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Search: Posts Made By: tripelo
Forum: Help With Reception 28-Nov-2020, 2:48 PM
Replies: 90
Views: 13,442
Posted By tripelo
Yes, OK. Understood. Thanks.

Yes, OK.



Understood.



Thanks.
Forum: Help With Reception 28-Nov-2020, 12:55 AM
Replies: 90
Views: 13,442
Posted By tripelo
OK, understood. OK, not understood :)...

OK, understood.



OK, not understood :)

Can the Airspy not scan & display a narrow 8-10 MHz region like the RSP1?

When the RSP1 scans from say 45 MHz to 80 MHz,
does the spectrum look...
Forum: Help With Reception 27-Nov-2020, 10:56 PM
Replies: 90
Views: 13,442
Posted By tripelo
Thanks for the images. Looks like displays...

Thanks for the images.

Looks like displays from three different STL-SDR units,
that is if the RTLSDR Scanner is running on one of the lower cost devices?

When comparing the SDRplay and the...
Forum: Help With Reception 27-Nov-2020, 6:50 PM
Replies: 90
Views: 13,442
Posted By tripelo
OK, yes. Not that it would be a serious...

OK, yes.

Not that it would be a serious problem for most antenna testing;

Being a double sideband modulator, doesn't the NTSC video carrier show up twice in the spectrum?



Doesn't the...
Forum: Help With Reception 27-Nov-2020, 2:14 PM
Replies: 90
Views: 13,442
Posted By tripelo
Very good to have cooperation from spouse. ...

Very good to have cooperation from spouse.

Thanks for the .pdf, interesting read.

Wonder how you use the BT double sideband Modulator?

Do you inject a tone to provide a pair of CW signals,...
Forum: Help With Reception 26-Nov-2020, 2:52 PM
Replies: 90
Views: 13,442
Posted By tripelo
Rabbit73, looks like you have a good collection...

Rabbit73, looks like you have a good collection of equipment for portable testing.

Having a near field view over open water helps with signal reception.



That depends on the accuracy one may...
Forum: Help With Reception 25-Nov-2020, 6:44 PM
Replies: 90
Views: 13,442
Posted By tripelo
That would be good if was practical. For...

That would be good if was practical. For accuracy, the two antennas would need to be located at the same physical place. In many cases at UHF, a separation of a foot or so, and the two antenna...
Forum: Help With Reception 25-Nov-2020, 4:43 PM
Replies: 90
Views: 13,442
Posted By tripelo
Yes, in many cases, the graphical images could be...

Yes, in many cases, the graphical images could be helpful.

Having the raw data to analyze, when looking for relatively small performance differences (say between two different antenna preamp...
Forum: Help With Reception 25-Nov-2020, 2:20 PM
Replies: 90
Views: 13,442
Posted By tripelo
Yes, thanks for your thoughts on this topic, that...

Yes, thanks for your thoughts on this topic, that approach could be quite helpful.

Having capability for logging signal quality over longer periods of time (at least 24 hours) would help in...
Forum: Help With Reception 24-Nov-2020, 9:18 PM
Replies: 90
Views: 13,442
Posted By tripelo
Interesting, thanks for the info and images. ...

Interesting, thanks for the info and images.

Seems the Airspy has such a good reputation, that there would be logging/export software available for it.

As we discussed earlier in this thread,...
Forum: Help With Reception 24-Nov-2020, 7:25 PM
Replies: 90
Views: 13,442
Posted By tripelo
Haven't tried it for a couple of reasons: 1....

Haven't tried it for a couple of reasons:

1. Do not yet possess Airspy R2.
2. Haven't seen on Internet where anyone has successfully used the combo.

The reason for Item #2 could be because the...
Forum: Help With Reception 24-Nov-2020, 4:52 PM
Replies: 90
Views: 13,442
Posted By tripelo
Nice list of software, thanks. RTLSDR...

Nice list of software, thanks.

RTLSDR Scanner is shown in the list. Used it several years ago with the least costly version of RTL-SDR dongle. RTLSDR Scanner with its export feature, worked fine...
Forum: Help With Reception 24-Nov-2020, 2:57 PM
Replies: 90
Views: 13,442
Posted By tripelo
Export Data Airspy R2?

Hi rabbit73, or anyone familiar with Airspy.

Do you know if there is software for the Airspy R2 that exports logs of spectrum scans in .csv format (or something similar)?

Interested in software...
Forum: Help With Reception 14-Sep-2020, 4:14 PM
Replies: 90
Views: 13,442
Posted By tripelo
Thanks. That is quite a difference between...

Thanks.

That is quite a difference between your calibrated RSP1a and the Airspy.

.
Forum: Help With Reception 13-Sep-2020, 4:33 PM
Replies: 90
Views: 13,442
Posted By tripelo
Yes. Have noticed that in the low cost...

Yes.



Have noticed that in the low cost RTL devices. Most of the time not a problem if one is aware of their presence.




Interesting.
Forum: Help With Reception 12-Sep-2020, 5:42 PM
Replies: 90
Views: 13,442
Posted By tripelo
Yes, thanks for your response & images/videos. ...

Yes, thanks for your response & images/videos.

As you imply above, for a particular bandwidth,
the number of bits in A/D converter set a limit on dynamic range.

In addition,
linearity of...
Forum: Help With Reception 11-Sep-2020, 4:19 PM
Replies: 90
Views: 13,442
Posted By tripelo
This topic probably could be in another thread. ...

This topic probably could be in another thread.

Would like your thoughts on dynamic range of Airspy vs. SDRplay RSP1.

Rabbit73, do you see differences in instantaneous dynamic between the two...
Forum: Antennas 27-Jul-2020, 1:06 AM
Replies: 1
Views: 4,479
Posted By tripelo
JFD Antenna

Those may be spacers. The front elements are in a Vee array for UHF. The lengths of the UHF elements are 5/4 wavelength or possibly longer. The elements are relatively long for UHF and the spacing...
Forum: Antennas 15-Jun-2020, 6:46 PM
Replies: 33
Views: 6,797
Posted By tripelo
The Twinax is shielded twinlead. Like your 300...

The Twinax is shielded twinlead. Like your 300 Ohm twinlead with a shield. It could be useful in some situations.

It probably could be made to work for a half wave loop balun. but would...
Forum: Antennas 15-Jun-2020, 4:34 PM
Replies: 33
Views: 6,797
Posted By tripelo
Yes The 1st UHF transistor (BFG67)...

Yes



The 1st UHF transistor (BFG67) could be replaced with a BFG520.

It might lower noise figure a couple of tenths of a dB.

Prrobably need to retune.
Forum: Antennas 14-Jun-2020, 8:21 PM
Replies: 33
Views: 6,797
Posted By tripelo
Yes, plus. Channel Master and some other...

Yes, plus.

Channel Master and some other manufacturers have not provided accurate noise figure numbers.

Numbers often provided are quotes from transistor manufacturers specs.

There is more...
Forum: Antennas 12-Jun-2020, 11:18 PM
Replies: 33
Views: 6,797
Posted By tripelo
Yes, looks like it is. It appears L7 is...

Yes, looks like it is.

It appears L7 is meant to move to L7a location for the 0264 version.

Your preamp is probably newer.

.
Forum: Antennas 12-Jun-2020, 11:06 PM
Replies: 33
Views: 6,797
Posted By tripelo
There is no absolute limit relative to length. ...

There is no absolute limit relative to length. Probably way down the coax would have little effect. You will be limited by the length of coax to your preamplifier.

Two ferrites, next to the...
Forum: Antennas 12-Jun-2020, 9:29 PM
Replies: 33
Views: 6,797
Posted By tripelo
The graphs of ferrite impedance look OK for your...

The graphs of ferrite impedance look OK for your application.



They are a form of ceramic, if they bang against each other they crack and separate.



Merry is a good state.
Forum: Antennas 12-Jun-2020, 5:55 PM
Replies: 33
Views: 6,797
Posted By tripelo
CM-0264 Preamp

Seems feasible.

Main item is additional balun.

PCB traces are already there. Need to cut an etch connecting UHF & VHF, etc. Probably have to solder in a small jumper.

Maybe touch up...
Showing results 1 to 25 of 170

 

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