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2 votes
1 answer
279 views

Icom 7300 low frequency broad-spectrum noise

14 votes
8 answers
4k views

Why are Wullenweber CDAAs obsolete?

5 votes
1 answer
125 views

What is this vertical antenna with radials pointing up

0 votes
1 answer
79 views

Is 100m too long for hf feed wire?

5 votes
1 answer
1k views

How do I evaluate and use a toroidial core for my HF double-balanced mixer?

7 votes
3 answers
5k views

Is 20m noisy, or do I have a lot of local interference?

2 votes
5 answers
129 views

Garage Door Opener Damaged by HF RF?

3 votes
2 answers
315 views

HF Vertical antenna with no radial and loading coil but only ATU for 80m to 10m in a boat

2 votes
2 answers
203 views

Hi SWR with End Fed HF Wire 9:1 UNUN

6 votes
5 answers
2k views

How important is the impedance and resonance of a receive antenna?

2 votes
0 answers
97 views

What is the best way to ground a whip antenna in a hotel room?

2 votes
0 answers
75 views

What could cause an Icom IC-756 Pro II to suddenly stop transmitting?

1 vote
3 answers
138 views

Why are VHF radios so much cheaper than HF ones?

3 votes
0 answers
54 views

6.765 - 6.795 MHz ISM band for prototype testing

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