Date: Mon, 11 Jun 2018 07:29:39 -0700 From: "Richard (Rick) Karlquist" <[email protected]> To: terry burge <[email protected]>, [email protected] Subject: Re: Topband: cutting coax stubs for 80 meter 4-square
On 6/10/2018 8:01 PM, terry burge wrote: > All's well that ends well I'm happy to report. K2AV, Guy suggested I check > the SO-239 on the Rig Experts AA-170 and I found an open solder joint between > the back of the connector and the circuit board. Even with my close in > glasses and a magnifying glass it was hard to be certain. So a little solder > and 'hop-a-long' rides again! It's working. Will check out the coax stub > again to see what the RE reads now. > Terry > KI7M <My AA-55 is a different model than yours, but the instructions have curious warning about not putting too much force on the UHF connector. I am thinking that RE realizes they have a weak mechanical mounting, relying on solder. I think I will revise my advice: 1. Always use a DC block 2. Carefully attach a short flexible coax jumper and leave in place. Calibrate it out. Then connect the DUT to the end of the jumper. No mechanical stress on the UHF. Rick N6RK ## Is there room inside those rig experts units to install a .01 uf disc ceramic cap ?? A 50-100 volt cap would be smaller diameter than a 1 kv cap. There is your DC blocking right there. .01uf = 10,000 PF..which is ample. .01uf = just 8.846 ohms of XC on 1.8 mhz...and WAY less Xc, when on higher freqs.... like 4 ohms on 80m..and 2 ohms on 40m. If a .02 uf cap was used, the XC would be half again. ## On a similar note, re the MFJ-259B. Can a HP filter be used, to kill AM broadcast junk...or will the HP filter screw things up too much ? Jim VE7RF _________________ Topband Reflector Archives - http://www.contesting.com/_topband
