* Estimated delivery times start from the date of shipment, excluding processing time.
* Actual delivery times may vary due to holidays, weather conditions, or customs delays.
Envío estándar gratuíto en pedidos superiores a $9.9
Política de devolución
Os artigos devoltos serán aceptados dentro dos 40 días seguintes á data de recepción dos bens. Os artigos personalizados non se poden devolver nin cambiar. Os artigos comprados cunha tarxeta de agasallo electrónica só se poden cambiar; non se aplican reembolsos.
Agasallo gratuíto
Benvido a Roymall, o teu sitio web profesional para a compra de agasallos de tendas de departamento premium. Valoramos e apreciamos moito o teu apoio, e queremos expresar o noso agradecimento engadindo un toque extra de emoción ás túas compras. Cando fas compras connosco, non só podes desfrutar de produtos de alta calidade que melloran o teu estilo de vida, senón que tamén recibirás un agasallo gratuíto exclusivo con cada pedido que realices. Listo para explorar a nosa colección e atopar os teus agasallos perfectos? Navega pola nosa selección de artigos de tendas de departamento premium, fai o teu pedido e espera con ilusión a chegada do teu agasallo gratuíto xunto coa túa compra.
Política de envío
Traballaremos duro para entregarche os artigos despois de recibir os teus pedidos e asegurarnos de que chegan con seguridade. Os detalles de entrega proporcionaranse no teu correo electrónico de confirmación.Na maioría dos casos, os pedidos procésanse en 2 días.En circunstancias especiais, atrasarase do seguinte xeito: Cando realices un pedido o sábado, domingo ou días festivos, atrasarase 2 días..Normalmente, necesítanse 5-7 días laborables (de luns a venres) sen verse afectado por atrasos no voo ou outros factores ambientais..Como o noso servizo de envío é mundial, os tempos de entrega dependerán da túa localización, polo que pode tardar uns cantos días e agarda con paciencia se estás en distritos ou países remotos.
1. Política de devolución e cambio
Só aceptamos artigos comprados en roymall.com. Se compras aos nosos distribuidores locais ou outros minoristas, non podes devolvelos no noso lado.Os artigos de venda final ou agasallos gratuítos non son aceptables para devolución.Para ser elixible para unha devolución, o teu artigo debe estar sen usar e no mesmo estado no que o recibiches. Tamén debe estar no embalaxe orixinal.Despois de recibir as instrucións de devolución de nós, empaqueta os teus artigos devoltos e deixa o teu paquete na oficina de correos local ou noutro mensaxeiro. Procesaremos o teu artigo de devolución ou cambio dentro de 3-5 días laborables despois de recibilo. O reembolso procesarase e acreditarase automaticamente no teu método de pago orixinal.Non se aceptan devolucións nin cambios se o produto foi producido a medida, incluíndo tamaño personalizado, cor personalizada ou impresión personalizada.Necesitas máis axuda, contacta connosco. service@roymall.com ou Whatsapp: +8619359849471
2.Política de reembolso
Recibirás un reembolso completo ou un 100% de crédito na tenda despois de recibir o paquete devolto e comprobalo. O reembolso procesarase e acreditarase automaticamente no teu método de pago orixinal.Ten en conta que os custos de envío e calquera dereito ou taxa non son reembolsables. Os custos de envío extra non son reembolsables unha vez que o paquete foi enviado. Ti es responsable de pagar estas taxas e non podemos renunciar a elas nin reembolsalas, incluso se o pedido volve a nós.Despois de recibir e confirmar o teu artigo devolto, enviarémosche un correo electrónico para notificarte que recibimos o teu artigo devolto. Tamén notificarémosche a aprobación ou rexeitamento do teu reembolso.Se tes algún problema respecto ao proceso de reembolso, contacta connosco. service@roymall.com ou Whatsapp: +8619359849471
Features:
- With DC dimming method, 4" full-view LCD screen can be seen more clearly for outdoor uses, and more comfortable for indoor uses.
- Optimized Electric Bridge: Making full use of the harmonics of Si5351, it can use the 5th harmonic to measure up to 1.5GHz.
- When fundamental wave is used, the output level of CH0 is increased to 0dBm, making reflection measurement more accurate.
- Solved the abnormality of NanoVNA-H when operating at around 6MHz before.
- Redesigned power management circuit reduces power noise, USB power interference, and charging current.
- Improved PCB layout.
- Reserved UART interface for DIY expansion.
- Lightweight ABS shell keeps the device well protected.
-Computer software supports control and real-time display. And it support for exporting snp files for various radio design and simulation software.
- As a measuring device, accuracy is of great importance. Simple calibration parts are included in the package. We have calibrated the product"s dual ports before delivery. When your measurement conditions change (for example, switching from a narrower calibration bandwidth to a wider measurement bandwidth with an extension cable measurement), you need to re-calibrate. After calibration, it is saved as setting 0, which can be used directly at the next boot, or it can be saved to the other 4 saved items through recall when needed.
Parameters:
1. ABS Shell: 75mm x 133mm x 18mm (excluding protrusions)
Really valuable instrument, with lot of options for the price. A single BIG defect, luckily quickly solved googling around: the touch screen responds randomly, sometimes by its own, sometimes not reacting to taps. I discovered that the plastic box is slightly thick and "pushed" the touch screen on the side. Putting four plastic washers between the two halves of the enclosure at the screws and screwing back all, solved the problem.
Really valuable instrument, with lot of options for the price. A single BIG defect, luckily quickly solved googling around: the touch screen responds randomly, sometimes by its own, sometimes not reacting to taps. I discovered that the plastic box is slightly thick and "pushed" the touch screen on the side. Putting four plastic washers between the two halves of the enclosure at the screws and screwing back all, solved the problem.
Really valuable instrument, with lot of options for the price. A single BIG defect, luckily quickly solved googling around: the touch screen responds randomly, sometimes by its own, sometimes not reacting to taps. I discovered that the plastic box is slightly thick and "pushed" the touch screen on the side. Putting four plastic washers between the two halves of the enclosure at the screws and screwing back all, solved the problem.
Shipping is super fast as usual. Packaging is OK, but plastic could not protect the paper box (which is nice, but not very practical).
As I have an older NanoVNA-F I can compare H4 with it.
H4:
Electrically it's better without hesitation. It has no trouble to keep everything below -60dB till 900MHz, and -50dB till almost 1.5GHz. This is really impressive.
It's lighter due to plastic case (I regard this as a positive thing).
LCD size is a bit smaller than F, but as there is no scale it looks almost the same.
LCD visibility (especially from SMA side) is slightly worse than F.
Touch reliability is slightly worse than F.
Pushable rotating knob is still nothing to write home about but it seems to work.
So far I could not locate a new SW version (I mean binary as I'm not keen compiling it myself). In addition the menu cheat sheet contains a DFU menu that is not found on the actual menu of the SW... So it's unclear to me how firmware update supposed to be done if it's necessary.
In overall it's light and electrically so far the best package (it's a very good value). I look forward seeing the V2 variant with a similar size display.
Shipping is super fast as usual. Packaging is OK, but plastic could not protect the paper box (which is nice, but not very practical).
As I have an older NanoVNA-F I can compare H4 with it.
H4:
Electrically it's better without hesitation. It has no trouble to keep everything below -60dB till 900MHz, and -50dB till almost 1.5GHz. This is really impressive.
It's lighter due to plastic case (I regard this as a positive thing).
LCD size is a bit smaller than F, but as there is no scale it looks almost the same.
LCD visibility (especially from SMA side) is slightly worse than F.
Touch reliability is slightly worse than F.
Pushable rotating knob is still nothing to write home about but it seems to work.
So far I could not locate a new SW version (I mean binary as I'm not keen compiling it myself). In addition the menu cheat sheet contains a DFU menu that is not found on the actual menu of the SW... So it's unclear to me how firmware update supposed to be done if it's necessary.
In overall it's light and electrically so far the best package (it's a very good value). I look forward seeing the V2 variant with a similar size display.
Shipping is super fast as usual. Packaging is OK, but plastic could not protect the paper box (which is nice, but not very practical).
As I have an older NanoVNA-F I can compare H4 with it.
H4:
Electrically it's better without hesitation. It has no trouble to keep everything below -60dB till 900MHz, and -50dB till almost 1.5GHz. This is really impressive.
It's lighter due to plastic case (I regard this as a positive thing).
LCD size is a bit smaller than F, but as there is no scale it looks almost the same.
LCD visibility (especially from SMA side) is slightly worse than F.
Touch reliability is slightly worse than F.
Pushable rotating knob is still nothing to write home about but it seems to work.
So far I could not locate a new SW version (I mean binary as I'm not keen compiling it myself). In addition the menu cheat sheet contains a DFU menu that is not found on the actual menu of the SW... So it's unclear to me how firmware update supposed to be done if it's necessary.
In overall it's light and electrically so far the best package (it's a very good value). I look forward seeing the V2 variant with a similar size display.
Tips:For questions about your order, place of delivery, product discount, taxation, delivery time, warranty, shipping, payment, exchange rate, and other questions unrelated to the product, please contact customer service.