[RFI] Line noise vs Frequency

[Charles Plunk]

I give all the credit for locating my last source to this group 
including the matching the noise source tip. I am archiving all posts on 
this group for future reference. Listening to 30m at this time with s3 
regular old background noise (not including the T Storm crashes :-)).

Chuck

W4NBO

On 8/10/21 1:05 PM, K9MA wrote:
> I've been doing just that for years, and agree completely with Chuck 
> that it's a key. You otherwise will waste your time tracking the wrong 
> sources.
>
> Put the station HF receiver in AM mode, turn the AGC off, reduce RF 
> gain so it doesn't overload, and adjust AF gain so that it doesn't 
> overload the HT.
>
> 73,
> Scott K9MA
>
>
> On 8/10/2021 12:54 PM, Charles Plunk wrote:
>>
>> Sounds like my neighborhood. In locating my last source (a horrible 
>> 20-30 over S9 on 75m), the most significant break through for me was 
>> matching the noise pattern to what I was hearing in my hf receiver. I 
>> accomplished this be retransmitting the hf receivers audio to one ht, 
>> while I df'ed on another ht on 2m AM and a portable 4 element yagi. 
>> With the 2 HT's in tow, when the 2 synced in noise pattern I knew I 
>> was at the correct pole. Next time I may try stereo headphones with 
>> one ht on one ear and the other on the other ear to reduce traffic 
>> noise etc.
>>
>> Prior, I made the big mistake of df'ing for just max noise at the 
>> poles. These 7.2kv lines radiate a strong signal on 2m near almost 
>> every pole (corona?) but that was not what I was hearing on hf. To my 
>> surprise the target source was almost obscured by this noise with the 
>> portable 2m AM. Also, I waited to hunt until the target source had a 
>> distinctive pattern as it tended to vary and even go away with 
>> variances in weather primarily humidity.
>>
>> I also have a FT-817 (actually 2) to df in lower or higher 
>> frequencies as needed. And adding to my portable yagis/ portable 
>> loops as I get time to build them.
>>
>> Chuck
>>
>> W4NBO
>>