How to make a HW SSB detector with Tayloe detector?

LM

unread,

Jul 25, 2022, 7:05:05 AM7/25/22

to

I found a nice schematic of a Tayloe detector, which would make a nice
HF receiver. http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf
But the Tayloe detector outputs I and Q signals, what about AM or SSB?
I want HW, SDRs are nice but I understand HW and I wont carry a laptop
around.

Rob

unread,

Jul 25, 2022, 7:14:31 AM7/25/22

to

You can use a polyphase network, e.g. as shown here:
http://www.hanssummers.com/polyphase.html

LM

unread,

Jul 25, 2022, 11:49:43 AM7/25/22

to

Thank you, that really seems to have the answer. Tayloe detector has
1-4 outputs and that circuit uses them.

More silly questions, what about AM?

LM

unread,

Jul 25, 2022, 12:40:43 PM7/25/22

to

On Mon, 25 Jul 2022 13:14:28 +0200, Rob <nom...@example.com> wrote:

This looks like it. From the same page.
An Experimental Polyphase Receiver by Bozidar Pasaric 9A2HL, Croatia
http://www.hanssummers.com/gallery4.html
He uses constant resistor values and varies capacitor values. High
tolerance capacitors are more rare that resistors, so I'll use this
calculator. http://rxtx.me/polyphase
Digikey has +- 1% 22nF and others capacitors, I am sure others have
too. TME didn't have suitable values.
This polyphase network may need some optimization.

Rob

unread,

Jul 26, 2022, 5:29:08 AM7/26/22

to

The I or Q outputs already implement sort of AM (actually DSB) detection.
Of course it would be better to have a PLL to lock the VFO frequency
to the AM carrier.

However, it certainly is easier to do everything with SDR.
You do not need a laptop, there are designs that use small computer
boards of the "Raspberry Pi class" to implement a portable SDR receiver.

I have a "Malahit DSP SDR" which is a selfcontained SDR receiver with
a 50 kHz - 2 GHz range doing all modes and with a size smaller than
a small pocket book (including built-in battery). That shows it
certainly can be done.

LM

unread,

Jul 28, 2022, 12:11:24 PM7/28/22

to

On Tue, 26 Jul 2022 11:29:03 +0200, Rob <nom...@example.com> wrote:

>LM <sala...@mail.com> wrote:
>> On Mon, 25 Jul 2022 13:14:28 +0200, Rob <nom...@example.com> wrote:
>>
>>>LM <sala...@mail.com> wrote:
>>>> I found a nice schematic of a Tayloe detector, which would make a nice
>>>> HF receiver. http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf
>>>> But the Tayloe detector outputs I and Q signals, what about AM or SSB?
>>>> I want HW, SDRs are nice but I understand HW and I wont carry a laptop
>>>> around.
>>>
>>>You can use a polyphase network, e.g. as shown here:
>>>http://www.hanssummers.com/polyphase.html
>> Thank you, that really seems to have the answer. Tayloe detector has
>> 1-4 outputs and that circuit uses them.
>>
>> More silly questions, what about AM?
>
>The I or Q outputs already implement sort of AM (actually DSB) detection.
>Of course it would be better to have a PLL to lock the VFO frequency
>to the AM carrier.
>
>However, it certainly is easier to do everything with SDR.

Sure, I have a dongle from SDR-kit.

>You do not need a laptop, there are designs that use small computer
>boards of the "Raspberry Pi class" to implement a portable SDR receiver.
>
>I have a "Malahit DSP SDR" which is a selfcontained SDR receiver with
>a 50 kHz - 2 GHz range doing all modes and with a size smaller than
>a small pocket book (including built-in battery). That shows it
>certainly can be done.

I think I saw DSP software for STM32 chips, and I can build a board
for some them.
But, it is not hard to design a board for a circuit in page 7 here
http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf
For me, digital design or board design is easier than putting foreign
some software to STM32 CPU.