Hi Folks: Are there any TS2000X owners out there that have had problems losing the 2sk2685 HEMT front-end on 1.2 GHz? This is the third time I've smoked one at W3KWH during a contest. I'm not sure if
I've run a three-band set of horiz loops for over 6 months now and find them a worthwhile addition to my current station, which is quite modest compared to what I ran 15-20 years ago. Then I had a k
Hi Folks: Anyone out there have an idea what the front-end frequency response curve is like on the TS2000X on 23cm? I need to know how much attenuation it has on 1310 and 1330 MHz, as the nearby airp
Hi Folks: Anyone out there know what the front end bandpass curve is like for the TS2000X on 23CM? I have +10dbm RF spikes from a local airport approach radar at 1310 and 1330 MHz as measured with an
Hi Folks: I put my old ft-290r into beacon mode on 144.300 in en90xn, about a half watt into 2 par loops @ 40' and 1200asl. w3anx in fn00 reports s7 about 25mi away, any reports welcome. Mike WA3TTS
Hi Folks: I have a cw beacon running at 5W ERP in EN90xn. Five watts outpit from amplifier to a pair of PAR loops at 40 feet and 1200 ASL on 144.300 Mhz. I figure the cable, connector, and triplexer
Anyone out there know if there is an article in the amateur microwave literature describing a diplexer for 903 & 1296 or other upper bands? I'm working on some more beacons and being able to use one
Hi Folks: Send W3KWH EN90 vhf test sked requests to wa3tts@verizon.net. Op times 1900Z to 0600Z Sat, 2000Z to 0400Z Sun. I can stay later Sat nite but the Sunday AM window is uncertain. May try WSJT
Hi: My favorite spur-killing trick is to put a 1/8w high ohm resistor (100K+) with one lead cut off and the other lead cut short to form an L-shaped contact. Take a 3 inch piece of heat shrink and sh
Hi Steve & Folks: IMHO there are times when a smaller antenna raised higher is more effective than a lower high-gain antenna when terrian obstructions are present out a few hundred wavelengths. For e
HI All: Years ago N3LL was kind enough to give me a Bird Model 6250 termination milliwatt meter which covers 30-500MHz. That and a few Narda directional couplers provided useful SWR and power measure
Part of this comment is second hand info from K3JRD who built an elecraft 222xvtr for another ham in our area as well as my comments. Jim found some instability in the transmit side of the elecaft 2
Nuking = The tendancy for Mirage amplifiers to break into full power oscillation when presented with an output impedance load of anything other than 49 to 51 ohms resistive. Owned one once. Never aga
For a quick 6M gain antenna I'd try a 2 ele Quad. The 100ohm feedpoint is easy to match with a 1/4 wave piece of RG6 or RG11. I made the spider supports from dowel rods and wood hubs once, but PVC is
Hi all: This became an issue at w3kwh a year or so ago after having repeated failures of the front end HEMT transistor in a TS-2000X on 23cm. In our case, the culprit was the local ATC radar at 1310
Hi Guys: Keep in mind that BPFs won't stop in-band harmonic energy from coming down your coax cable and that is something to be concerned about when a pre-amp device danger zone is -10dbm with close
Hi Folks: On the MMT tx, check all the tx transistors for proper bias voltage (.4 ~ .7 typical on base ), if zero or 12~14 volts that device is likely toast (or no B+ getting to collector). I have se
Tim & Folks: I realized no one answered your IF retune question..... back to 28MHz?) Refer to the appropriate schematics available at http://www.qsl.net/wa2wim/eme/eme.htm which are in a zip folder.
James: I'm not sure if you are going to feed these antennas with a power divider and one coax or separately. At my QTH I have a stack of 144 and 432 MHz beacon antennas about 15~20 feet away from som
Hi Folks: From time to time I've seen some 5 pole 900MHz interdigital filters show up on ebay. They are about 3.5 by 2.5 x 3/4 inch in size and are marked 890-905MHz. The bandpass is very flat and th