni antennas. This photo was taken from the SE looking NW.
Here is my HF Ground Plane Vertical (MFJ-1793) with stubs added for 17 and 10 meters and part of (54uh portion) a 20 Amp broadcast coil for 160M base loading, switched with a vacuum relay. Four 60~65 ft radials with the base at 15 ft above ground level for 160/80/40m.A pair of 16ft radials for 20 &17m. I can also get a conjugate match on 30m with a W2FMI multi-unun and some extra coax in-line. The unun also helps with some QSY on the bands while easily handling legal limit power.
I just recently replaced the coaxial FT43 bead choke with an RG400 teflon coax FT44 (u=500 Fair Rite2644173551 ) binocularcore choke (below). The second FT-44binocular core choke is stranded 8 gauge wire and isolates the radials from the single-point service ground.
I also use a pair of 15'-35'-15' back-to-back EWE antennas for receive on 160 and 80 meters which are oriented NE and SW and strung between trees at the rear of the property lot. A pair of 150~200ft RG6 runs with an A/B switch select the RX antenna direction. These RX antennas work quite well now that I have effective common mode chokes on both ends of each feedline. Each choke on the receive line is a set of three binocular pairs made using Amidon FB-77-1024 Type 77 sleeves and mini 75 ohm cable. One choke is shown below from the A/B switch to my ANC-4 hybrid combiner. I also detune the TX vertical on 160m by switching out the loading coil which makes a noticeable difference on the rx antenna patterns. On 80 meters I switch the 160m GP loading coil in line for TX antenna detuning.
The next photo was taken from the NW looking SE, which shows all the antennas co-existing with the local leaf attenuators.
Sorry for the clutter in the shack, I'm working on some 10GHz projects and have "stuff" lying around everywhere. Hey, if it was clean and picture perfect I'd be an appliance operator!
Here is my 10GHZ transverter which I built largely from surplus equipment.
Briefly, a Frequency West PLL is in the insulation foam in the upper left corner of the transverter. The 10.802GHz output feeds a 3 pole 150MHz wide10.802GHz WR75 post-coupled waveguide filter (machined by K3ZCY to >.001"). The filtered LO output feeds a single-ended 1N23G WR75 waveguide mixer (434MHz I.F.) with a series RFC and 22 ohm resistor to ground for mixer bias.The mixer RF output goes through a 5 pole 150MHz wide 10.368GHz waveguide filter (Thanks again, Ed!) to a circulator for receive and transmit separation. The LO filter-mixer-RF filter combination are similar to the G3JVL waveguide transverter design. Retuned Harris Corp. Ku-band preamps provide the low level receive and transmit amplification. A Harris-Farrion power amplifier provides 250mw output on 10.368GHz.A 10db sma attenuator on the amplifier inputprovides level and impedance matching. A Transco SMA relay and Dow Key DPDT relay do the RF/IF switching. All of the WR-75 transitions were made in the shop and tuned with the HP-141T and HP8620C Sweep Oscillator with the HP86250B RF Plug-Inand a Narda 10db X-band directional coupler. (Note: the 1/4 wave monopoles in the WR-75 transitions are approximately .22 inch tall. Compare that to my 32 foot tall 40m quarter wave groundplane for perspective!) The IF input attenuator was from the W3CCX Pack Rats web sitetechnical notes. The PLL brick was originally on 11.7 GHz and was re-crystalled and the comb filter retuned for 10.802 GHz with an output level of +6dBm. The PLL brick needs an LM337K regulator on the supply line (not installed yet), as you can hear the transverter shift frequency in the video when going from transmit to receive due to the small change in battery supply voltage when the 24V RF/IFrelays were un-powered. A total of 21 contacts were made with 11 stations the first time the completed transverter was used in the field on Sunday Aug 16, 2009. I have to thank KB8VAO, KD0AR, and WA8RJF for allowing me to tag along to Perry, OH for the 10 GHZ contest. I also want to thank all the OH, MI, and Ontario stations (VE3NPB, VE3FHM, VE3SMA,WA8VPD, K8JA, VE3ZV, AA2LY and W8ISS) for the warm sense of group inclusion that came along with the contest QSO exchanges.
I also built and use a second "test" transverter for 10GHz that is essentially a simple G3JVL waveguide transverter with a single 1N23G mixer diode and waveguide filters for 10368MHz and 10224MHz. A Frequency West PLL provides the LO energy. I optimized diode bias level for this simple 10GHz transverter for best receive performance versus optimized transmitted output, so it only generates 3 or 4 microwatts of energy at 10.368GHz. (1000 microwatts = 1 milliwatt). This low power transmit design was intentional to have a second weak signal source for testing and optimizing the first 10GHz transverter. Even though the simple G3JVL transverter has a transmit level some 50 db below the 250mw output of my main 10GHz transverter, it is still capable of long distance communications under the right circumstances. As an example, here is a Youtube video of a 100km 10GHz microwatt power QSO across Lake Erie in the August 21, 2010 ARRL 10GHz Contest with VE3SMA and VE3FHM on 10.368GHz SSB. Keep in mind I am only using a single 1N23G diode as both the receiver and transmitter. The 10GHz horn has about 23dB gain, so I estimate the Effective Radiated Power (ERP) as 600 microwatts (.6 milliwatt). Several seconds into the video you might notice me chuckle when throwing the I.F. transmit/receive switch. That was because Steve, VE3SMA, was still close to pinning the S-meter on my FT-817 I.F. radio with the 20dB I.F. transmit attenuator still in the receive line path.
For the August weekend of the ARRL 2011 10GHz & Up Contest I finally installed an LM337K regulator on the PLL -V line and reduced the -V line to minus 18 Volts. That made a large improvement in PLL stability, both long and short term, and the T/R and IF relays no longer create QSY problems when cycled. Some 10GHz Contest YouTube videos from the Saturday August 20, 2011 are below:
Great to work the rainscatter, including K2YAZ, NE8I, W9NU, WA8RJF, K8WW, etc.
Thanks to all for a great weekend experience!! 73 Mike wa3tts
More to follow. Thanks for looking!
CM Choke Data
3 stack Type77 Bino 9 Turns Per Section
MHz Attn in 50 ohm
Cable approximately 12 ft of 75 ohm Ultra Thin Video Cable (General Electric AV23278 available at Home Depot). One end is a factory F connector. The other end is fitted with an RCA phono to match my ANC-4 hybrid combiner. Ferrites are a set of six type 77 cores (Amidon FB-77-1024) each sized 1.0" OD, .50" ID, and .825" H. Measured with HP-141T and MFJ-259B signal source.
Type 44 CM ChokeFive Turns
MHz Attn (-dB) in 50
If you prefer to think in ohms of equivalent seriesresistance versus attenuation in dB for the 50 ohm pi circuit test measurements, here is the approximate conversion:
Attenuation (-dB) Series Resistance (ohms)
These chokes evolved from bench tinkering after much reading of great articles by insightful individuals such as W1HIS, N4IS, K9YC, ON4UN, & W8JI.
Here are some additional measurements of various ferrite sleeve types (31, 43, 44, 77, etc.) on coax from the May 2009 issue of the Steel City ARC Newsletter (pages 8,9) http://www.w3kwh.com/newsletters/SCARC-KH-05-2009.pdf
Last modified: 2013-01-21 21:08:24, 14775 bytes cached
This user has no active logs