[SADXA] New Toys

[Wes]

I'll respond here to both of you (and the group).

After a lot of grief, described previously, Airspy sent a replacement receiver.  
I'm in the preliminary evaluation stages, but it does seem to be improved.

The HF bands seem to survive with only 10 dB of attenuation between the 55' 
vertical and the radio.  On any other antenna it doesn't appear to need any 
additional attenuation.

The lower frequency limit is specified at 0.5 MHz.   I cannot receive the Ryan 
NDB on 338 kHz. Admittedly there is a plethora of computer and switching power 
supply garbage there but my little Sony ICF-SW7600GR receives it Q4.

What I continue to see is confusing performance of the input matching. They make 
a couple of claims that fail to deliver by my measurements.

1) Improved input matching down to virtually DC

2) New High Performance Pre-selector for HF with 4 filter banks (corners at ~DC, 
5, 10, 17 and 31 MHz)

My reading of this is that there are four BPFs with ranges of 0 to 5 MHz, 5 to 
10 MHz, 10 to 17 MHz and 17 to 31 MHz.  I should expect improved matching over 
these ranges, but improved compared to what is unspecified. I would also expect 
that if I tune to a frequency within one of these bands, that is the filter that 
will be selected and I will see a good (but still unspecified) match.  As of 
this writing, I'm not seeing anything like this, but I will continue.  In the 
meantime, caveat emptor.

Wes

On 10/8/2019 12:58 PM, Ron Jones wrote:
> Do you know if there is a broadcast band notch so it could be used on the
> new long wave bands? At  630 and 2200 meters?
>
> Ron K7RJ
>
>
> -----Original Message-----
> From: sadxa-bounces at mailman.qth.net [mailto:sadxa-bounces at mailman.qth.net]
> On Behalf Of KC7ZON
> Sent: Tuesday, October 08, 2019 11:01 AM
> To: 'Southern AZ DX Association E-Mail Reflector'
> Subject: Re: [SADXA] New Toys
>
> I have 2 AM stations in the neighborhood. KUAZ 1550 KHz 50 KW daytime only,
> 3.4 miles away and KVOI 1030 KHz 10/1kw about 1 mile down the road. I can
> see both towers at night.
> On my 80-40 meter may pole I get -4 dBm on the 1030 Khz and -12.4 dBm at
> night, and about +6.5 dBm on the 1500 Khz daylight hours.  This caused a lot
> of problems with my MFJ antenna analyzer working on antennas during the day.
> I use a Morgan systems (ICE) 400X BCB filter and also a MiniKits EME164,
> changes out the 1000 pF caps to 470 pF.
> https://www.minikits.com.au/electronic-kits/filter-kits/hf-highpass-filters/
> HPF11-1M8.
> Also adding about 10 dB of attenuation may help from overload.
>
>