Yes, roger beeps are common on CB and VHF/UHF FM repeaters. Its not a legality issue just not needed for SSB. Allison

#bitx40

Where I stand on loops: Based on design work and in use. Loop antennas are useful either in the wide band receiving only type or tuned transmitting type. They are not close to full size dipoles in per

Alan de G1FXB Jun 1 #69407 I recall you done antenna R&D. Yes, I did for a commercial firm that was biased toward research and specialized designs. EH antennas, based on work and research are a great

N8DAH, Boards are easy for the EBY amp. FARCircuits has them. Its a good design and allwos for getting good performance at higher frequencies. Mine with a little effort does 37W on 10M (1.8W drive) an

ITs cleverly hidden... T1 and R4 and 3/4ths of the bridge the antenna is the other leg. The centertap of the transformer will have zero RF(noise) if the antenna leg has the exact same resistance and r

Bo, I have the Palomar noise bridge unit and its a very useful tool. Worth way more than the price I paid for it (1$ at a flea). Allison

I would ask questions like: What is the DC applied voltage during TX? It sounds low for CW even. For CW I'd expect near 10-12W however if you Power supply is below 12V what you are getting is then goo

#ubitx #ubitx-help

A SWR of 1:1 is easy with a dummy load but as a radiator its efficiency is very poor. Some antennas can be matched to a good SWR and still be poor radiators. SWR is not a measure of antenna effectiven

Radiation pattern of the reference antenna EFHW varies with frequency. Loops however are very predictable and the pattern is well understood and does not change with frequency until it no longer a sma

Iz oos. To get to 50% just make it bigger. The cost is more material and size plus higher Q makes tuning fussy. A 3M diameter will do for 20m and at 40M you need to be about 8m which is getting large.

Jack, Not aimed at you personally that was a general comment on some of the other loop vendors that came from nowhere. After all at this point you not selling anything. If you telling people how to do

Arv, The problem of online RX or for that fact QRSS and WSPR sites is antenna alignment. If you antenna is not "aimed" that way the result is it could have been a long path or worse "off the side". Th

Jack, Not showing off, no one is paying for it. However when someone claims a loop that 1-2db below a EFHW (or a dipole) that's pretty close to saying my 10 year old Tacoma can win at Indy. In short,

Alan de G1FXB, Your correct. any testing and I've done a lot with small loops you need lots of "shield breakers" or choking to remove the COAX shield as a possible secondary coupling making it an unde

Jack, the biggest issue is the 80-10 EFHW has a terrible pattern, broadside at 80m and by 20M its a 4 lobe pattern with 10m its practically endfire. That creates issues and questions for comparison as

The factors in loop efficiency is: Radiation resistance, usually calculated as a Wheeler measurement would require an arena sized room. Typical values are in the range of hundred of milliohms to very

I slapped one together on the bench and used 69mhz filters salvaged out of a really dead TS830 instead of the crystals for the filters. Tweaked the code and works well. Currently I'm experimenting wit

The reality of mobile ops is they antennas used will be inefficient for bands below 20mhz. Reason is loading coils are a required thing to tune out the reactance of a short antenna. There is no way ar

I will start with removing C84 to break the circuit and putting a 1uf in series input to the 2n5109. A ,1uf is sufficient. Also yes to that connecting point. I do not expect any improvement in harmoni

Joe, 43ma no signal (SSB no audio) is about twice as high as desired. Dial that down to 20ma or so. The two specs you quoted have nothing to do with that as a limit or desired as they are the what is