This is about coax stubs. Sent this earlier to "Towertalk" then I thought perhaps it was better suited to contesting. Reposting, with some edits: I've seen the K2TR stubs, K1TTT page and have recentl
Mike, Sorry .. too little data. I ran into same situation. My solution is now to remove all diodes and transistors from the system. Those I cannot remove, I RF filter with capacitors and ferrites. Bo
Mike, I guess the problem that you are seeing is that when radio A transmits on 40, you can hear interference on 20 and 15, around the harmonic frequencies? I suspect that radio B is being overloaded
Hey Mike, Some great replies to you so far... One other comment I have: You cut the subs based on frequency and velocity factor... I was recounted a story recently about a well-known contester who ha
Mike double-posted this to another reflector, where I referred him to a piece I wrote for the latest NCJ. http://k9yc.com/LocatingStubs.pdf Advice already posted here about looking for leakage and ha
Having extensive experience operating from multioperator stations on the West Coast has given me some insight into interference issues. I can confirm that quite often the source of trouble is not in
what did you use to make the cable length correct? Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 9/8/2015 4:14 PM, Mike Smith VE9AA wrote: Thanks
front end nor finals of the rigs. It can indeed be elsewhere. I second Leigh's statement. Receiver overload and harmonics interference are the easy ones to cure with bandpass filters and/or stubs. I
MIKE!! Just to verify, you are putting a 1/4 wavelength 20m Shorted stub and a 1/4 wavelength 10m Shorted stub in parallel with the coax line at your transmitter while you are transmitting on 40 m, c
OK, Mike, Moving forward: Yes, your 40m 1/4 WL shorted stub on your 40m transmitter should attenuate the 20m transmitted signal. UNLESS, you are not receiving the harmonic from the antenna you are tr
Wondering how those of you using a Six Pack antenna switch hookup your stubs? I have two coax cables from the Six Pack coming into the shack going to each radio. Each station has a multi band Dunesta
Jeff, regarding stubs on six-pack, I place mine on the six individual band ports. A few are "Tee-d" in right at the SO239 on the six pack, but most are connected with a "T" a short distance away. I n
On 80m my Dunestar 600 filters have high SWR higher in the band. I never go above 3.85 MHz so it is not an issue for me. My 20m and 40m beams are close together and in one case they share the same bo
Hey Jeff, I use only tuned stubs for SO2R with my Six Pak. I don't have any other filtering. I connect the stubs on the antenna side coax connectors on the Six Pak with one or more T connectors. Ther
On Tue,9/8/2015 8:23 PM, Jeff Clarke wrote: Wondering how those of you using a Six Pack antenna switch hookup your stubs? I have two coax cables from the Six Pack coming into the shack going to each
Ok distance from the amp, as described below, can make a difference. on the level of blocking harmonics. Now how about on recieve side if you want say youre on 20 and want to block 40, does this dist
On Tue,9/8/2015 9:24 PM, donovanf@starpower.net wrote: That "growly" signals you're hearing are harmonics of your transmitted signal generated by unintentional radiators, especially switching power s
Will and others who suggested putting the stub at the antenna side connectors of your Six Packs.... Are your switch boxes at the top or bottom of your tower or inside the shack? The stubs are actuall
Covered in the app note. 73, Jim K9YC _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.com http://lists.contesting.com/mailman/listinfo/cq-contest
Seems like people who have never done any of this are ahring their views. That is good. People want to share and be in the group. In case you have a problem like should 40m quarter wave resonator's o