# ARRL

## NV2K

 Joined: Tue, May 20th 2014, 01:06 Roles: N/A Moderates: N/A

### Latest Topics

Topic Created Posts Views Last Activity
Which 8-pin DIN for Icom ACC(1)? Feb 22nd 2018, 15:59 1 6,352 on 22/2/18
AA4PB Audio Interface: Any advice? Nov 7th 2015, 19:31 6 9,602 on 6/3/19
Feeding an off-center fed dipole Jul 8th 2015, 23:47 3 5,929 on 9/7/15
Cabrillo template for ARRL DX SSB? Mar 10th 2015, 19:26 3 7,321 on 22/11/16
W6MUR Article on the Z Match? Jan 15th 2015, 23:54 3 7,209 on 16/1/15
ARRL gain scaling definition? Nov 30th 2014, 00:35 4 6,529 on 4/12/14

### Latest Posts

Topic Author Posted On
Which 8-pin DIN for Icom ACC(1)? NV2K on 22/2/18
Several Icom rigs use a pair of DIN connectors for accessories. ACC(1) is an 8-pin DIN connector; ACC(2) is a 7-pin.

Problem is, there are two popular variants of the 8-pin connector: a 262° version and a 270° version. Which one is it? The Icom service manuals do not seem to indicate which it is. Anybody use an aftermarket plug and can tell me which to acquire?

Extra math questions Bobby32955 on 22/2/18
Good on you for asking! I teach Extra upgrade classes, so I have an idea of what is happening here.

How you enter this into your calculator depends on which calculator you have. For most, it is easiest to start with the product of L and C. For that, you should obtain 2.00E-15. Next, take the square root; to three digits this is 4.47E-08. Multiply this by 2π; you'll have 2.81E-07 to three significant digits. Take the reciprocal of this to obtain 3.56E+06, or 3.56 MHz, in agreement with the text.

Remember, you will only see a few questions (likely four) involving computation on the exam. Do not let computational problems stress you out. GL es 73
AA4PB Audio Interface: Any advice? NV2K on 19/12/17
Here's an update: The connection labelled "Line In" is actually the line out, and vice-versa. I do not know what the impact will be of having swapped the primaries and secondaries of the transformers because of this, but suspect it will be small if not non-existent because they are 1:1 and are used for isolation only.

I would like to get the PTT from the right audio channel, as very few computers these days are equipped with a TIA-232 serial interface.
eBabel.net another confirmation process K4WY on 2/3/17
If you wish to try this service, I hope you have better success than I do.

There are no instructions to speak of, the process does not appear to be intuitive, and there are very few users. I have several matched QSLs there, yet no confirmations. I am at a complete loss as to why this is so.

Good luck confirming V43.
Attic Antennas apr1350 on 23/7/16
Without a ton of loading, a wire that fits into the typical attic won't do much on top band, and, agressively loaded, the 2:1 SWR bandwidth will be painfully narrow, and most radiation would be near-vertical. Those who say it won't work might be right -- about 160m. I hope that's not a deal-breaker for you!

Simple wire antennas often pleasantly surprise me. If you can make more than one excursion to the attic, how about hanging a simple dipole for 14MHz as a test? 33 feet, from end to end, with a SO-239 in the middle. Try an A/B comparison with the vertical, keeping in mind that lately there has been a lot of QSB on 20m. This can at least tell you if there's enough metal flashing, chimneys, etc., to keep your signal from getting out.

GL + DX